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This chapter describes the tasks you must perform before you begin to install the Cisco 2500 series multiport serial routers. It includes the following sections:
Follow these guidelines to ensure general safety:
Follow these guidelines when working on equipment powered by electricity.
 | Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or can weld the metal object to the terminals. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
| Warning Read the installation instructions before you connect the system to its power source. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when electronic components are improperly handled and can result in complete or intermittent failures.
Always follow ESD-prevention procedures when removing and replacing components. Ensure that the chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to safely channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the metal part of the chassis.
 | Caution For safety, periodically check the resistance value of the antistatic strap, which should be between 1 and 10 megohms. |
This section describes the requirements your site must meet for safe installation and operation of your system. Ensure that your site is properly prepared before beginning installation.
The multiport serial routers can be placed on a desktop or mounted in a rack or on a wall.
| Warning Ultimate disposal of this product should be handled according to all national laws and regulations. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
The location of individual chassis and the layout of your equipment rack or wiring room are extremely important for proper system operation. Equipment placed too close together, inadequate ventilation, and inaccessible panels can cause system malfunctions and shutdowns, and can make system maintenance difficult.
When planning your site layout and equipment locations, keep in mind the precautions described in the next section, "Preventive Site Configuration," to help avoid equipment failures and reduce the possibility of environmentally caused shutdowns. If you are currently experiencing shutdowns or unusually high errors with your existing equipment, these precautions may help you isolate the cause of failures and prevent future problems.
The following precautions will help you plan an acceptable operating environment for your multiport serial router and will help you avoid environmentally caused equipment failures:
The following tips will help you plan an acceptable equipment rack configuration:
Check the power at your site to ensure that you are receiving "clean" power (free of spikes and noise). Install a power conditioner if necessary.
| Warning The device is designed to work with TN power systems. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
The multiport serial router power supply includes the following features:
| Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S. (240 VAC, 10A international) is used on the phase conductors (all current-carrying conductors). (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
The multiport serial routers run system code from Flash memory single in-line memory modules (SIMMs). With the proper system code image, the multiport serial router can also run from dynamic random-access memory (DRAM); however, this operation requires a 4-MB memory upgrade (installation of a 1 MB x 36 DRAM SIMM). In addition, operating system code from DRAM can result in a 25 percent decrease in system performance.
Operating the system code from Flash memory is the default and is recommended for optimum performance of the multiport serial routers.
The Installation Checklist lists the procedures for initial hardware installation of a new multiport serial router. Make a copy of this checklist and mark the entries as you complete each procedure. Include a copy of the checklist for each system in your Site Log. (See the following section, "Creating a Site Log.")
Installation checklist for site______________________________________________ | ||
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Router name__________________________________________________________
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| Task | Verified by | Date |
Installation checklist copied |
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Background information placed in Site Log |
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Site power voltages verified |
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Required tools available |
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Additional equipment available |
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Router received |
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Optional UniverCD or printed documentation received |
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Chassis components verified |
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Initial electrical connections established |
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ASCII terminal or PC attached to console port |
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Signal distance limits verified |
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Startup sequence steps completed |
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Initial system operation verified |
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Software image verified |
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The Site Log provides a record of all actions relevant to the system. Keep it near the chassis where anyone who performs tasks has access to it. Use the Installation Checklist (see the previous section "Installation Checklist") to verify steps in the installation and maintenance of your system. Site Log entries might include the following:
When setting up your multiport serial router, consider distance limitations and potential electromagnetic interference (EMI) as defined by the Electronic Industries Association (EIA).
| Warning The ports labeled "Ethernet," "10BaseT," "Token Ring," "Console," and "AUX" are safety extra-low voltage (SELV) circuits. SELV circuits should only be connected to other SELV circuits. Because the BRI circuits are treated like telephone-network voltage, avoid connecting the SELV circuit to the telephone network voltage (TNV) circuits. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
The distance limitations for the IEEE 802.3 (10Base5 coaxial cable) specification indicate a maximum segment distance of 1,640 feet (500 m) at a transmission rate of 10 megabits per second (Mbps).
The distance limitations for Ethernet 10BaseT indicate a maximum segment distance of 328 feet (100 m); Ethernet 10Base2 has a maximum segment distance of 606 feet (185 m).
The distance limitations for the IEEE 802.5 specification indicate a maximum segment distance of 328 feet (100 m) at a transmission rate of 4 or 16 Mbps for unshielded twisted-pair (UTP) cable. The distance limitation when using shielded twisted-pair (STP) cabling is 1,640 feet (500 m).
As with all signaling systems, EIA/TIA-232 signals can travel a limited distance at any given bit rate; generally, the slower the data rate, the greater the distance. Table 2-1 shows the standard relationship between baud rate and maximum distance.
| Data Rate (Baud) | Distance (Feet) | Distance (Meters) |
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2400 | 200 | 60 |
4800 | 100 | 30 |
9600 | 50 | 15 |
19200 | 50 | 15 |
38400 | 50 | 15 |
57600 | 25 | 7.6 |
115200 | 12 | 3.7 |
The use of balanced drivers allows EIA/TIA-449 signals to travel greater distances than the
EIA/TIA-232 standard. Table 2-2 lists the standard relationship between baud rate and maximum distance for EIA/TIA-449 signals. These limits are also valid for V.35 and X.21.
| Data Rate (Baud) | Distance (Feet) | Distance (Meters) |
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2400 | 4,100 | 1,250 |
4800 | 2,050 | 625 |
9600 | 1,025 | 312 |
19200 | 513 | 156 |
38400 | 256 | 78 |
56000 | 102 | 31 |
T1 | 50 | 15 |
| Caution The EIA/TIA-449 and V.35 interfaces support data rates up to 2.048 Mbps. Exceeding this maximum could result in loss of data and is not recommended. |
This section discusses important cabling information that must be considered before you connect the terminals or modems to console and auxiliary ports. The console port and the auxiliary port are used to provide access to the system either locally or remotely.
