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DIOD-TRK (DIOD Trunk)
Issue 1 June 2005 965
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) (Loop Start)
1. CO Applies Ringing Voltage
PBX Response: Detect ringing current and close loop
CO Response: Send DTMF digits
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:
Note: CO does not normally provide an On-Hook (Disconnect) signal.
Error Log Entries and Test to Clear Values
Table 332: DIOD Trunk Error Log Entries
Error
Type
Aux
Data
Associated Test Alarm
Level
On/Off
Board
Test to Clear Value
0 (a) 0 Any Any Any test port sh
15 (b
) any Port Audit Update test (#36)
18 0 busyout trunk grp/mbr WRN release trunk
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