Technician’s Handbook
76
Table 8: 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
termination: Loop Current
is broken
Summary of Contents for SX-200 EL
Page 1: ...TECHNICIAN S HANDBOOK LIGHTWARE 19 RELEASE 3 0 ...
Page 11: ...Chapter 1 Introduction ...
Page 12: ......
Page 32: ...Technician s Handbook 22 ...
Page 33: ...Chapter 2 Routine Maintenance ...
Page 34: ......
Page 55: ...Chapter 3 Troubleshooting and Repair ...
Page 56: ...Technician s Handbook 46 ...
Page 88: ...Technician s Handbook 78 Figure 16 E M Trunk Type I 2 wire ...
Page 110: ...Technician s Handbook 100 ...
Page 111: ...Chapter 4 Programming ...
Page 112: ......
Page 168: ...Technician s Handbook 158 ...
Page 169: ...Chapter 5 Installation ...
Page 170: ......
Page 239: ...Chapter 6 Maintenance Commands ...
Page 240: ......
Page 258: ...Technician s Handbook 248 ...
Page 261: ...Notes ...
Page 262: ...Technician s Handbook Notes ...