Cisco ISE - Line Card ISE Manual de usuario descargar pdf (Pagina 9)

Cisco IOSSoftware Configurationforthe Cisco12000Series One-PortChannelized OC-12/STM-4(DS1/E1)ISE Line

How to Configure Layer 1 Features

Cisco IOS Release 12.0(27)S1

Step 3

clock source {internal | line}

Example:

Router(config-controller)# clock source line

Sets the clock source for the 1-Port CHOC-12 ISE line card.

Typically, an 1-Port CHOC-12 ISE line card is connected to

a SONET or SDH add/drop multiplexer (ADM). In this

application, Cisco recommends using the default setting of

clock source line, because:

• The clock source used by the SONET/SDH network is

of higher accuracy than the internal clock source on the

1-Port CHOC-12 ISE line card.

• The SONET/SDH network is designed for optimal

operation in synchronous mode, where all clocks used

in the network can be traced to a single high-accuracy

clock source. Using the internal clock on the line card

port introduces an independent clock source into the

network, and may cause synchronization-related

anomalies to be detected by the SONET/SDH network

elements.

When configured for line clocking, the 1-Port CHOC-12

ISE line card port will automatically default to internal

clocking if the line clock source is considered unusable for

any of the following reasons:

• The port detects a Loss of Signal (SLOS) defect.

• The port detects a Loss of Frame (LOF) defect.

• The port detects a Section (RS) Loss of Frame (SLOF)

defect.

• The port detects a Line (MS) Alarm Indication Signal

(LAIS) defect.

• The port receives the “Do not use for synchronization”

code in byte S1 of the Line (MS) overhead.

• The port has been put into the local loopback mode

through the use of the loopback local controller

command. When the loopback is cleared, the port

reverts to using the line clock source.

Note The OC-12/STM-4 port always sends the “Do

not use for synchronization” code in byte S1 of

the Line (MS) overhead toward the directly

connected ADM.

Command or Action Purpose

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