Mitel 50005070 Instruction Manual download pdf (Page 266)

100

101

256

SX-200 ICP MX Technician’s Handbook

Test/Verify (DID)

• Verify the far-end circuits by the use of a standard telephone for

outgoing calls.

• Verify the near-end circuits by connecting to known working DID/Loop

circuits.

• Verify that appropriate voltages are present on Tip-Ring in each call

state.

• During off-hook condition, 20-25 mA should be drawn from the far-end.

Table 53: Direct Inward Dial/Loop Trunk Summary

Signal

DID/Loop Trunk PBX

Outgoing

DID/Loop Trunk PBX

Incoming

Seize Tip-Ring leads are activated

(shorted); Loop Current flows in

line

Tip-Ring leads are

activated (shorted); Loop

Current flows in line

Seize

Acknowledgment

Immediate Dial - Tip-Ring leads

stay active

Outgoing Wink - Tip-Ring leads

toggle

Loop Current direction Delay

Dial - Tip-Ring leads reverse

Loop Current following seizure;

reverse again when ready to go

Immediate Dial - Tip-Ring

leads stay active.

Incoming Wink - Tip-Ring

leads toggle Loop Current

direction

Digits Loop Current toggled (Rotary)

or DTMF

Loop Current toggled

(Rotary) or DTMF

Stop Dial Tip-Ring leads reverse Loop

Current direction; forward again

when ready

—

Receipt of Digits Audible Tones - Busy, Reorder,

Ringback dependent upon

digits dialed and called party

condition

Audible Tones - Busy,

Reorder, Ringback

generated and sent to

calling party dependent

upon digits received and

state of called party

Answer

Supervision

Current flow in Tip-Ring is

reversed

Current flow in Tip-Ring is

reversed

Disconnect

Supervision

Near or Far-end termination:

Loop Current broken

Near or Far-end termi-

nation: Loop Current is

broken

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