Specifications

6-4
Cisco XR 12000 Series Router SIP and SPA Software Configuration Guide, Release 3.2
Release 3.2, OL-6396-01, Rev.A1 January 9, 2006
Chapter 6 Configuring POS SPAs on Cisco IOS XR Software
Configuration Tasks
Step 3
clock source {internal | line}
Example:
RP/0/0/CPU0:router(config-sonet)# clock source
internal
(Optional) Configures the SONET port TX clock source,
where:
• internal—Sets the internal clock. Use this option when
two routers are connected back-to-back or over fiber for
which no clocking is available.
• line—Sets the clock to be recovered from the line
(default). Use this option whenever clocking is derived
from the network.
Step 4
delay trigger line value
Example:
RP/0/0/CPU0:router(config-sonet)# delay trigger
line 0
(Optional) Configures the SONET port delay trigger line
value, where the trigger value can be 0–511 milliseconds
and the default is 0.
Step 5
framing {sdh | sonet}
Example:
RP/0/0/CPU0:router(config-sonet)# framing sonet
(Optional) Configures the controller framing, where:
• sdh—Specifies Synchronous Digital Hierarchy (SDH)
framing.
• sonet—Specifies SONET framing (default).
Step 6
loopback {internal | line}
Example:
RP/0/0/CPU0:router(config-sonet)# loopback
internal
(Optional) Configures the SONET controller for loopback
where
• internal—Selects internal (terminal) loopback.
• line—Selects line (facility) loopback.
Step 7
overhead {j0 | s1s0} byte-value
Example:
RP/0/0/CPU0:router(config-sonet)# overhead s1s0
(Optional) Configures the controller’s overhead where
• j0—Specifies the synchronous transfer signal (STS)
identifier (J0/C1) byte (default is 0xcc).
• s1s0—Specifies bits s1 and s0 of H1 byte (default is 0).
Step 8
ais-shut
Example:
RP/0/0/CPU0:router(config-sonet)# ais-shut
(Optional) Configures the automatic insertion of a line
alarm indication signal (LAIS) in the sent SONET signal
whenever the SONET port enters the administrative
shutdown state.
Step 9
threshold {b1-tca | b2-tca | sd-ber | sf-ber}
bit-error-rate
Example:
RP/0/0/CPU0:router(config-sonet)# threshold
b1-tca 4
(Optional) Configures the bit-error rate (BER) threshold
values of the specified alarms for a SONET controller.
Command or Action Purpose