Demand test descriptions and error codes - Avaya Support

Ground Start Operation
CO-TRK (Analog CO Trunk)
Idle state:
Tip = open, Ring = CO Battery
Outgoing Call:
PBX Off-Hook (Seize message): Places ground on Ring
CO response: Places ground on Tip
PBX response: Close the loop
CO response: Provide loop current
PBX response: Dial out digits
PBX On-Hook first (Drop message): Open the Tip-Ring Loop, no loop current
CO response: Open circuit on Tip
CO On-Hook first (Disconnect): Open circuit on Tip, no loop current
PBX response: Open Tip-Ring loop
Incoming Call:
CO Off-Hook (Seizure): CO applies ground on Tip and applies ringing voltage to the Ring
lead.
PBX response: Make trunk busy for outgoing calls
CO Ringing: CO applies ringing voltage to the Ring lead.
PBX response: Detect ringing, ring destination (Attendant, hunt group, etc.)
PBX Off-Hook (Answer message): Close loop
CO response: Trip ringing, provide loop current
PBX On-Hook first (Drop message): Open the Tip-Ring Loop, no loop current
CO response: Open circuit on Tip
CO On-Hook first (Disconnect): Open circuit on Tip, no loop current
Issue 5 May 2009 283