Administrator's Guide

Trunk Group
Issue 5 October 2002 1263555-233-506
See ‘‘Transmission and supervisory signaling’’ on page 1908 for more
information. Procedures in ‘‘Managing trunks’’ on page 411 give specific
suggestions for signaling to use with different types of trunk groups.
Valid entries Usage
ground-start
Use ground-start signaling for two-way trunks whenever
possible: ground-start signaling avoids glare and provides
answer supervision from the far end.
loop-start
In general, try to use loop-start signaling only for one-way
trunks. Loop-start signaling is susceptible to glare and does
not provide answer supervision.
auto/auto
The term before the slash tells the switch how and when it
will receive incoming digits. The term after the slash tells the
switch how and when it should send outgoing digits.
■ auto — Used for immediate connection to a single preset
destination (incoming CO trunks, for example). No
digits are sent, because all calls terminate at the same
place.
■ delay — The sending switch does not send digits until it
receives a delay dial signal (an off-hook signal followed
by an on-hook signal) from the far-end switch, indicating
that it’s ready to receive the digits.
■ wink — The sending switch does not send digits until it
receives a a wink start (momentary off-hook) signal from
the far-end switch, indicating that it’s ready to receive
the digits.
■ immed — The sending switch sends digits without
waiting for a signal from the far-end switch.
auto/delay
auto/immed
auto/wink
2-wire-ac
These entries are used with CO trunks in Russia: enter the
type of connection to your central office. Check with you
network service provider if you don’t know what type of
connection they’re using. To use these entries, the Country
field must be
15 and the CO trunks must use ports on a
TN2199 circuit board.
2-wire-dc
3-wire