DIOD-TRK (DIOD Trunk)

Table 25. DIOD-TRK (DIOD Trunk)

MO Name (in Alarm Log)	Alarm Level	Initial Command to Run*	Full Name of MO
DIOD-TRK	MAJOR**	test port GGGvSpp l	DIOD Trunk
DIOD-TRK	MINOR	test port GGGvSpp l	DIOD Trunk
DIOD-TRK	WARNING	test port GGGvSpp l	DIOD Trunk
Note: You must consult local records for the location and designation of the equipment rack where the G700 is mounted.
**A MAJOR alarm on a trunk indicates that alarms on these trunks are not downgraded by the set options command and that at least 75 percent of the trunks in this trunk group are alarmed.

Many trunk problems are caused by incorrect settings of parameters on the trunk group administration form. Settings must be compatible with the local environment and with parameter settings on the far-end. Refer to the Administration Manual for information on how to administer trunks. The Application Notes section of that book shows the correct settings for administrable timers and other parameters on a country-by-country basis.

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
• 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:

   CO does not normally provide an On-Hook (Disconnect) signal.