Nortel ISDN Signaling Link, Description, Installation And Operation

Page: 97 / 380

ITG Engineering Guidelines Page 97 of 378
ITG Trunk 2.0 ISDN Signaling Link (ISL) Description, Installation and Operation
WAN route engineering
After T-LAN traffic is calculated, determine the bandwidth requirement for
the WAN. In this environment, bandwidth calculation is based on network
topology and destination pair.
Before network engineering can begin, the following network data must be
collected:
• Obtain a network topology and routing diagram.
• List the sites where the ITG nodes are to be installed.
• List the site pairs with ITG traffic, and the codec and frame duration
(payload) to be used.
• Obtain the offered traffic in CCS for each site pair; if available, separate
voice traffic from fax traffic (fax traffic sent and received).
• In a network with multiple time zones, use the same real time busy hour
(varying clock hours) at each site that yields the highest overall network
traffic.
• Traffic to a route is the sum of voice traffic plus the larger of one way fax
traffic (either sent or received).
To illustrate this process, the following multi-node engineering example is
provided.