DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-733ISDN-TRK (DS1 ISDN Trunk)
3
ISDN-TRK (DS1 ISDN Trunk)
A DS1 ISDN Trunk is known as a B-channel. It is a 64 kbps Bearer channel that
can be used to transmit d igital traffic, be it voic e or data. These trunks use a
separate channel for signal ing (for example, for call setup ); this mode of
operation is known as out-of-band signaling, as opp osed to in-band, robb ed-bit
signaling, where the signalin g traffic flows over the same channel as the voice or
data traffic. The separate sig naling channel is called a D-channel in ISDN
terminology, and it carries all the c all control signaling messag es for the DS1
ISDN Trunk B-channels. The D-channel for these B-channels is an ISDN-PRI
(Primary Rate Interface) Signaling Link Port (ISDN-LNK/ISDN-PLK).
On 24-channel interfaces, any of the f irst 23 ports on the DS1/UDS1 interface
circuit pack c an be a B-channel. The 24th port may b e used as a B-channel or as
a D-channel depend ing on the type of ISDN-PRI Signaling Group (ISDN-SGR) to
which it belongs.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run Full Name of MO
ISDN-TRK1
1. For additional repair information, refer to the "DS1-BD (DS1 Interface Circuit Pack)"
maintenance objec t.
MAJOR2
2. A MAJOR alarm on a trunk indicates that alarms on these trunks are not downgraded by the
set options command and that at least 75 percent of the trunks in this trunk group are
alarmed.
test p ort PCSSp p l DS1 ISDN Tr unk
ISDN-TRK MINOR test port PCSSpp l DS1 ISDN Trunk
ISDN-TRK WARNING test port PCSSpp sh DS1 ISDN Trunk