Specifications

2-2
Cisco ONS 15454 and Cisco ONS 15327 TL1 Command Guide, R3.3
May 2002
Chapter 2 TL1 Gateway
Gateway Network Element Topology
Figure 2-1 Example of a GNE topology
Each GNE can support six (5+1) concurrent gateway communication sessions (connections from an OS
to the GNE). Five of these sessions are via the LAN (wire-wrap, active TCC+ LAN port, or DCC) and
the sixth session is reserved for the active TCC+ serial port.
On each gateway communication session a GNE can establish TL1 sessions to up to 31 additional DCC-
connected nodes, for a total DCC of 32 nodes. Each GNE can handle 32 nodes and 6 concurrent
communication gateway sessions, and the GNE can handle up to a maximum of 96 ENEs/GNE. You can
dynamically distribute the ENEs to balance the number of concurrent gateway communication sessions
versus the number of NEs on the DCC. The GNE treats the 6 (5+1) concurrent gateway communication
sessions and 96 ENEs/GNE limit as a resource pool (Table 2-1) and continues to allocate resources until
the pool is exhausted (see Table 2-2 for allocation examples). When the pool is exhausted the GNE
returns an “All Gateways in Use” message or an “All ENE Connections in Use” message.
55276
Number of connections
Node 1 Node 2
OSS
Node 3
Autonomous messages
TLI Gateway node
Single connection
Command/Response
Table 2-1 Gateway Resource Pool
Number of GNEs
Number of GNE
Sessions Number of ENEs
Maximum Number of
ENE sessions/GNE session
1 6 (5+1) 96 (dynamically allocated) 31