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This chapter describes how to remove the PA-T3+ port adapter from supported platforms and also how to install a new or replacement port adapter. This chapter contains the following sections:
Each port adapter circuit board is mounted to a metal carrier and is sensitive to electrostatic discharge (ESD) damage.
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Note When port adapter slot is not in use, a blank port adapter must fill the empty slot to allow the router to conform to electromagnetic interference (EMI) emissions requirements and to allow proper airflow across the port adapters. If you plan to install a new port adapter in a slot that is not in use, you must first remove the blank port adapter. |
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Caution Always handle the port adapter by the carrier edges and handle; never touch the port adapter components or connector pins. (See Figure 3-1.) |
Several platforms support online insertion and removal (OIR) of port adapters. Cisco 7200 series routers support OIR for all port adapter types, therefore you do not have to power down routers when removing and replacing a PA-T3+ on Cisco 7200 series routers.
Although the VIP2 and VIP4 supports online insertion and removal, individual port adapters do not. To replace port adapters in the Cisco 7000 series and Cisco 7500 series routers, you must first remove the VIP2 or VIP4 from the chassis and then replace port adapters as required. If a blank port adapter is installed on the VIP2 or VIP4 on which you want to install a new port adapter, you must first remove the VIP2 or VIP4 from the chassis and then remove the blank port adapter.
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Caution To prevent system problems, do not remove port adapters from the VIP2 or VIP4 motherboard or attempt to install other port adapters on the motherboard when the system is operating. To install or replace port adapters, first remove the VIP2 or VIP4 from its interface processor slot |
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Note As you disengage the port adapter from the router, online insertion and removal (OIR) administratively shuts down all active interfaces in the port adapter. |
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Note Before you begin installation, read "Preparing for Installation" for a list of parts and tools required for installation. |
Observe the following warnings and cautions when installing or removing port adapters.
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Caution Do not slide a port adapter all the way into the slot until you have connected all required cables. Trying to do so disrupts normal operation of the router or switch. |
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Note If a port adapter lever or other retaining mechanism does not move to the locked position, the port adapter is not completely seated in the midplane. Carefully pull the port adapter halfway out of the slot, reinsert it, and move the port adapter lever or other mechanism to the locked position. |
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Caution To prevent jamming the carrier between the upper and the lower edges of the port adapter slot, and to ensure that the edge connector at the rear of the port adapter mates with the connection at the rear of the port adapter slot, make certain that the carrier is positioned correctly, as shown in the cutaway in the following illustrations. |
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Warning When performing the following procedures, wear a grounding wrist strap to avoid ESD damage to the card. Some platforms have an ESD connector for attaching the wrist strap. Do not directly touch the midplane or backplane with your hand or any metal tool, or you could shock yourself. |
In this section, the illustrations that follow give step-by-step instructions on how to remove and install port adapters. This section contains the following illustrations:
On a single one-port PA-T3+, you can use two 75-ohm coaxial cables (one for the receive port [RCVR] and one for the transmit [XMTR] port). You can use four 75-ohm coaxial cables on the two-port PA-2T3+. Cisco 75-ohm coaxial cables are available only from Cisco Systems.
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Caution You can attach only an EIA/TIA-612 or EIA/TIA-613 serial cable to the PA-T3+ installed in your router. Attaching a serial coaxial cable of another interface type to the port adapter could damage your router or the hardware at the network end of the cable. |
Each T3 link requires separate receive and transmit connections to your external T3 equipment.
To connect the 75-ohm coaxial cables to the PA-T3+ port adapter, follow these steps:
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Caution To prevent system problems and to maintain the proper cable connection sequences, connect the receive and transmit ports on your PA-T3+ as indicated in Step 2. |
Step 2 Attach the network ends of your two 75-ohm coaxial cables to your external T3 equipment as follows:
The compact serial cable connected to each port determines the mode of the ports (the electrical interface type is always V.35). The default mode of the ports is DCE, which allows you to perform a loopback test on any port without having to attach a port adapter cable. For information related to the loopback command, see the "Using loopback Commands" section. Although DCE is the default, there is no default clock rate set on the interfaces. On a Cisco 7100 series, Cisco 7200 series, or Cisco uBR7200 series router, when there is no cable attached to a port, the software actually identifies the port as cable type: None present rather than either a DTE or a DCE interface. On a VIP2 or VIP4 or the Catalyst RSM/VIP2, when there is no cable attached to a port, the software actually identifies the port as Universal (cable unattached) rather than either a DTE or a DCE interface.
