Cisco ASR 1000 Configuration Guide

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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
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Chapter 18 Configuring the 4-Port Serial Interface SPA
Configuration Tasks
Specifying the Interface Address on a SPA
SPA interface ports begin numbering with “0” from left to right. Single-port SPAs use only the port
number 0. To configure or monitor SPA interfaces, you need to specify the physical location of the SIP,
SPA, and interface in the CLI. The interface address format is slot/subslot/port, where:
• slot—Specifies the chassis slot number in the Cisco ASR 1000 Series Routers where the SIP is
installed.
• subslot—Specifies the slot of the SIP where the SPA is installed.
• port—Specifies the number of the individual interface port on a SPA.
The following example shows how to specify the first interface (0) on a SPA installed in the first subslot
of a SIP (0) installed in chassis slot 2:
Router(config)# interface serial 2/0/0
For more information about identifying slots and subslots, see the “Identifying Slots and Subslots for the
SIP and SPAs” section on page 4-1.
Optional Configurations
There are several, but optional, configurations that may be necessary to complete the configuration of
your serial SPA.
• Configuring Timing Signals, page 18-7
• Inverting the Clock Signal, page 18-9
• Configuring NRZI Format, page 18-9
• Configuring Cyclic Redundancy Checks, page 18-10
• Configuring Encapsulation, page 18-10
Configuring Timing Signals
All interfaces support both DTE and DCE mode, depending on the mode of the compact serial cable
attached to the port. To use a port as a DTE interface, you need only connect a DTE compact serial cable
to the port. When the system detects the DTE mode cable, it automatically uses the external timing
signal. To use a port in DCE mode, you must connect a DCE compact serial cable and set the clock speed
with the clock rate configuration command. You must also set the clock rate to perform a loopback test.
This section describes how to set the clock rate on a DCE port and, if necessary, how to invert the clock
to correct a phase shift between the data and clock signals.

Cisco ASR 1000 Specifications

General

Brand	Cisco
Model	ASR 1000
Category	Network Router
Language	English