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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-463DIOD-TRK (DIOD Trunk) [G1.2SE]
10
DIOD-TRK (DIOD Trunk) [G1.2SE]
Direct Inward and Outward Dial (TN429 DIOD) trunks are 2-wire analog lines to
the CO which support the following services:
■ both incoming and outgoing CO calls
■ DID trunk
■ DID Trunk and 1-way Outgoing DIOD
The DIOD Trunk circuit pack provides eight ports for loop-start CO. The circuit
pack is an interface between the 2-wire analog line from the CO and the system’s
(4-wire) TDM Bus.
LOOP START OPERATION
Idle State - Tip = ground, Ring = CO Battery
A. Outgoing Call
1. PBX Off-Hook (Seize Message): Closes the Tip-Ring Loop
a. CO Response: DC loop current + Dial tone
2. PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current
a. CO Response: CO goes to idle state (see Note)
B. Incoming Call
1. CO Applies Ringing Voltage
a. PBX Response: Detect ringing current
2. PBX Off-Hook (Answer Message): Close loop
a. CO Response: Trip ringing, provide loop current
1. Where P is the port network number (1 for PPN, 2 for EPN, and 3 for the second EPN); C
is the carrier designation (for example, A, B, C, D, or E); and SS is the address of the slot
in the carrier where the circuit pack is located (for example, 01, 02, ...etc.).
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.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run
1
Full Name of MO
DIOD-TRK MAJOR
2
test port PCSSpp l DIOD Trunk
DIOD-TRK MINOR test port PCSSpp l DIOD Trunk
DIOD-TRK WARNING test port PCSSpp l DIOD Trunk