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86 C
HAPTER 4: CHASSIS CONFIGURATION
! POS Module
slot 1/8
!
! Interface 1/8/1 POS MAC
interface pos 1/8/1
arp timeout 0
!
! BasPppProtocol
root
Configuring Clock Sources
The Cuda 12000 IP Access Switch backplane has a primary clock (A) and a
secondary clock (B). For each of these clocks, you can configure one of the
following clock sources:
■ External BITS-A clock source
■ External BITS-B clock source
■ External Packet-Over-SONET (POS) clock source
■ Internal Stratum-3 oscillator clock source on the management module
If you do not configure any clock sources, each DOCSIS/EuroDOCSIS module
uses its own clock.
If you are using a BITS-A or BITS-B external clock source, make sure that the
Cuda 12000 is connected to the appropriate clock sources via the BITS-A or
BITS-B external clock connectors. Refer to the Cuda 12000 IP Access Switch
Installation Guide for more information on these connectors.
If you are using a POS module as the clock source, make sure that the
interface on the POS module has been configured to receive clocking from
the other (remote) side of the POS link. To do this, issue the following
command from within POS interface mode:
clock-source line
Refer to Chapter 7 “Packet Over SONET Administration” for more
information on configuring POS interfaces.