Alcatel-Lucent 1850 TSS-5 supports path switched ring applications using the SONET path protection switching schemes described in Telcordia ® GR-1400. This scheme offers 60-millisecond restoration times and simple network administration for access applications. The ring facility consists of two fibers, with service and protection traffic travelling in opposite rotations around the ring. Each input is bridged and transmitted in both directions around the ring. The receiving end terminal monitors the quality of both signals and selects the best signal to drop.
Subnetwork connection protection (SNCP) is supported for SDH rings. Alcatel-Lucent 1850 TSS-5 supports SNC/n non-revertive 1+1 unidirectional path switching as described in ITU-T G.808.1.
Alcatel-Lucent 1850 TSS-5 supports the following OC-3/12/48 ring configurations:
Path protection switching is non-revertive. STS-n path switching is triggered by incoming line LOP, AIS, and unequipped or STS-n path BER exceeding a provisionable 10-3 to 10-5 threshold or signal degrade threshold. The system also supports VT path protection switching based on VT AIS, LOP, unequipped, and signal degrade.
Alcatel-Lucent 1850 TSS-5 supports the following STM-1/STM-4/STM-16 subnetwork connection protection ring configuration:
Path protection switching is non-revertive. SDH failures/degrade conditions for switching are defined in G.783 (Section 12.1.1.1). The Alcatel-Lucent 1850 TSS-5 supports SNC/Ne non-revertive 1+1 unidirectional path switching version of SNCP described in ITU-T G.808.1. SNCP switching is based on LOP, AIS, UNEQ, EXC (SF-BER), and DEG (SD-BER). SNCP EXC (hard BER signal failure) has the same switch priority as other hard failures.
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