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Caution You can attach only an EIA/TIA-V.35 compact serial cable to the PA-T3+ installed in your router. Attaching a compact serial cable of another interface type to the port adapter could damage your router or the hardware at the network end of the cable. |
Following is an example of the show controllers serial command that shows a Cisco 7100 series router, a Cisco 7200 series router, or a Cisco uBR7200 series router interface port (1/0) that has a V.35 DCE cable attached:
Router# show controllers serial 1/0
M8T-V.35: show controller:
PAS unit 0, subunit 0, f/w version 1-19, Rev id 0x2800001, version 2
idb = 0x60942688, ds = 0x608A6570, ssb=0x608C6CF0
Clock mux=0x0, ucmd_ctrl=0x1C, port_status=0xC
maxdgram=1524, bufpool=32Kb, 64 particles
DCD=up DSR=up DTR=down RTS=down CTS=up
line state: down
cable type: V.35 DCE cable, received clockrate 123984
[display text omitted]
Following is an example of the show controllers cbus command that shows a VIP2 or VIP4 interface port (2/1/0) that has a V.35 DTE cable attached:
Router# show controllers cbus
slot2: VIP2, hw 2.2, sw 21.40, ccb 5800FFA0, cmdq 480000C0, vps 8192
software loaded from flash slot0:muck/amcrae/vip2_21-40.mxt
FLASH ROM version 255.255
Mueslix Serial(8), HW Revision 0x1, FW Revision 1.20
Serial2/1/0, applique is V.35 DTE
gfreeq 48000140, lfreeq 480001B0 (1536 bytes), throttled 0
rxlo 4, rxhi 90, rxcurr 0, maxrxcurr 0
txq 48001A80, txacc 48001A82 (value 58), txlimit 58
[display text omitted]
To change the mode of a port online, use software commands to shut down the interface, replace the compact serial cable, restart the interface, and (if necessary) reconfigure the port for the new interface. At system startup or restart, the system polls the interfaces and determines the electrical interface type of each port (according to the type of compact serial cable attached). However, the system does not necessarily repoll an interface when you change the adapter cable online. To ensure that the system recognizes the new interface type, shut down and reenable the interface after changing the cable.
If you are replacing a cable with a cable that has the same mode, these steps are not necessary (simply replace the cable without interrupting operation).
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 1/0 Router(config-if)# shutdown Ctrl-Z Router#
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 4/0 Router(config-if)# shutdown Ctrl-Z Router#
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Note The preceding example is for Cisco 7140 series routers. For Cisco 7120 series routers, substitute 3 for 4 for the port adapter slot number in the interface address (3/0 in the example). |
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 2/0 Router(config-if)# shutdown Ctrl-Z Router#
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 1/0 Router(config-if)# shutdown Ctrl-Z Router#
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Note For the Cisco uBR7223 router, the port adapter slot number is always 1. For the Cisco uBR7246 router, the port adapter slot number is always 1 or 2. |
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 3/1/0 Router(config-if)# shutdown Ctrl-Z Router#
Step 2 Locate and remove the adapter cable to be replaced.
Step 3 Connect the new cable between the PA-T3+ and the network connection. Tighten the thumbscrews at both ends of the cable to secure it in the ports.
Step 4 Enter configuration mode again, bring the port back up, and save the running configuration to NVRAM.
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 1/0 Router(config-if)# no shutdown Ctrl-Z Router# Router# copy running-config startup-config
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 4/0 Router(config-if)# no shutdown Ctrl-Z Router# Router# copy running-config startup-config
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Note The preceding example is for Cisco 7140 series routers. For Cisco 7120 series routers, substitute 3 for 4 for the port adapter slot number in the interface address (3/0 in the example). |
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 2/0 Router(config-if)# no shutdown Ctrl-Z Router# Router# copy running-config startup-config
Router> enable Password: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 1/0 Router(config-if)# no shutdown Ctrl-Z Router# Router# copy running-config startup-config
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Note For the Cisco uBR7223 router, the port adapter slot number is always 1. For the Cisco uBR7246 router, the port adapter slot number is always 1 or 2. |
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 1/0/0 Router(config-if)# no shutdown Ctrl-Z Router# Router# copy running-config startup-config
These steps prompt the system to poll the interface and recognize the new interface immediately.
When you configure a port for a DCE interface for the first time, or when you set up a loopback test, you must set the clock rate for the port. When you connect a DCE cable to a port, the interface remains down and does not function until you set a clock rate (regardless of the DCE mode default).
If you are changing the mode of the interface from DCE to DTE, you do not need to change the clock rate for the port. After you replace the DCE cable with a DTE cable, and the system recognizes the interface as a DTE, it uses the external clock signal from the remote DCE device and ignores the internal clock signal that the DCE interface normally uses. Therefore, when you configure the clock rate on a port for either a DCE interface or loopback, you can leave the clock rate configured and still use that port as a DTE interface.
This completes the procedure for 75-ohm coaxial cable attachment on PA-T3+ port adapters. Proceed to "Configuring the PA-T3+"
Posted: Mon May 1 13:08:57 PDT 2000
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