VeEX UX400, User Manual

Page: 185 / 209

7.5.5 Payload Labels
This function is used to set the C2 and V5 Path Signal Labels which indicate the content of the High order and Low order VCs.
Tap the Payload Label icon to display the payload label screens. There are dedicated tabs for Transmitted and Received payload labels and setups:
C2 [HP Path]: Path signal label
Specifies the mapping type in the VC-n
Program the TX or RX label by editing the hexadecimal value or by using the convenient drop-down menu selection
For the RX label, enable or disable the Payload Mismatch (PLM) Alarm
TX C2 [HP] RX C2 [HP]
V5 [LP Path]: Path signal label
Program the TX and RX label by editing the hexadecimal value or by using the convenient drop-down menu selection
For the RX label, enable or disable the Payload Mismatch (PLM) Alarm
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7.5.6 APS Tasks
7.5.6.1 APS Timing
This function measures the Automatic Protection Switching (APS) limits of the network. APS applies only to the Multiplex sections of a SDH network and enables network
elements to re-route traffic to a backup circuit in the event of network failure or problems. The protection mechanism is coordinated by the K1 and K2 bytes in the Multiplexer
Section Overhead.
APS Standards
The principles and protocols of APS in SDH networks are defined in ITU-T G.783 and G.841 and Bellcore GR-253 recommendations for Linear and Ring network
architectures respectively. According to recommendations, the re-routing of the signal has to occur within 50ms. Protection switching is initiated as a result of one of
the following conditions:
“Hard” Failure (SF) condition – Loss of Signal (LOS), MS-AIS, BER > 1 x 10
-3
.
“Soft” Failure (SD) condition – Signal degradation when BER exceeds a predetermined threshold. Normally over a provisioned range of 1 x 10
-5
to 1 x 10
-9
.
Tap the APS Testing icon to display the APS testing screen shown below.
Sensor:
Select the trigger that will initiate the APS measurement
The selections are LOS, LOF, SDH FAS, B1, MS-AIS, MS-RDI, MS-REI, B2, AU-AIS, AU-LOP, B3, HP-RDI, HP-REI, LSS and None
Switch Time Limit
: Configurable in the range from 15ms to 200ms
Typically 50ms according to ITU-T recommendations
Gate Time
: Configurable in the range from 50ms to 4 seconds
Used to measure total service disruption when multiple switches or micro interrupts occur
Repeat
: ON/OFF
Configurable to measure on a continuous basis
Start
: Press to begin the test
APS Timing Setup
UX400 10G e-Manual D07-00-058P RevA00 Page 185 of 209