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Table of Contents

Product Overview

Product Overview

This chapter provides physical and functional overviews of the Cisco  7204 router. It contains physical descriptions of the router hardware and major components, and functional descriptions of hardware-related features. Descriptions and examples of software commands are included only when they are necessary for replacing, installing, configuring, or maintaining the router hardware.

The Cisco  7204 is part of the Cisco  7200 series routers, which consists of the 2-slot Cisco  7202, 4-slot Cisco  7204 and Cisco  7204VXR, and 6-slot Cisco  7206 and Cisco  7206VXR. The Cisco  7204 supports multiprotocol, multimedia routing and bridging over a wide variety of LAN and WAN interface types.

Network interfaces reside on port adapters that provide the connection between the router's three Peripheral Component Interconnect (PCI) buses and external networks. The Cisco  7204 has four slots (slot  1 through slot  4) for the port adapters, one slot for an Input/Output (I/O) controller, and one slot for a network processing engine. You can place the port adapters in any of the four available slots.

There are bays for up to two AC-input or DC-input power supplies. The Cisco  7204 will operate with one power supply. While a second power supply is not required, it allows load sharing and increased system availability.

Note The Cisco  7204 does not support a mixture of AC- and DC-input power.

The Cisco  7204 provides the following features:

Physical Description

The front of the Cisco  7204 provides access to an I/O controller and up to four network interface port adapters (see Figure 1-1). The I/O controller contains the following: a local console port for connecting a data terminal (or data terminal equipment [DTE]) and an auxiliary port for connecting a modem (or other data communications equipment [DCE]) or other devices for configuring and managing the router; two Personal Computer Memory Card International Association (PCMCIA) slots for Flash memory cards; an optional Fast Ethernet port. The Fast Ethernet port provides a 100-Mbps connection to the network.

Note The I/O controller is available with or without a Fast Ethernet port. The I/O controller with a Fast Ethernet port is equipped with either a single MII receptacle or an MII receptacle and an RJ-45 receptacle (only one receptacle can be used at a time). Although still supported by Cisco Systems, the I/O controller equipped with the single MII receptacle was discontinued as an orderable product in May 1998.

Figure 1-1: Cisco  7204 Router---Front View


The port adapters installed in the Cisco  7204 are of the same type as those installed on the second-generation Versatile Interface Processors (VIP2s) in the Cisco  7500 series routers, in Cisco 7000 series routers using the 7000 Series Route Switch Processor (RSP7000) and 7000 series Chassis Interface (RSP7000CI), and in the Cisco uBR7200 series routers. The port adapters installed in the Cisco  7204 support OIR. For an explanation of OIR, refer to the section "Online Insertion and Removal" later in this chapter.

Note The I/O controller does not support OIR. You must power down the Cisco  7204 before removing the I/O controller from the router.

Port adapter slots in the Cisco  7204 router are numbered from left to right, beginning with port adapter slot 1 and continuing through port adapter slot 4. Port adapter slot 0 is the Fast Ethernet port on the I/O controller (refer to Figure 1-2).

Note In Figure 1-1 and Figure 1-2, a blank port adapter is installed in the slot  3. To ensure adequate airflow across the port adapters, each port adapter slot must be filled with either a port adapter or a blank port adapter.

Figure 1-2: Port Adapter Slot Numbering


The rear of the Cisco  7204 router provides access to the network processing engine and up to two power supplies (refer to Figure 1-3).


Figure 1-3: Cisco  7204 Router---Rear View


Note The network processing engine does not support OIR. You must power down the Cisco  7204 before removing the network processing engine from the router.

The network processing engine has no external connectors or LEDs. There is a handle for removing and installing the network processing engine and two captive installation screws for securing it to the chassis.

The Cisco  7204 router comes equipped with one 280W AC-input or one 280W DC-input power supply. A fully configured Cisco  7204 router operates with only one installed power supply; however, a second, optional power supply of the same type provides hot-swappable, load-sharing, redundant power. Figure 1-3 shows the rear of a Cisco  7204 router configured with a single AC-input power supply. (A power supply filler plate is installed over the second power supply bay.)

Caution Do not mix power supplies in the Cisco  7204. In dual power supply router configurations, both power supplies must be of the same type (two AC-input power supplies or two DC-input power supplies).

The power supply has the router's main power switch and either an AC-input power receptacle or a hardwired DC-input power cable (depending on the type of installed power supply).

Adjacent to the power supply bays there are two chassis ground receptacles that provide a chassis ground connection for ESD equipment or a two-hole grounding lug (refer to Figure 1-3).

Three internal fans draw cooling air into chassis and across internal components to maintain an acceptable operating temperature. (Refer to Figure 1-3.) The three fans are enclosed in a tray that is located in the subchassis.

Caution To ensure the proper flow of cooling air across the internal components, make sure blank port adapters are installed in unoccupied port adapter slots, and power supply filler plates are installed in unoccupied power supply bays.

The I/O controller, port adapters, power supplies, and network processing engine slide into their respective chassis slots and connect directly to the router's midplane; there are no internal cables to connect. The midplane distributes DC power from the power supplies to the I/O controller, port adapters, fan tray, and network processing engine.

The midplane also identifies OIR of the port adapters, bridges the PCI buses from the port adapters to packet static random-access memory (SRAM) on the network processing engine, arbitrates traffic across the PCI buses, and generates the clock signals for the port adapters on each PCI bus.

The Cisco  7204 operates as either a tabletop or rack-mounted unit. A rack-mount kit is standard equipment included with all Cisco 7204 routers when they are shipped from the factory. The kit provides the hardware needed to mount the router in a standard 19-inch equipment rack or a telco rack. Steps for installing the Cisco  7204 router in an equipment rack are explained in the chapter "Installing the Cisco 7204." If you are not rack-mounting your Cisco  7204, place it on a sturdy tabletop or platform.

