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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 10-302CO-TRK (CO Trunk)
10
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
3. PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current
a. CO Response: CO goes to idle state (see Note)
NOTE:
Except for the Netherlands Loop Start and UK Loop Calling Guarded
Clearing trunks, CO does not normally provide an On-Hook (Disconnect)
signal.
GROUND START AND UK EARTH CALLING OPERATION
Idle state - Tip _ open, Ring = CO Battery
A. 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
B. Incoming Call
1. CO Off-Hook (Seizure): CO applies ground on Tip, CO applies ringing
voltage
a. PBX Response: Detect ringing, ring destination
2. PBX Off-Hook (Answer Message): Close loop
a. CO Response: Trip ringing, provide loop current