When Alcatel-Lucent 1850 TSS-5 is equipped with SYSCTL and VLNC50/52/55 circuit packs to function as a network element, there is no inherent limit to the total number of NEs in a SONET/SDH transmission network with it. However, there is a limit to the number of nodes that can be in the same OSI domain, with OSI LAN and/or DCC connectivity for operations communications among the NEs.
A maximum of 250 OSI nodes is supported, unless IS-IS Level 2 Routing is used. With Level 2 Routing enabled, a maximum of 1000 OSI nodes are supported in a domain of up to 50 Level 1 areas. Each Alcatel-Lucent 1850 TSS-5 counts as one OSI node.
To simplify administration and minimize provisioning, the number of nodes included in the same OSI domain should be limited to no more than 1000, whenever practical, by disabling all OSI LAN and DCC between some logical groupings of NEs.
IS-IS Level 2 Routing involves the assignment of NEs to multiple areas of less than 250 nodes each. Level 2 routers support OSI communications between the NEs in different areas. Both the assignment of NEs to areas and the enabling of NEs as Level 2 routers is accomplished by provisioning.
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