A fully configured Cisco  7204, with two installed power supplies and all chassis slots filled, weighs approximately 50 pounds (22.7 kilograms [kg]). For clearance requirements and rack-mount installation considerations, refer to the section "Site Environment" in the chapter "Preparing for Installation."

System Specifications

Table 1-1 lists the Cisco  7204 router physical specifications and power requirements.


Table 1-1: Cisco  7204 Physical Specifications
Description Specification

Midplane

Two primary PCI buses and one secondary PCI bus with an aggregate bandwidth of 600  Mbps1

Dimensions
(H x W x D)

5.25 in. x 16.8 in. x 17 in. (13.34 cm x 42.67 cm x 43.18 cm)

Weight

Chassis fully configured with a network processing engine, I/O controller, 4 port adapters, 2 power supplies, and a fan tray: ~ 50 lb (22.7 kg)

Heat dissipation

370W (1262 Btu2)

AC-input voltage rating

100-240 VAC3 wide input with power factor correction

AC-input current rating

5A4 at 100-240 VAC with the chassis fully configured

AC-input frequency rating

50/60 Hz5

AC-input cable

18 AWG6 three-wire cable, with a three-lead IEC-320 receptacle on the power supply end, and a country-dependent plug on the power source end

DC-output power

280W maximum (with either a single or a dual power supply configuration)

DC-input voltage rating

-48 VDC7 nominal in North America

-60 VDC nominal in the European Community

DC-input current rating

13A at -48 VDC (370W/-48 VDC = 7.7A typical draw)

8A at -60 VDC (370W/-60 VDC = 6.2A typical draw)

DC voltages supplied and maximum, steady-state current ratings

+5.2V @ 30A

+12.2V @ 9A

-12.0V @ 1.5A

+3.5V @ 13A

DC-input cable

In accordance with local and national wiring regulations

Airflow

~80 cfm8

Temperature

32 to 104° F (0 to 40° C) operating; -4 to 149° F (-20 to 65° C) nonoperating

Humidity

10 to 90% noncondensing

Recommended minimum software requirements9

Cisco IOS Release 11.1(17)CA or a later release of Cisco  IOS 11.1 CA
Cisco IOS Release 11.2(12)P or a later release of Cisco  IOS 11.2 P
Cisco IOS Release 11.3(2)T or a later release of Cisco  IOS 11.3 T
Cisco IOS Release 12.0(3)T or a later release of 12.0 T

Standards compliance

  • Compliance

  • Safety

  • EMC

  • NEBS

  • Immunity

CE marking

UL 1950, CSA 22.2 No. 950, EN60950, ACA TS001, AS/NZS 3260, IEC 950

FCC Class A (47 CFR, Part 15), CSA Class A, EN55022 Class B, CISPR22 Class B, VCCI Class B, AS/NRZ 3590 Class B

GR-1089-CORE, GR-63-CORE

IEC-1000-4-2, IEC-1000-4-3, IEC-1000-4-4, IEC-1000-4-5, IEC-1000-4-6, IEC-1000-4-11, IEC 1000-3-2, EN50082-1, EN50082-2

1Mbps = megabits per second.
2Btu = British thermal units.
3VAC = volts alternating current.
4A = amperes.
5Hz = hertz.
6AWG = American Wire Gauge.
7VDC = volts direct current.
8cfm = cubic feet per minute.
9Refer to the Cisco  AS5800 Universal Access Server documentation listed in the section "If You Need More Information" in the chapter "Performing a Basic Configuration of the Cisco 7204" for Cisco  IOS release requirements for the Cisco  AS5800 Universal Access Server.

Note For a chassis footprint, additional dimensions, and clearance requirements for the Cisco  7204 perimeter, refer to the section "Site Requirements" in the chapter "Preparing for Installation."

Field-Replaceable Units

The Cisco  7204 router is easy to service; all its major components are field replaceable units (FRUs). The following Cisco  7204 components are FRUs:

The following sections provide brief overviews of each FRU.

Instructions for removing and replacing FRUs are contained in separate documents. For example, if you need to replace the fan tray in your Cisco  7204 router, refer to the Fan Tray Replacement Instructions document. This document accompanies every fan tray shipped from the factory as a FRU. The document is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO).

For ordering information, contact a customer service representative.

Network Processing Engine

The network processing engine maintains and executes the system management functions for the Cisco  7204 router. The network processing engine also shares the system memory and environmental monitoring functions with the I/O controller.

Note Detailed instructions for removing and replacing the network processing engine are contained in the configuration note Network Processing Engine Replacement Instructions. This configuration note accompanies every network processing engine that is shipped from the factory as a FRU. The configuration note is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO).

The network processing engine is available in four versions: the NPE-100, NPE-150, NPE-200, and NPE-300.

Network processing engines have the same functionality; however, their performance differs because of the microprocessor type and the type of memory for packet data (SRAM and DRAM, or SDRAM) each network processing engine provides.

Note The Cisco  7204 supports all versions of the network processing engine except the NPE-300; therefore, the NPE-300 is not explained in this publication. (The NPE-300 is keyed so that it can only be installed in Cisco  7200 VXR routers.) For information about the NPE-300 and its use in the Cisco  7200 VXR routers, refer to the Cisco  7200 VXR Installation and Configuration Guide publication.

The NPE-100, NPE-150, and NPE-200 consist of the following components:

The network processing engines perform the following system management functions:

Figure 1-4 shows the NPE-100, Figure 1-5 shows the NPE-150, and Figure 1-6 shows the NPE-200.


Figure 1-4: Network Processing Engine---100



Figure 1-5: Network Processing Engine---150



Figure 1-6: Network Processing Engine---200


Table 1-2 lists the network processing engine memory components.


