DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-535DIOD-TRK (DIOD Trunk)
3
DIOD-TRK (DIOD Trunk)
Direct Inward and Outward Dial (TN429 DIOD) trunks are 2-wire analog lines to
the CO which support the follo wing services:
■both incoming and outgoing CO calls
■DID trunk
■DID Trunk and 1-way Outgoing DIOD
The DIOD Trunk circuit pack provides eig ht ports for loop-start CO. The ci rcuit
pack is an interface b etween 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: T rip ringing, provide loop current
MO Name (in
Alarm Log) Alarm Level Initial Command to Run1
1. Where P is the port network number (1 for PPN); C is the carrier designation (for example,
A, B, or C); and SS is the address of the slot in the carrier where the circuit pack is located
(for example, 01, 02, ...etc.).
Full Name of MO
DIOD-TRK MAJOR2
2. A MAJOR alarm on a trunk indicates th at alarms on these trunks are not downg raded by
the set options command and that at least 75 percent of the trunks in this trunk group
are alarmed.
test port PCSSpp l DIOD Trunk
DIOD-TRK MINOR test port PCSSpp l DIOD Trunk
DIOD-TRK WARNING test port PCSSpp l DIOD Trunk