Alcatel-Lucent 1850 TSS-5 supports OC-3, OC-12, STM-1, and STM-4 optical connections for the transport of TDM or Packet over SONET/SDH (POS) data. This section briefly describes the major optical and packet network topologies.
By default, Alcatel-Lucent 1850 TSS-5 supports protected and unprotected linear optical extensions. The linear optical extension may connect the Alcatel-Lucent 1850 TSS-5 shelf, by way of network interfaces in the VLNC50/52/55 (OC-3/STM1, OC-12/STM-4, OC-48/STM-16), to an OC-12/STM-4, OC-48/STM-16 or OC-192/STM-64 node with OC-3/STM-1, OC-12/STM-4, OC-48/STM-16 tributary interfaces or to an OC-3/STM1, OC-12/STM-4, or OC-48/STM-16 node through the network interface.
When UNPROT (protection-not-allowed), the two lines on the same board (OC-3/STM-1, OC-12/STM-4, OC-48/STM-16) must be the same rate and may be either 0x1 (default) or UPSR/SNCP.
When PROT (equipment-protection-allowed), each pair of lines across the boards may be a different rate and may be either 0x1, 1+1, or UPSR/SNCP. The two pairs of lines can have different applications.
Alcatel-Lucent 1850 TSS-5 supports VT1.5, STS-1, STS-3c, STS-12c path-level UPSRs, and VC-12, VC-3 (low-order), VC-4, and VC-4-4c level SNCPs. A switch fabric in the VLNC50/52/55 circuit pack supports the tributary interfaces. This circuit pack establishes both an east-to-west and a west-to-east rotation on the ring. A UPSR/SNCP ring provides a very valuable and reliable foundation for services protecting against fiber cuts and node failures.
For SDH, Alcatel-Lucent 1850 TSS-5 supports SNC/Ne non-revertive 1+1 unidirectional switching. SNC/N (non-intrusive subnetwork connection) switching rules for Alcatel-Lucent 1850 TSS-5 are similar to those for UPSR. Switching is based on LOP, AIS, UNEQ, EXC (SF-BER), and DEG (SD-BER). However with SNCP, EXC (hard BER signal failure) has the same switch priority as other hard failures.
Pairing and pass-throughs are limited to a path and its companion (same timeslot on the other line). When UNPROT (protection-not-allowed), the two lines on the same board (OC-3/STM-1 or OC-12/STM-4) must be the same rate and the paths are paired across the two lines on the same pack. When PROT (equipment-protection-allowed), each pair of lines across the boards may be a different rate and the paths are paired across the packs.
The Alcatel-Lucent 1850 TSS-5 supports OC-3/STM-1 and OC-12/STM-4 optical extensions, including single- and dual- homed ring extensions. A DDM-2000 OC-3/STM-1, OC-12/STM-4, Alcatel-Lucent 1850 TSS-5, , or Alcatel-Lucent 1665 DMXtend may be the add/drop multiplexer on the ring.
The VLNC50/52/55 SONET/SDH Transport circuit pack supports TMUX services on the DS3 port b-3 provisioned as channelized. The channelized DS3 signal can be mapped into 28 DS1 signals. A DS1 signal can be cross-connected to a VT1.5 tributary or a DS1 port.
The following sections describe some typical service applications supported by the Alcatel-Lucent 1850 TSS-5 shelf. This set of applications does not describe all possible applications of the Alcatel-Lucent 1850 TSS-5, but merely shows some common network scenarios.
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