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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Screen reference
992Trunk Group
17
Auto Guard
This field controls ports only on TN438B, TN465B, and TN2147 circuit packs.
TN438B ports have hardware support for detecting a defective trunk. TN465B and
TN2147 ports consider a trunk defective if no dial tone is detected on an outgoing
call, and the Outpulse Without Tone field is
n on the Feature-Related System
Parameters screen.
Call Still Held
This field is used when the receiving switch initiates the disconnection of
incoming calls. It effectively extends the Incoming Glare Guard timer by 140
seconds. This field affects only TN438B, TN465B, and TN2147 ports and is used
primarily when the Country Code field is
2.
Sig Bit Inversion
When transmission facilities use bit-oriented signaling (such as CAS), 2 bits are
used to transmit seizure and release signals for calls. Called the A-bit and the
B-bit, their meaning can vary. For example, in the A-bit a “1” might mean
on-hook and a “0” might mean off-hook. The entry in the Country Protocol field
on the DS1 Circuit Pack screen sets the default meaning of these bits.
For trunk ports on TN2242 and TN464B and later circuit packs, this field allows
you to invert the A- and B-bits as necessary so that the far-end switch can
understand your switch’s seizure and release signals. If the far-end switch, such as
a central office, on this trunk group interprets the A- and B-bits differently from
Valid entries Usage
y/n
Enter y to prevent repeated seizures of a defective trunk. The
switch will do a maintenance busy-out on these trunks.
Valid entries Usage
y/n
Enter y to prevent glare by delaying an outgoing seizure of a
trunk for at least 140 seconds after it is released from an
incoming call.