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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Screen reference
983Trunk Group
17
Trunk Type
Use this field to control the seizure and start-dial signaling used on this trunk
group. Entries in this field vary according to the function of the trunk group and
must match the corresponding setting on the far-end switch. This field appears for
CO, DID, FX, and WATS trunk groups.
Refer to ‘‘Transmission and supervisory signaling’’ on page 1569
for more
information. Procedures in ‘‘
Managing trunks’’ on page 337 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