Juniper JUNOSE 10.0.X PHYSICAL LAYER, Руководство по настройке

Страница: 146 / 262

quality — Stratum 3 or better, recovered either from a known good STM port or
from one of the BITS inputs.
■
Although the CLI enables you to specify the keywords internal module to use
the line module’s internal clock, in a production network we recommend that
you do not do this. Instead, specify the keywords
internal chassis to use the
router’s internal clock.
■
For production networks, never specify the keyword line to use the line’s receive
clock as the transmit clock. Although the CLI enables this configuration, it is not
supported because jitter transfer is not compliant for this timing and because
pointer adjustments takes place on the outgoing link.
■
In a nonproduction network, you can configure some ports with internal clock
sources and others with line clock sources. However, all ports with internal clock
sources must use either the router’s clock or the module’s clock. You cannot
configure some ports on the I/O module to use the router’s clock and others to
use the module’s clock.
■
To change the clock source of the ports on a cOC3/STM1 I/O module from the
router’s clock to the module’s clock or vice versa, first change the clock source
of all ports to the line setting, and then to the new internal clock setting.
■
Example
host1(config-controll)# clock source internal chassis
■
Use the no version to revert to the default, line .
■
See clock source.
controller sonet
■
Use to select an interface on which you want to configure channelized SONET
or SDH.
■
Example
host1(config)# controller sonet 4/0
■
There is no no version.
■
See controller sonet.
description
■
Use to assign a text description or an alias to a channelized SONET interface.
■
You can use this command to help you identify the interface and keep track of
interface connections.
■
The description or alias can be a maximum of 64 characters.
■
Use the show controllers sonet command to display the text description.
■
Example
host1(config-controll)# description boston-sonet-interface
120 ■
Configuration Tasks
JUNOSe 10.0.x Physical Layer Configuration Guide