Services Supported By Diod Trunks - Avaya G350 Maintenance Manual

Services Supported by DIOD Trunks

Direct inward and outward dial (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
MM711 trunk Media Modules provide eight ports for loop-start CO trunks.
Loop Start Operation
Idle State: Tip = ground, Ring = CO Battery
Outgoing Call
1
PBX Off-Hook (Seize Message): Closes the Tip-Ring Loop CO Response: DC loop current +
Dial tone.
2
PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO Response: CO goes to
idle state (see Note).
Incoming Call
1
CO Applies Ringing Voltage PBX Response: Detect ringing current.
2
PBX Off-Hook (Answer Message): Close loop CO Response: Trip ringing, provide loop current.
3
PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO Response: CO goes to
idle state (see Note).
Direct Inward Dialing (DID)
1
CO Applies Ringing Voltage.
a
PBX Response: Detect ringing current and close loop.
b
CO Response: Send DTMF digits.
c
PBX Response: Acknowledge of Number dialed and open loop.
2
PBX Off-Hook (Answer Message): Close loop CO Response: Trip ringing, provide loop current.
3
PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO Response: CO goes to
idle state (see Note).
NOTE:
CO does not normally provide an On-Hook (Disconnect) signal.
Maintenance of the Avaya G350 Media Gateway
June 2004
Avaya Communication Manager controlled maintenance
DIOD-TRK (DIOD Trunk)
131