Each multiport serial router includes an EIA/TIA-232 (RJ-45) console asynchronous serial port. This port connects to a terminal using an RJ-45 cable and an RJ-45-to-DB-25 adapter or a PC using the RJ-45 to DB-9 adapter. Depending on the cable and the adapter used, this port appears as a data terminal equipment (DTE) or data communications equipment (DCE) device at the end of the cable. To connect to a terminal, use an RJ-45 roll-over cable with a female DTE connector (labeled Terminal) for connection to the console port. For detailed information on installing the terminal, see the section "Connecting to the Console Port" in the chapter "Installing the Cisco Multiport Serial Routers.")
Table B-1 in the appendix "Cisco Multiport Router Cable Specifications" lists the pinout for the console port. The default parameters for the console port are 9600 baud, 8 data bits, no parity, and 2 stop bits. The console port does not support hardware flow control or modem control.
An EIA/TIA-232 (RJ-45) auxiliary asynchronous serial port is included on all multiport serial routers. This port can connect to a modem for remote maintenance or terminal services. Use an RJ-45 roll-over cable with a male modem (MMOD) adapter (labeled Modem) for this connection. For detailed information on connecting devices to the auxiliary port, see the section "Connecting a Modem to the Auxiliary Port" in the chapter "Installing the Cisco Multiport Serial Routers." See Table B-1 in the appendix "Cisco Multiport Router Cable Specifications" for the pinout for the auxiliary port.
This sections describes important cabling information that must be considered before making your network connections. The Ethernet or Token Ring ports are used to connect to a LAN; the synchronous serial ports are used to connect to a WAN; and the asynchronous ports are used to provide remote access to the multiport serial routers.
You can use the following equipment to connect to the Ethernet AUI port:
The connection to the AUI port can be made using either slide latch connectors or jackscrew connectors
The 10BaseT port is connected to the Ethernet through the twisted-pair wiring, and is modular in design.
The two Token Ring ports are located on the rear panel of the Cisco 2521 and Cisco 2523 and are labeled TOKEN RING or UTP. The port labeled TOKEN RING uses a standard 9-pin Token Ring lobe cable and connects the multiport serial router directly to a media attachment unit (MAU). The Token Ring port labeled UTP uses an RJ-45 Token Ring cable and is connected through an adapter or directly to a MAU. Only one Token Ring port can be used at a time.
The multiport serial routers offer two high-speed synchronous serial ports and from two to eight (depending on which chassis you have) low-speed asynchronous/synchronous serial interface ports that can be configured as synchronous serial interfaces.
The high-speed synchronous serial ports are located on the left of the rear panel and are labeled SERIAL 0 and SERIAL 1.
The serial ports are 60-pin, D-type connectors. All serial interfaces (except the EIA-530) can be configured as DTE or DCE, depending on the attached cable. The EIA-530 interface is only configured as DTE. All DTE serial ports require that external clocking be provided by a channel service unit/data service unit (CSU/DSU) or other DCE device.
You must use a special serial cable to connect a multiport serial router to a modem or CSU/DSU. This cable is available from Cisco and is usually ordered with the system. The cable uses a DB-60 connector on the chassis end. See the appendix "Cisco Multiport Router Cable Specifications" for cable pinouts. For ordering information, contact a customer service representative.
The asynchronous/synchronous serial ports use the asynchronous/synchronous 60-pin connectors located on the rear panel. The lower ports are labeled Serial 2 (A/S) and Serial 3 (A/S): the upper ports (depending on which chassis you have) are labeled Serial 4 (A/S) through Serial 9 (A/S).
You must use a special serial cable to connect a multiport serial router to a modem or CSU/DSU. This cable is available from Cisco and is usually ordered with the system. The cable uses a DB-60 connector on the chassis end. See the appendix "Cisco Multiport Router Cable Specifications" for cable pinouts. For ordering information, contact a customer service representative.
On models with a Basic Rate Interface (BRI) port, the BRI port is an RJ-45 8-pin connector located between the UTP and console ports on the Cisco 2520 and Cisco 2521, or between the 10BT and console ports on the Cisco 2522 and Cisco 2523. Use an appropriate cable to connect the system directly to the Integrated Services Digital Network (ISDN) through the NT1. The common carrier will provide the NT1 connection worldwide, except in North America, where the NT1 is customer owned.
| Warning Network hazardous voltages are accessible in the BRI cable. If you detach the BRI cable, detach the end away from the multiport serial router first to avoid possible electric shock. Network hazardous voltages also are accessible on the system card in the area of the BRI port (RJ-45 connector), regardless of whether power is turned off. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
| Warning The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or connection hardware. Any hardwired connection (other than by nonremovable, connect-one-time-only lug) must be made only by PTO staff or suitably trained engineers. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.") |
Do not unpack the multiport serial router until you are ready to install it. If the final installation site will not be ready for some time, keep the chassis in its shipping container to prevent accidental damage. When you have determined where you want the multiport serial router installed, proceed with the unpacking.
The multiport serial router, cables, UniverCD or printed publications, and any optional equipment you ordered might be shipped in more than one container. When you unpack each shipping container, check the packing list to ensure that you received the following items:
Inspect all items for shipping damage. If anything appears to be damaged, or if you encounter problems when installing or configuring your system, contact a customer service representative.
Posted: Wed May 19 07:44:19 PDT 1999
Copyright 1989-1999©Cisco Systems Inc.