Table 1-2:
Memory Type Size Quantity Description Location

DRAM

32 to 128 MB

2 or 4

16- or 32-MB SIMMs (based on maximum DRAM required)

Bank 0: U18 and U25 or U11 and U251

Bank 1: U4 and U12 or U42 and U522

SRAM3

NPE-150


NPE-200

1 MB


4 MB

8


8

8 chips, each being 128K words x 9 bits wide

8 chips, each being 512K words x 8bits wide

U700 through U703
U800 through U803


U6, U10, U13, U14, U28, U29, U38, and U39

Boot ROM4
(NPE-200 only)

256 KB

1

PLCC-type integrated circuit for the ROM monitor program

Socket U92

Unified cache

512 KB

4

Secondary cache for the R4700 and R5000 RISC processors

NPE-100 and NPE-150

U2, U10, U14, and U26

NPE-200

U16, U9, U109, and U107
1The sockets for bank  0 on the NPE-100 and the NPE-150 are numbered U18 and U25. The same sockets on the NPE-200 are numbered U11 and U25.
2The sockets for bank  1 on the NPE-100 and the NPE-150 are numbered U4 and U12. The same sockets on the NPE-200 are numbered U42 and U52.
3The NPE-100 does not have SRAM.
4ROM = read-only memory.
Network Processing Engine Memory Components (NPE-100, NPE-150, and NPE-200)
Note To prevent DRAM errors and to ensure your system initializes correctly at startup, DRAM bank  0 (socket U18 and U25, or U11 and U25) must contain no fewer than two SIMMs of the same type. You may also install two SIMMs of the same type in bank  1 (socket U4 and U12, or U42 and U52); however, bank 0 must always contain the two largest SIMMs.

Table 1-3 lists the network processing engine factory-installed DRAM configurations and their product numbers.


Table 1-3: DRAM SIMM Configurations (NPE-100, NPE-150, and NPE-200)
Total DRAM DRAM Bank 0 Quantity DRAM Bank 1 Quantity Product Number

32 MB

U18 and U25 or
U11 and U25

2 16-MB SIMMs

U4 and U12 or
U42 and U52

-

MEM-NPE-32MB1

64 MB

U18 and U25 or
U11 and U25

2 32-MB SIMMS

U4 and U12 or
U42 and U52

-

MEM-NPE-64MB1

128 MB

U18 and U25 or
U11 and U25

2 32-MB SIMMs

U4 and U12 or
U42 and U52

2 32-MB SIMMs

MEM-NPE-128MB1

1These products are also available as DRAM upgrades. For example, to upgrade a network processing engine from 32 MB to 64 MB of DRAM, order product number MEM-NPE-32MB=. A 16 MB-option (product number MEM-NPE-16MB=), which consists of two 8-MB SIMMs, is also available from the factory as a DRAM upgrade.

Use the show version command to identify the network processing engine installed in your Cisco  7204 router. The following example shows an installed NPE-150:

Router> show version

Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-J-M), Released Version 11.1(17)CA
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Sun 04-Aug-96 06:00 by rmontino
Image text-base: 0x60010890, data-base: 0x605F0000
    (display text omitted)
cisco 7204 (NPE 150) processor with 12288K/4096K bytes of memory.
R4700 processor, Implementation 33, Revision 1.0 (Level 2 Cache)
Last reset from power-on
Bridging software.
    (display text omitted)

Input/Output Controller

The Input/Output controller shares the system memory functions and the environmental monitoring functions for the Cisco  7204 router with the network processing engine.

Note Detailed instructions for removing and replacing the I/O controller are contained in the configuration note Input/Output Controller Replacement Instructions. This configuration note accompanies every I/O controller that is shipped from the factory as a FRU. The configuration note is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO).

The I/O controller consists of the following components:

Note When you use the I/O controller that is equipped with an MII receptacle and an RJ-45 receptacle, only one receptacle can be configured for use at a time. Although still supported by Cisco Systems, the I/O controller equipped with the single MII receptacle was discontinued as an orderable product in May 1998.

Figure 1-7: I/O Controller---with Fast Ethernet Port (Single MII Receptacle)



Figure 1-8: I/O Controller---with Fast Ethernet Port (MII and RJ-45 Receptacles)



Figure 1-9: I/O Controller---without Fast Ethernet Port


Table 1-4 lists the I/O controller memory components.


Table 1-4:
Memory Type Size Quantity Description Location

Boot ROM

256 KB

1

DIP-type integrated circuit for the ROM monitor program

U20

Flash SIMM

Flash memory card

4 MB

8 to 20 MB

1

Up to 2

Contains the default boot helper image

Contains the default Cisco IOS image

U99

PCMCIA
slot 0 and slot 1

NVRAM

128 KB

1

Nonvolatile EPROM for the system configuration file

U41

I/O Controller Memory Components

Depending on whether the Fast Ethernet port is present, up to five LEDs on the I/O controller faceplate indicate system status; two additional LEDs indicate the status of the Flash memory cards installed in either PCMCIA slot.

Figure 1-10 shows the LEDs on the I/O controller with the Fast Ethernet port that is equipped with a single MII receptacle. Figure 1-11 shows the LEDs on the I/O controller with the Fast Ethernet port that is equipped with an MII receptacle and an RJ-45 receptacle. Figure 1-12 shows the LEDs on the I/O controller without the Fast Ethernet port.
Table 1-5 lists I/O controller LEDs and their functions. To use the LEDs for troubleshooting the I/O controller, refer to the section "Identifying Startup Problems" in the chapter "Troubleshooting the Installation."

A CPU reset button is located next to the IO power OK LED or the auxiliary port on the I/O  controller faceplate. The CPU reset button resets the entire system.

Caution To prevent system errors and problems, use the CPU reset button only at the direction of your service representative.

Figure 1-10: I/O Controller LEDs and CPU Reset Button---with Fast Ethernet
Port (Single MII Receptacle)



Figure 1-11: I/O Controller LEDs and CPU Reset Button---with Fast Ethernet
Port (MII and RJ-45 Receptacles)



Figure 1-12: I/O Controller LEDs and CPU Reset Button---without Fast
Ethernet Port



Table 1-5: I/O Controller LEDs
LED Function

IO Power OK

Indicates that the I/O controller is on and receiving DC power from the router midplane. This LED comes on during a successful router boot and remains on during normal operation of the router.

