Replacing Serial Port Adapters - Cisco 7000 Hardware Installation And Maintenance

Installing and Configuring Processor Modules
If you are changing the mode of the interface from DCE to DTE, you do not need to change the clock
rate command for the port. After you replace the DCE cable with a DTE cable and the system
recognizes the interface as a DTE, it will use the external clock signal from the remote DCE device
and ignore the internal clock signal that the DCE interface normally uses. Therefore, once you
configure the clockrate on a port for either a DCE interface or loopback, you can leave the clockrate
configured and still use that port as a DTE interface.

Replacing Serial Port Adapters

Serial port adapters provide the high-density ports for FSIP serial interfaces. Each port adapter
provides two ports, and each port supports any one of the available interface types: EIA/TIA-232,
EIA/TIA-449, V.35, X.21, and EIA-530. (See the section "Serial Port Adapters" in the chapter
"Product Overview.".) The adapter cable connected to the port determines the electrical interface
type and mode (DTE or DCE) of the interface. Each FSIP is shipped from the factory with four or
eight port adapters installed. Port adapters are spares; if you have spares on hand and have a failure,
you can replace interfaces without having to return the FSIP to the factory. You cannot, however, add
ports to an FSIP by installing additional port adapters. The four-port FSIP supports only one
four-port module. To change the electrical interface type or mode of a port, you need only replace
the adapter cable and reset the interface. When setting up a DCE port, you must also set the clock
rate. Although DCE is the default mode, you do not need to specify the mode when configuring DTE
interfaces. When the port recognizes the DTE interface cable, it automatically uses the clock signal
from the remote DCE device.
Caution
attempt to isolate faults or to troubleshoot FSIPs or serial interfaces by swapping port adapters. The
surface-mount circuitry on the port adapters will not tolerate excessive handling.
All serial interface types support NRZI format, which you set with a software command. (Refer to
the section The SIMM sockets use the thumb tabs that are often used in PCs and other computer
equipment. Each RSP7000 SIMM socket has two metal retaining springs, one at each end. (See
Figure 5-16.) When a SIMM is fully seated in the socket, the retaining springs snap over the ends of
the SIMM to lock it in the socket. later in this chapter.) For complete command descriptions and
instructions, refer to the related software documentation.
Tools Required
You need the following tools to complete this procedure:
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Removing the FSIP
Two or four port adapters (each port adapter provides two ports) are installed on each FSIP at the
factory, so in order to install a new port adapter (or to replace an existing one), you need to remove
an existing port adapter. Each four-port module on an FSIP is driven by a CPU; four-port FSIPs
contain one processor, and eight-port FSIPs contain two processors. You cannot add additional ports
to a four-port FSIP to upgrade it to eight ports.
5-210 Cisco 7000 Hardware Installation and Maintenance
Remove and install port adapters only when it is necessary to replace interfaces. Do not
Number 1 Phillips or 3/16-inch flat-blade screwdriver
3/16-inch nut driver
Wrist strap or other grounding device to prevent ESD damage