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Use this chapter format for installing cables if your cabling procedures cover several pages. Otherwise, just put the cabling info at the end of the installation chapter.
To continue your PA-XXX port adapter installation, you must attach the port adapter cables. The instructions that follow apply to all supported platforms. This chapter contains the following sections:
(Required, if you use this chapter format. Otherwise, put this info at the end of the Installing chapter.)
This section was written for a compact serial cable. Modify the text to fit your particular cable.
On a single PA-XXX, you can use only one compact serial cable. PA-XXX compact serial cables are available only from Cisco Systems.
 | Caution You can attach only an EIA/TIA-V.35 compact serial cable to the PA-XXX 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. |
To connect a compact serial cable to a PA-XXX, follow these steps:
Step 1 Attach the compact serial cable directly to the receptacle on the PA-XXX and tighten the strain-relief screws. (See Figure 4-1.)
| Caution You must attach compact serial cables correctly, or damage to the cable plug will result. Attempting to force a cable plug on the 200-pin receptacle can damage the plug. (See Figure 4-2.) |
Step 2 Attach the network end of your serial cable to your DSU, CSU, DTE, or other external synchronous-serial equipment and tighten the strain-relief screws.
This completes the procedure for attaching a PA-XXX compact serial cable to the PA-XXX. If you need to replace a PA-XXX compact serial cable, proceed to the "Determining the Port Mode" section; otherwise, proceed to "Configuring the PA-XXX."
(Required for serial, optional for rest---if you use this chapter format.)
This section was written for a compact serial cable. Modify the text to fit your particular cable.
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 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.
| Caution You can attach only an EIA/TIA-V.35 compact serial cable to the PA-XXX 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 DTE 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 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).
Step 1 Enter configuration mode. At the privileged level of the EXEC, specify the port address and shut down the interface. (See the "Using the EXEC Command Interpreter" section for an explanation of the privileged level of the EXEC.)
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#
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#
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-XXX 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
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
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 replacing a PA-XXX compact serial cable on the PA-XXX. Proceed to "Configuring the PA-XXX."
Posted: Fri Apr 28 08:42:56 PDT 2000
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