Enabled

Indicates that the network processing engine and the I/O controller are enabled for operation by the system; however, it does not mean that the Fast Ethernet port on the I/O controller is functional or enabled. This LED comes on during a successful router boot and remains on during normal operation of the router.

FE enable

Indicates that the Fast Ethernet port on the I/O controller is initialized and enabled for operation by the system. This LED comes on after the I/O controller has been enabled and remains on during normal operation of the router.

FE link

Indicates that the Fast Ethernet port on the I/O controller has established a valid link with the network. This LED remains off during normal operation of the router, unless there is an incoming carrier signal.

MII EN

Indicates that the Fast Ethernet port's MII receptacle is initialized and enabled by the system, and configured for operation. This LED comes on after the I/O controller has been enabled and the MII receptacle has been configured as the media type for the Fast Ethernet port (the RJ-45 receptacle is the default media type for the Fast Ethernet port). This LED remains on during normal operation of the router.

RJ45 EN

Indicates that the Fast Ethernet port's RJ-45 receptacle (the default media type for the Fast Ethernet port) is initialized and enabled by the system. This LED comes on after the I/O controller has been enabled and remains on during normal operation of the router.

RJ45 LINK

Indicates that the Fast Ethernet port's RJ-45 receptacle has established a valid link with the network. This LED remains off during normal operation of the router, unless there is an incoming carrier signal.

Slot 0 Slot 1

Goes on to indicate which PCMCIA slot is in use when either slot is being accessed by the system. These LEDs remain off during normal operation of the router.
Note The I/O controller without the Fast Ethernet port does not have the FE enabled LED and the FE link LED. The I/O controller without the Fast Ethernet port and the I/O controller that is equipped with a single MII receptacle do not have the MII enabled, RJ-45 enabled, and RJ-45 Link LEDs.
Note An MII LINK LED is not provided on the I/O controller because the LED is provided on external transceivers that are required for connecting to the MII receptacle on the I/O controller. Refer to the section "Fast Ethernet Connection Equipment" in the chapter "Installing the Cisco 7204" for Fast Ethernet MII connection requirements.

Use the show  diag  0 command to identify the I/O controller (with or without the Fast Ethernet port) installed in your Cisco  7204 router.

Note Slot 0 in Cisco  7200 series routers is always reserved for the Fast Ethernet port on the I/O controller---if present. If the I/O controller without the Fast Ethernet port is installed in your Cisco  7200 series router, the system software will not display output for the show  diag  0 command.
Note Refer to the section "Port Adapter Slot and Logical Interface Numbering," later in this chapter, for information about port adapter slot numbering and logical interface numbering for the Cisco  7204 router.

The following example shows the I/O controller with the Fast Ethernet port that is equipped with an MII receptacle and RJ-45 receptacle:

Router> show diag 0

Slot 0:
        Fast-ethernet on C7200 I/O with MII or RJ45 port adapter, 1 port
        Port adapter is analyzed
        Port adapter insertion time 00:10:42 ago
        Hardware revision 2.0           Board revision A0
        Serial number     3511336       Part number    73-1537-03
        Test history      0x0           RMA number     00-00-00
        EEPROM format version 1
        EEPROM contents (hex):
          0x20: 01 14 02 00 00 35 94 28 49 06 01 03 00 00 00 00
          0x30: 50 0000 00 FF FF FF FF FF FF FF FF FF FF FF FF

The RJ-45 receptacle is the default media type for the I/O controller that is equipped with an MII receptacle and an RJ-45 receptacle. Use the media-type command to change the
I/O  controller's media type and the show interfaces command to verify the change. The following example configures the MII receptacle as the media type for the I/O controller:

Router# config t

Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# int fastethernet 0/0

Router(config-if)# media-type mii

Router(config-if)# no shutdown

Router(config-if)# exit

Router(config)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed

state to up
%LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
Router# sh int fastethernet 0/0

FastEthernet0/0 is administratively up, line protocol is up
    (display text omitted)
  Encapsulation ARPA, loopback not set, keepalive not set, hdx, MII
    (display text omitted)

Use the media-type 100X command to return the media type to the RJ-45 receptacle.

The default transmission mode for the Fast Ethernet port on the I/O controller is half-duplex. Use the full-duplex command to change the Fast Ethernet port's transmission mode and the show interfaces command to verify the change as follows:

Router# config t

Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# int fastethernet 0/0

Router(config-if)# full-duplex

Router(config-if)# no shutdown

Router(config-if)# exit

Router(config)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed

state to up
%LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
Router# sh int fastethernet 0/0

FastEthernet0/0 is administratively up, line protocol is up
    (display text omitted)
  Encapsulation ARPA, loopback not set, keepalive not set, fdx, 
100BaseTX
    (display text omitted)

Use the no full-duplex command to return the Fast Ethernet port on the I/O controller to half-duplex transmission mode.

Port and Service Adapters

The Cisco  7204 is shipped from the factory with up to four installed port adapters and service adapters. Port adapters provide a variety of network media types (based on your order) for the router and service adapters provide hardware-based services (such as data compression and encryption) for the port adapter media types. The port and service adapters connect directly to the router's midplane. Port and service adapters installed in the Cisco  7204 router support OIR.

For a description of OIR, refer to the section "Online Insertion and Removal" later in this chapter. For general instructions about how to replace a port or service adapter, refer to the section "Replacing a Port or Service Adapter" in the chapter "Maintaining the Cisco 7204."

