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 setting s of parameters on the
trunk group administra tion form. Settings must be comp atible with the local
environment and with parameter settings on the far-end. The Application
Notes section of that book shows the c orrect settings for administrab le
timers and other parameters on a c ountry-by-country ba sis.
NOTE:
See the figures in the ‘‘ISDN-SGR (ISDN-PRI Signaling Group)’’ sec tion of
this chapter for an illustration of the p rinciples desc ribed below. Throughout
this section, the general term DS1 ci rcuit 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-b and
signaling, as opposed to in-band robbed-bit signaling, in which sign aling is
carried in the same chan nel as the voice or data traffic. One D-c hannel, or ISDN
signaling link (ISDN-LNK), carries si gnaling messages for several B-channels,
forming an ISDN signaling group (ISDN-SGR).
A B-channel may be a por t 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 c hannel on a 2.048 Mbps link
MO Name (in
Alarm Log) Alarm Level Initial Command to
Run1
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-TRK2
2. For additional repair information, see also DS1-BD for TN767 ports and UDS1-BD for
TN464C/D ports.
MAJOR3
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 p ort UUCSSpp l DS1 ISDN Trunk
ISDN-TRK WARNING test port UUCSSpp sh DS1 ISDN Trunk