Inter-Tel AXXESS Manual page 1408

Appendix A — Networking
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INTER-TEL AXXESS
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Page A-6
MANUAL VERSION 11.0 – May 2008
Eliminate data errors whenever possible. Currently, the system can experience slow-
downs during error dumps. The most common preventable errors are:
— T1 errors: Among other things, ensure any Primary Rate Daughter Cards are
Revision F or above or have ECN 5669 applied (EPROM 827.8894 installed in
socket U4).
— Fiber errors: Ensure all PCM-F cards are revision M or above or have ECN 5574
applied.
— Glare: Ensure the Inter-Tel system and central office are programmed to minimize
glare by initiating outgoing calls on the opposite end of a trunk groups from the
starting point for incoming calls. Even when configuring in this manner, glare is
possible when the system gets very busy, but the likelihood of a glare condition is
greatly reduced.
Turn off diagnostics except when working with Engineering or Technical Support
to troubleshoot a problem. Diagnostics require computer resources and they can
adversely affect the speed of heavily loaded nodes.
Ensure enough T1 spans are installed between nodes to handle the traffic. In most
cases, a single T1 span between nodes will suffice. However, if lots of calls are antici-
pated between two nodes, add another T1 span to handle the traffic.
Avoid doing DB Programming during peak business hours.
Avoid using System OAI on a heavily loaded node. Redistribute the load by moving
traffic not associated with the System OAI application to another node (adding a node,
if necessary). Or, use the CP Server on the node.
When using Paging:
— Avoid using a lighted DSS/BLF Button for the main page zone (e.g., 9600 or
9601).
— Limit page zones to 60 or fewer stations for customers who need to make more
than 30 pages per hour. Use external paging whenever possible. Or, use the CP
Server on the node.
Avoid overloading all-ring hunt groups. Avoid all-ring hunt groups with ten or more
stations that are expected to handle more than 500 calls in an hour. Use linear or distrib-
uted ringing instead of all-ring. Or, use the CP Server on the node.
NOTE:
A CP Server is required to support off-node members of an all-ring hunt group.
Avoid large hunt groups. Avoid creating node with hunt groups containing more than
100 members. Distribute the hunt groups over several nodes, if possible. Or, use the CP
Server on the node.
When using an ATM Switch:
— Make sure the chassis within the node do not overlap time zones. The ATM
Switch cannot synchronize across time zones.
— Make sure the chassis within the node do not overlap area codes unless the area
codes are considered local. If there is an overlap with local area codes, enable ten-
digit dialing for that node.
Design the Network