Caution To ensure adequate airflow across the router's port adapters, a port adapter or a blank port adapter must be installed in each port adapter slot.
Note Detailed instructions for removing, replacing, and configuring the port and service adapter types supported by the Cisco  7206 are contained in the configuration note for each port and service adapter. For example, if you plan to replace a PA-A3 enhanced ATM port adapter in your Cisco  7206 router, PA-A3 Enhanced ATM Port Adapter Installation and Configuration. This configuration note accompanies every PA-A3 enhanced ATM port adapter that is shipped from the factory as an installed item in a Cisco  7206 or as a FRU. The configuration note is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO).

Power Supplies

The Cisco  7204 comes equipped with one 280W AC-input power supply or one 280W DC-input power supply. You must order the second power supply separately.

Caution Do not mix power supplies in the Cisco  7204. In dual power supply configurations, both power supplies must be of the same type (two AC-input power supplies or two DC-input power supplies).
Note Detailed instructions for handling and replacing the Cisco  7204 power supplies are contained in the configuration notes 280-Watt AC-Input Power Supply Replacement Instructions and 280-Watt DC-Input Power Supply Replacement Instructions. These configuration notes accompany every 280W AC-input power supply and every 280W DC-input power supply that is shipped from the factory as a FRU. The configuration note is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO).

A handle on the AC and DC power supplies provides a grip point for removing and replacing the power supply. (Figure 1-13 shows the faceplate of the AC-input power supply. Figure 1-14 shows the faceplate of the DC-input power supply.) Two captive installation screws secure the power supply to the chassis and seat the power supply in the router midplane. A power OK LED indicates that the power supply is delivering +5  VDC to the router midplane.

The AC-input power supply has a receptacle for an AC-input power cable. A modular power cable connects the AC-input power supply to the site AC power source. A cable-retention clip secures the power cable to the AC-input power supply.

The DC-input power supply has DC-input power leads that are hardwired to a DC-input terminal block. A cable tie is shipped with each DC-input power supply to secure the leads to the power supply faceplate and provide strain relief for the leads.


Figure 1-13: AC-Input Power Supply



Figure 1-14: DC-Input Power Supply


Caution To ensure adequate airflow across the router's power supplies, a power supply or a power supply filler plate must be installed in each power supply bay. Figure 1-1 shows a Cisco  7204 with an installed power supply filler plate.

Table 1-1 lists the AC-input and DC-input power supply system power specifications, including input voltage and operating frequency ranges.

Note Each AC-input power supply operating at 120 VAC requires a minimum of 5A service. We recommend powering the Cisco  7204 from a 15A receptacle at the power source.
Note Each DC-input power supply operating at -48 VDC in North America requires a minimum of 13A service. Each DC-input power supply operating at -60 VDC in the European Community requires a minimum of 8A service.

This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a listed and certified fuse or circuit breaker, 20A minimum 60 VDC, is used on all current-carrying conductors.

The power OK LED goes off and the power supply will shut itself down when the internal DC voltages exceed allowable tolerances or the internal temperature of the power supply exceeds allowable tolerances. The power supply will remain in a shut down state until it is disconnected and reconnected to the source power, and then restarted with the power switch. The power switch turns the power supply on and starts the system. For a description of power-supply shutdown conditions and thresholds, refer to the section "Environmental Monitoring and Reporting Functions" later in this chapter.

Fan Tray

The fan tray, shown in Figure 1-15, consists of three fans that are enclosed in a metal case. The fan tray is located in the subchassis and receives -12 VDC through a DC power harness that connects directly to the router midplane. You must remove the subchassis to access the fan tray.

Note Detailed instructions for removing and replacing the fan tray and subchassis are contained in the Fan Tray Replacement Instructions document that accompanies every fan tray that is shipped from the factory as a FRU. The document is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO).

Figure 1-15: Cisco  7204 Fan Tray


The fan tray draws cooling air in through the intake vent on the right side of the chassis (when viewing the router from the front), and moves the air across the internal components and out the exhaust vent on the left side of the chassis.

Figure 1-16 shows the air flow through the router.


Figure 1-16: Internal Air Flow---Top View


The left and right sides of the chassis must remain unobstructed to ensure adequate air flow and prevent overheating inside the chassis; we recommend at least three inches of clearance. (See the section "Site Requirements" in the chapter "Preparing for Installation.")

Temperature sensors on the network processing engine and I/O controller monitor the internal air temperature and send warning messages when the internal air temperature approaches a specified threshold. If the internal temperature exceeds the specified threshold, the system environmental monitor shuts down all internal power to prevent equipment damage from excessive heat.

Chassis

The Cisco  7204 chassis, shown in Figure 1-17, has four slots for the port adapters, one slot for the I/O controller, and one bay for the subchassis. To replace the chassis, you must remove all of the internal components, including the subchassis.

Note Because you must remove all the internal components when replacing the chassis, refer to the configuration notes that explain how to remove and replace the internal components. These configuration notes accompany every chassis that is shipped from the factory as a FRU. The configuration notes are also available on the Documentation CD-ROM and on Cisco Connection Online (CCO).

Figure 1-17: Cisco 7204 Chassis


PCMCIA Flash Disks and Flash Memory Cards

The Cisco  7204 supports up to two installed PCMCIA Flash Disks or two Flash memory cards.

Note To avoid potential problems when inserting spare Flash Disks or Flash memory cards in your Cisco  7204, we recommend that you reformat all of your Flash Disks or Flash memory cards on a Cisco  7204 running one of the recommended Cisco  IOS software releases listed in Table 1-1. (Flash Disks should be reformatted with a 12.0 T Cisco  IOS software image.) The chapter "Maintaining the Cisco 7204" contains instructions that explain how to reformat a Flash memory card.

Flash memory (Flash Disks or cards and the Flash SIMM on the I/O controller) allows you to remotely load and store multiple system and boot helper images. You can download a new image over the network and then add the new image to Flash memory or replace existing files. You can also transfer images between Flash Disks or cards and the onboard Flash memory SIMM. You can then boot the router either manually or automatically from any of the stored images. Flash memory can also function as a TFTP server to allow other routers to boot remotely from stored images or copy them into their own Flash memory.

