DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-955ISDN-TRK (DS1 ISDN Trunk)
9
ISDN-TRK (DS1 ISDN Trunk)
NOTE:
Many trunk problems are caused by incorrect settings of parameters on the
trunk group administration form. Settings must be compatible with the local
environment and with parameter settings on the far-end. The Application
Notes section of that book shows the correct settings for administrable
timers and other parameters on a country-by-country basis.
NOTE:
See the figures in the ‘‘ISDN-SGR (ISDN-PRI Signaling Group)’’ section of
this chapter for an illustration of the principles described below. Throughout
this section, the general term DS1 circuit pack refers to TN464 and TN767
series circuit packs.
A DS1 ISDN trunk is a 64 Kbps bearer channel used to transmit digitized voice or
data traffic. These trunks, or B-channels, use a separate channel, the D-channel
for call-control signaling. This mode of operation is known as out-of-band
signaling, as opposed to in-band robbed-bit signaling, in which signaling is
carried in the same channel as the voice or data traffic. One D-channel, or ISDN
signaling link (ISDN-LNK), carries signaling messages for several B-channels,
forming an ISDN signaling group (ISDN-SGR).
A B-channel may be a port on either a TN464 series UDS1 circuit pack or a
TN767 series DS1 Interface circuit pack.
Two types of DS1 interfaces exist:
■ 24 DS0 channels on a 1.544 Mbps link
■ 31 DS0 channels + 1 framing channel on a 2.048 Mbps link
MO Name (in
Alarm Log) Alarm Level
Initial Command to
Run
1
1. UU is the universal cabinet number (1 for PPN, 2 -44 for EPN s). C is the carrier
designation (A, B, C, D, or E). SS is the number of the slot in which the circuit pack
resides (01 to 21). pp is the two digit port number (01, 02, ...).
Full Name of MO
ISDN-TRK
2
2. For additional repair information, see also DS1-BD for TN767 ports and UDS1-BD for
TN464C/D ports.
MAJOR
3
3. A MAJOR alarm on a trunk indicates that alarms on these trunks are not downgraded
by the set options command.
test port UUCSSpp l DS1 ISDN Trunk
ISDN-TRK MINOR test port UUCSSpp l DS1 ISDN Trunk
ISDN-TRK WARNING test port UUCSSpp sh DS1 ISDN Trunk
