aturesOSN 7500
Technical Manual - System Description
8 Protection
Huawei Technologies Proprietary
8-2
8.1.1 TPS Protection for Tributary Boards
The OptiX OSN 7500 provides 1:N TPS protection for E1, DS1, E3, DS3, E4 and
STM-1 (Electrical) services through electrical interface protection. That is, it provides
TPS protection for PQ1, PQM, PL3, PD3, SPQ4 and SEP1. To be specific, it can
support:
One 1:N (N
≤
4) TPS protection group for E1/T1 service
Two 1:N (N
≤
3) TPS protection groups for E3/DS3/E4/STM-1 service
Coexistence of the above two different TPS protection groups
8.1.2 TPS Protection for Ethernet Boards
The OptiX OSN 7500 supports 1:1 TPS protection for 100M Ethernet FE (electrical)
service, namely, 1:1 TPS protection for the EFS0.
The protection EFS0 is inserted in slot 18, and the protected EFS0 is inserted in slot
17. They work with the ETS8 and TSB8 to implement TPS protection for Ethernet FE
services.
8.1.3 1+1 Backup for ATM/IMA Interface Boards
The OptiX OSN 7500 supports 1+1 backup for ATM data boards
(ADL4/ADQ1/IDL4/IDQ1). Two ATM data boards backup each other. If either fails, the
other takes over.
8.1.4 1+1 backup for the Cross-Connect and Timing Unit
The cross-connection and timing functions are provided by the GXCS board. The
GXCS board use 1+1 backup for protecting the cross-connect unit and the timing unit
at the same time. When the active cross-connect and timing units are working
normally, the standby ones are in standby working mode, not performingthe service
cross-connection function nor providing timing to the system. They have the same
cross-connect matrix setting and clock configuration as the active units. When the
standby units receive the information indicating abnormal performance of the active
units or a switching command sent by the NM system, they will immediately take over
the job of the active units, setting themselves to the active working mode and sending
out a switchover alarm.
8.1.5 1+1 Backup for the SCC Unit
The SCC unit of the OptiX OSN 7500 is provided with 1+1 backup protection. The
standby SCC unit is in standby working mode when the active one is working
normally.
8.1.6 1+1 Backup for the Power Input Unit