Note For procedures that explain the use of the PCMCIA Flash Disk, refer to the Using the PCMCIA Flash Disk document that accompanies every Flash Disk shipped from the factory.

For procedures that explain how to replace main, Flash, and ROM monitor memory in Cisco  7200 series routers, refer to the Memory Replacement Instructions for the Network Processing Engine and Input/Output Controller document that accompanies every memory option (main, Flash, and ROM monitor) that is shipped from the factory as a FRU.

The preceding documents are also available on the Documentation CD-ROM and on Cisco Connection Online (CCO). Instructions for installing and removing a Flash memory card are also contained in the section "Installing and Removing a Flash Memory Card" in the chapter "Maintaining the Cisco  7204" of this guide.

Table 1-6 lists the Flash memory card options supported by the Cisco  7204.


Table 1-6: Flash Memory Card Options

Memory Size Product Number

16 MB

MEM-I/O-FLC16M1

20 MB

MEM-I/O-FLC20M1

1These products are also available as Flash card upgrades. To order an upgrade, add an equal sign (=) after the product number, for example, MEM-I/O-FLC16M=.

Table 1-7 lists the Flash Disk options supported by the Cisco  7204.


Table 1-7: Flash Disk Options

Memory Size Product Number

40 MB

MEM-I/O-FLD40M1

110 MB

MEM-I/O-FLD110M1

1These products are also available as Flash Disk upgrades. To order an upgrade, add an equal sign (=) after the product number, for example, MEM-I/O-FLD110M=.

Rack-Mount and Cable-Management Kit

The rack-mount and cable-management kit for the Cisco  7204 consists of rack-mount and cable-management brackets that are designed for mounting your router in 19-inch, 4-post or telco-type equipment racks and for relieving strain on port adapter interface cables that are installed on port adapters in the router. The kit is shipped with each Cisco  7204 and is also available as a single FRU.

For detailed instructions about how to install the rack-mount and cable-management brackets on your Cisco  7204, refer to the sections "Rack-Mounting the Cisco 7204" and "General Installation" in the chapter "Installing the Cisco 7204."

Functional Overview

This section provides a functional overview of the Cisco  7204. It describes the numbering and addressing of the port adapters for the router, the environmental monitoring and reporting functions, and online insertion and removal (OIR). These descriptions will help you become familiar with the capabilities of the Cisco  7204 router.

Port Adapter Slot and Logical Interface Numbering

In the Cisco  7204, the port adapter slot number is the chassis slot in which a port or service adapter is installed, while the logical interface number is the physical location of the interface port on a port adapter (service adapters do not have interface ports). Port adapter slots are numbered from 1 through 4; port adapter slot 0 is reserved for the optional Fast Ethernet port on the I/O controller---if present. (Refer to Figure  1-2 for the numbering scheme of the port adapter slots.) The number of logical interfaces depends on the type of port adapter.

The Media Access Control (MAC)-layer or hardware address is a standardized data link layer address that is required for certain network interface types. These addresses are not used by other devices in the network; they are specific and unique to each port. The Cisco  7204 uses a specific method to assign and control the MAC-layer addresses of its port adapters. For a description of the MAC-layer address, see the section "MAC-Layer Address" later in this chapter.

Port adapter slots maintain the same slot number regardless of whether other port or service adapters are installed or removed. However, when you move a port adapter to a different slot, the port adapter's slot number changes to reflect the new slot number.

You can identify port adapter slots by using software commands to display information about a specific port or service adapter or for all port and service adapters in the Cisco  7204. To display information about all port adapter slots, use the show interfaces command. To display information about a specific port adapter slot, use the show interfaces command with the port adapter type and slot number in the format show interfaces (port adapter type and slot number/port number). If you abbreviate the command (sh int) and do not specify port adapter type and slot number (or arguments), the system interprets the command as show interfaces and displays the status of all port adapters and ports.

Following is an example of how the show interfaces command, used without arguments, displays status information (including the physical port adapter number) for each port adapter in a Cisco  7204.

In the following example, most of the status information for each interface is omitted.

Router# sh int

FastEthernet0/0 is administratively up, line protocol is up
	Hardware is DEC21140, address is 0000.0000.0000 (bia 0000.0000.0000)
	Internet address is 1.1.1.3

	MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255

	(display text omitted)
Fddi1/0 is administratively down, line protocol is down
	Hardware is MIF68840_MM, address is 0000.0000.0000 (bia 0000.0000.0000)

	Internet address is 1.1.1.0
	MTU 4470 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255
	(display text omitted)
Ethernet2/0 is administratively up, line protocol is up

	Hardware is AmdP2, address is 0000.0000.0000 (bia 0000.0000.0000)
	Internet address is 1.1.1.7
	MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec, rely 255/255, load 1/255

	(display text omitted)

You can also use arguments such as the interface type (Ethernet, TokenRing, Fddi, and so forth) and the port address (slot/port) to display information about a specific interface only.

The following example shows the display for the first port on the Token Ring port adapter in port adapter slot  3:

Router# sh int tokenring 3/0

TokenRing3/0 is administratively down, line protocol is down
	Hardware is IBM2692, address is 0000.0000.0000 (bia 0000.0000.0000)
	Internet address is 1.1.1.8

	MTU 4464 bytes, BW 1600 Kbit, DLY 630 usec, rely 255/255, load 1/255
	Encapsulation SNAP, loopback not set, keepalive set (10 sec)

	ARP type: SNAP, ARP Timeout 04:00:00
	Ring speed: 16 Mbps
	(display text omitted)

For complete descriptions and instructions for the commands used to configure your Cisco  7204, refer to the Configuration Fundamentals Configuration Guide and Configuration Fundamentals Command Reference publications, which are available on the Documentation CD-ROM or in print.

