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TIE-DS1 (DS1 Tie Trunk)
Issue 5 October 2002
1677
555-233-119
TIE-DS1 (DS1 Tie Trunk)
The DS1 tie trunk provides both voice and data inter-PBX communication. A 24
channel DS1 Interface circuit pack can support up to 24 digital tie trunks through a
1.544 Mbps DS1 link. A 32 channel DS1 Interface circuit pack can support up to
30 digital tie trunks through a 2.048 Mbps DS1 link. DS1 Interface circuit packs
are described in DS1-BD. DS1 Tie Trunks are used widely in the DCS and Central
Attendant Service (CAS) features of the system.
A DS1 tie trunk can also be used as an access endpoint which is a non-signaling
channel with a bandwidth of voice-grade-data, 56K-data or 64K-data.
DS1 tie trunk maintenance provides a strategy to maintain a DS1 tie trunk via a
port on the DS1 Interface circuit pack. The maintenance strategy covers logging
DS1 tie trunk hardware errors, running tests for trunk initialization, periodic and
scheduled maintenance, system technician-demanded tests, and alarm
escalation and resolution. Three different trunk service states are specified in the
DS1 tie trunk maintenance. They are: out-of-service in which the trunk is in a
deactivated state and cannot be used for either incoming or outgoing calls;
in-service in which the trunk is in an activated state and can be used for both
incoming and outgoing calls; disconnect (ready-for-service) in which the trunk is in
an activated state but can only be used for an incoming call. If the DS1 Interface
circuit pack is out-of-service, all trunks on the DS1 Interface circuit pack are
placed into out-of-service state, and a Warning alarm is raised.
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
TIE-DS1
1
1. For additional repair information, see also DS1-BD (DS1 Interface Circuit Pack)
Maintenance documentation.
MAJOR
2
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 trunk <grp/mbr> l DS1 Tie Trunk
TIE-DS1 MINOR test trunk <grp/mbr> l DS1 Tie Trunk
TIE-DS1 WARNING test trunk <grp/mbr> DS1 Tie Trunk