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Configuring LOS Detection on CTP and SAToP Bundles (CTP Menu)
Copyright © 2018, Juniper Networks, Inc.
Starting with CTPOS Release 7.2R1, CTP devices support the detection of a loss of signal,
which denotes a physical link problem. The following conditions are supported:
In a serial both-ended Y-cable redundancy configuration (hardware-based redundancy
or software-based Y cable link protocol), removal of Y cable leg from the CTP port of
the online bundle must be able to force a switch to the standby bundle.
In a T1/E1 both-ended Y cable configuration (hardware-based redundancy or
software-based Y cable link protocol), removal of Y cable leg from the CTP port of the
online bundle must be able to force a switch to the standby bundle.
A CTP series device provides two types of Y-cable redundancy.
Redundancy by using a hardware link that uses a special Y cable
Redundancy by using a software link that does not depend on a signaling hardware
like the Y cable
The CTP devices support a both-ended redundancy mechanism, in which two identical
CTP circuit bundles are combined using Y cables at each end, enabling one bundle to
act as a backup for the other. One of the bundles is in use (online), while the other is in
the standby state (offline). Only the online bundle is allowed to drive the Y cable towards
the user equipment, while the offline bundle is tristate. A communications channel (such
as redundancy by using a hardware link that uses a special Y cable or redundancy based
on a software link that does not depend on a signaling hardware like the Y cable) between
ports at each end determines which of the two ports on the Y cable is currently online.
When one bundle fails, the failed bundle transitions to the offline and places the other
bundle in the online state.
Before you begin:
Disable the bundle before you modify the bundle options.
To configure the capability to detect LOS alarms in a Y-cable redundancy configuration
for CTP and SAToP bundles by using the CTP Menu:
From the Main Menu, select 1) Bundle Operations.
1.
Select 1) CTP.
2.
Select a bundle from the list.
3.
If you select an active bundle, you are prompted to disable the bundle before
configuring it.
Select 3) Port Config.
4.
Select 4) Advanced Options to configure advanced attributed for the CTP bundle.
5.
Chapter 2: Configuring CTP Bundles
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