MAC-Layer Address

LAN interfaces (ports) require unique MAC-layer addresses, also known as hardware addresses. Typically, the MAC address of an interface is stored on a memory component that resides directly on the interface circuitry; however, the OIR feature requires a different method. For a description of OIR, refer to the section "Online Insertion and Removal" later in this chapter.

The OIR feature allows you to remove a port or service adapter and replace it with another identically configured one. If the new port or service adapter matches the adapter you removed, the system immediately brings it on line. In order to allow OIR, an address allocator with a unique MAC addresses is stored in an EEPROM on the router midplane. Each address is reserved for a specific port and slot in the router regardless of whether a port or service adapter resides in that slot. The MAC addresses are assigned to the slots in sequence. The first address is assigned to slot 0, and the last address is assigned to slot 6. This address scheme allows you to remove port and service adapters and insert them into other routers without causing the MAC addresses to move around the network or be assigned to multiple devices.

Note that if the MAC addresses were stored on each port or service adapter, OIR would not function because you could never replace one adapter with an identical one; the MAC addresses would always be different. Also, each time a port or service adapter was replaced, other devices on the network would have to update their data structures with the new address, and, if they did not do so quickly enough, could cause the same MAC address to appear in more than one device at the same time.

Note Storing the MAC addresses for every slot in one central location means the addresses stay with the memory device on which they are stored.

Online Insertion and Removal

All port and service adapters in the Cisco  7204 support online insertion and removal (OIR).This function allows you to install and replace port and service adapters while the router is operating; you do not need to notify the software or shut down the system power. This provides a method that is seamless to end users on the network, maintains all routing information, and ensures session preservation.

The following is a functional description of OIR for background information only; for specific procedures for installing and replacing a port or service adapter in a Cisco  7204 router, refer to the configuration note that was shipped with the port or service adapter hardware.

Caution The network processing engine and the I/O controller are required system components that cannot be removed if the router is operating. Removing the network processing engine or the I/O controller while the router is operating will cause the router to shut down or crash, and might damage or destroy memory files.

Each port and service adapter has a bus connector that connects it to the router's midplane. Each midplane connector has a set of tiered pins in three lengths that send specific signals to the system as they make contact with the port adapter. The system assesses the signals it receives and the order in which it receives them to determine if a port or service adapter is being removed or inserted into the midplane. From these signals, the system determines whether to reinitialize a new interface or shut down a removed interface. For example, when inserting an port adapter, the longest pins make contact with the port adapter first, and the shortest pins make contact last. The system recognizes the signals and the sequence in which it receives them.

When you remove or insert a port or service adapter in a Cisco  7204 router, the midplane pins send signals to notify the system, which then performs as follows:

    1. Rapidly scans the midplane for configuration changes.

    2. Initializes all newly inserted port and service adapters, noting any removed port adapter interfaces and placing them in the administratively shut down state.

    3. Brings all previously configured interfaces on the port adapter back to the state they were in when they were removed (service adapters do not have interfaces). Any newly inserted interfaces are put in the administratively shut down state, as if they were present (but not configured) at boot time. If a similar port adapter type is reinserted into a slot, its ports are configured and brought on line up to the port count of the original port adapter.

Environmental Monitoring and Reporting Functions

Environmental monitoring and reporting functions are controlled by the network processing engine and allow you to maintain normal system operation by identifying and resolving adverse conditions prior to loss of operation. The environmental monitoring functions constantly monitor the internal chassis air temperature and DC supply voltages and currents. Each power supply monitors its own voltage and temperature and shuts itself down if it detects a critical condition within the power supply. If conditions reach shutdown thresholds, the system shuts down to avoid equipment damage from excessive heat. The reporting functions periodically log the values of measured parameters so that you can retrieve them for analysis later, and the reporting functions display warnings on the console if any of the monitored parameters exceed defined thresholds.

Environmental Monitoring

The environmental monitoring functions use four sensors, two on the network processing engine and two on the I/O controller, to monitor the temperature of the cooling air as it moves through the chassis. Table 1-8 lists the temperature thresholds for the processor-monitored levels of a Cisco  7204 router that has an installed NPE-100, NPE-150, or NPE-200.

Note Refer to the Cisco  7200 VXR Installation and Configuration Guide publication for the temperature thresholds and processor-monitored levels of a Cisco  7200 VXR router that has an installed NPE-300. The Cisco  7204 does not support the NPE-300.

Table 1-8: Typical Processor-Monitored Temperature Thresholds
(NPE-100, NPE-150, and NPE-200)
Parameter High Warning High Critical Shutdown

NPE-100 or NPE-200

Chassis inlet

104° F (40° C)

122° F (50° C)

-

Chassis outlet 1

109° F (43° C)

127° F (53° C)

136° F (58° C)

Chassis outlet 2

167° F (75° C)

167° F (75° C)

-

Chassis outlet 3

122° F (50° C)

140° F (60° C)

149° F (65° C)

NPE-150

Chassis inlet

104° F (40° C)

122° F (50° C)

-

Chassis outlet 1

109° F (43° C)

127° F (53° C)

136° F (58° C)

Chassis outlet 2

167° F (75° C)

167° F (75° C)

-

Chassis outlet 3

131° F (55° C)

149° F (65° C)

158° F (70° C)

Table 1-9 lists the DC power thresholds for the normal, warning, and critical (power  supply-monitored) levels.


Table 1-9: Typical Power Supply-Monitored DC-Voltage Thresholds
Parameter Low Critical Low Warning High Warning High Critical

+3.45V

+3.26V

+3.34V

+3.55V

+3.63V

+5.15V

+4.86V

+4.99V

+5.31V

+5.43V

+12.15V

+11.39V

+11.67

+12.62V

+12.91V

-11.95V

-9.52V

-10.73

-13.16V

-14.38V

If the air temperature exceeds a defined threshold, the system controller displays warning messages on the console terminal and, if the temperature exceeds the shutdown threshold, it shuts down the system. The system stores the present parameter measurements for both temperature and DC voltage in NVRAM, so that you can retrieve them later as a report of the last shutdown parameters.

