Avaya Media Gateway G350, Руководство по обслуживанию

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Avaya Communication Manager controlled maintenance
CO-TRK (Analog CO Trunk)
Maintenance of the Avaya G350 Media Gateway 93
June 2004
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.
3
PBX On-Hook (Drop Message): Open Tip-Ring Loop, no Loop Current.
a
CO Response: CO goes to idle state (see Note).
NOTE:
CO does not normally provide an On-Hook (Disconnect) signal. Exceptions to this rule
include Netherlands loop start and UK loop-calling guarded-clearing.
Ground Start Operation
Idle state:
Tip = open, Ring = CO Battery
Outgoing Call:
1
PBX Off-Hook (Seize Message): Places ground on Ring.
a
CO Response: Places ground on Tip.
b
PBX Response: Close the loop.
c
CO Response: Provide loop current.
d
PBX response: Dial out digits.
2
PBX On-Hook first (Drop Message): Open the Tip-Ring Loop, no loop current.
a
CO Response: Open circuit on Tip.
3
CO On-Hook first (Disconnect): Open circuit on Tip, no loop current.
a
PBX Response: Open Tip-Ring loop.
Incoming Call:
1
CO Off-Hook (Seizure): CO applies ground on Tip and applies ringing voltage.
a
PBX Response: Make trunk busy for outgoing calls.
2
CO Ringing: CO applies ringing voltage.
a
PBX Response: Detect ringing, ring destination.
3
PBX Off-Hook (Answer Message): Close loop.
a
CO Response: Trip ringing, provide loop current.
4
PBX On-Hook first (Drop Message): Open the Tip-Ring Loop, no loop current.
a
CO Response: Open circuit on Tip.
5
CO On-Hook first (Disconnect): Open circuit on Tip, no loop current.