The power supplies monitor internal power supply temperature and voltages. A power supply is either within tolerance (Normal) or out of tolerance (Critical), as shown in Table 1-9. If an internal power supply temperature or voltage reaches a critical level, the power supply shuts down without any interaction with the system processor.

Reporting Functions

The Cisco  7204 displays warning messages on the console if chassis interface-monitored parameters exceed a defined threshold. You can also retrieve and display environmental status reports with the show environment, show environment all, show environment last, and show environment table commands. Parameters are measured and reporting functions are updated every 60 seconds. A brief description of each of these commands follows.

Note Refer to the Cisco  7200 VXR Installation and Configuration Guide publication for sample outputs of the show environment, show environment all, show environment last, and show environment table commands from a Cisco  7200 VXR router that has an installed NPE-300. The Cisco  7204 does not support the NPE-300.
Caution To prevent overheating the chassis, ensure that your system is drawing cool inlet air. Overtemperature conditions can occur if the system is drawing in the exhaust air of other equipment. Ensure adequate clearance around the sides of the chassis so that cooling air can flow through the chassis interior unimpeded and exhaust air exits the chassis and is not drawn into the inlet vent of other device.

The show environment command display reports the current environmental status of the system. The report displays parameters that are out of the normal values. No parameters are displayed if the system status is normal. The example that follows shows the display for a system in which all monitored parameters are within normal range:

Router# show env

All measured values are normal

If the environmental status is not normal, the system reports the worst-case status level. Following is an example overvoltage warning:

Router# show env

Warning: +3.45 V measured at +3.83 V

The show environment last command retrieves and displays the NVRAM log, which shows the reason for the last system shutdown (if the shutdown was related to voltage or temperature) and the environmental status at that time. Air temperature is measured and displayed, and the DC voltage supplied by the power supply is also displayed.

Following is sample output of the show  env last command:

Router# show env last

Temperature readings:
	chassis inlet previously measured at 27C/80F
	chassis outlet 1 previously measured at 31C/87F
	chassis outlet 2 previously measured at 37C/98F 
	chassis outlet 3 previously measured at 45C/113F
Voltage readings:
	+3.45 V previously measured at +3.51 V 
	+5.2 V  previously measured at +5.19 V 
	+12.2 V previously measured at +12.42 V 
	-12.2 V previously measured at -12.14 V 
Reason for last shutdown:
	power supply

The show environment table command displays the temperature and voltage thresholds for each temperature sensor and for each monitored status level, which are related to those thresholds listed in Table 1-8 and Table 1-9. The display also lists the shutdown threshold for the system.

Following is sample output of the sh  env  table command for a Cisco  7204 that has an installed NPE-150:

Router# show env table

Sample Point      LowCritical    LowWarning     HighWarning    
HighCritical
chassis inlet                                   40C/104F       50C/122F
chassis outlet 1                                43C/109F       53C/127F
chassis outlet 2                                75C/167F       75C/167F
chassis outlet 3                                55C/131F       65C/149F
+3.45 V           +3.26          +3.34          +3.55          +3.63
+5.15 V           +4.86          +4.99          +5.31          +5.43
+12.15 V          +11.39         +11.67         +12.62         +12.91
-11.95 V          -9.52          -10.73         -13.16         -14.38
System shutdown for chassis outlet 1 58C/136F
System shutdown for chassis outlet 3 70C/158F

Following is sample output of the sh  env  table command for a Cisco  7204 that has an installed NPE-100 or NPE-200:

Router# show env table

Sample Point      LowCritical    LowWarning     HighWarning    
HighCritical
chassis inlet                                   40C/104F       50C/122F
chassis outlet 1                                43C/109F       53C/127F
chassis outlet 2                                75C/167F       75C/167F
chassis outlet 3                                50C/122F       60C/140F
+3.45 V           +3.26          +3.34          +3.55          +3.63
+5.15 V           +4.86          +4.99          +5.31          +5.43
+12.15 V          +11.39         +11.67         +12.62         +12.91
-11.95 V          -9.52          -10.73         -13.16         -14.38
System shutdown for chassis outlet 1 58C/136F
System shutdown for chassis outlet 3 65C/149F
Note Temperature ranges and values are subject to change.

The show environment all command displays an extended report that includes temperature readings and voltage readings. The show environment all command also displays a report showing which power supply slots are occupied and which are empty.

Following is sample output of the sh env all command:

Router# show env all

Power Supplies:
	Power supply 1 is Zytek AC Power Supply. Unit is on.
	Power supply 2 is Zytek AC Power Supply. Unit is on. 
Temperature readings:
	chassis inlet    measured at 47C/116F:Temperature in Warning range!
	chassis outlet 1 measured at 49C/120F:Temperature in Warning range!
	chassis outlet 2 measured at 55C/131F 
	chassis outlet 3 measured at 58C/136F:Temperature in Warning range!
Voltage readings:
	+3.45 V  measured at +3.51 V 
	+5.2 V  measured at +5.19 V 
	+12.2 V measured at +12.42 V 
	-12.2 V measured at -12.14 V

Fan Failures

When the system power is on, all three fans should be operational. The system will continue to operate if a fan fails; however, if the air temperature exceeds a defined threshold, the system controller displays warning messages on the console terminal and, if the temperature exceeds the shut down threshold, it shuts down the system.

If the system does shutdown because the temperature exceeded the shutdown threshold, the system will display the following message on the console screen and in the environment display when the system restarts:

Queued messages:
%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown

For complete descriptions and instructions of the environmental monitor commands, refer to the Configuration Fundamentals Configuration Guide and Configuration Fundamentals Command Reference publications, which are available on the Documentation CD-ROM and on Cisco Connection Online (CCO), or in print.


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