
Page 588 of 906
NT8D14 Universal Trunk card
553-3001-211 Standard 3.00 August 2005
Figure 126
Two-way, loop DR, TIE trunk call connection sequence – incoming call from far-end PBX
A
State
Idle
Idle
Trunk seizure
Outpulsing
A rings
B goes on hook
Idle
A goes on hook
Remarks
Signal/direction
Near end
System
B
Far end
System
Address signaling
High-resistance loop
Ground on tip/
battery on ring
Ground on tip/
battery on ring
Ground on tip/
battery on ring
Ground on tip/
battery on ring
Ground on tip/
battery on ring
Low-resistance loop
Ground on tip/
battery on ring
Far end places a low resistance between tip and ring.
Near end detects increase in loop current and makes
trunk busy to all outgoing calls.
Far end applies addressing to the trunk in the form of
battery-ground or loop pulsing, or DTMF tones.
Near end detects addressing, alerts terminal A, and
provides ringback tone to far end.
When terminal A goes off hook, near end trips ringback
tone and provides answer supervision, if required by far
end, by reversing battery and ground on tip and ring.
If far end disconnects first, it momentarily opens the loop
and then restores normal battery and ground if no near-
end answer supervision was provided when call was
establish-ed. Otherwise, it waits for the near end to
restore normal battery and ground.
Near end detects drop in loop current and restores normal
battery and ground if answer supervision was provided.
Otherwise, terminal A simply hangs up.
If answer supervision was provided, far end restores
normal battery and ground when it detects
battery/ground reversal from near end.
2-way voice
connection
Battery on tip/
ground on ring
Ringback
If near end disconnects first, normal battery is restored if
answer supervision was provided to establish call.
Otherwise, terminal A simply hangs up.
If far end detects battery/ground reversal, it
momentarily opens loop and then restores normal
battery. But, if no answer supervision was provided by
the near end when the call was established, it cannot
supply a battery reversal to signal call termination; the
person at terminal B must recognize end of call and
hang up, which will then cause the far end to restore
normal battery.
553-AAA1140
Содержание Circuit Card
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Страница 4: ...Page 4 of 906 Revision history 553 3001 211 Standard 3 00 August 2005...
Страница 18: ...Page 18 of 906 Contents 553 3001 211 Standard 3 00 August 2005...
Страница 78: ...Page 78 of 906 Overview 553 3001 211 Standard 3 00 August 2005...
Страница 100: ...Page 100 of 906 Acceptance tests 553 3001 211 Standard 3 00 August 2005...
Страница 156: ...Page 156 of 906 Option settings 553 3001 211 Standard 3 00 August 2005...
Страница 192: ...Page 192 of 906 NT4N39AA CP Pentium IV Card 553 3001 211 Standard 3 00 August 2005...
Страница 248: ...Page 248 of 906 NT5D11 and NT5D14 Lineside T1 Interface cards 553 3001 211 Standard 3 00 August 2005...
Страница 378: ...Page 378 of 906 NT5K21 XMFC MFE card 553 3001 211 Standard 3 00 August 2005...
Страница 384: ...Page 384 of 906 NT6D70 SILC Line card 553 3001 211 Standard 3 00 August 2005...
Страница 388: ...Page 388 of 906 NT6D71 UILC Line card 553 3001 211 Standard 3 00 August 2005...
Страница 533: ...NT8D02 and NTDK16 Digital Line cards Page 533 of 906 Circuit Card Description and Installation Figure 106 NTDK16 DLC...
Страница 544: ...Page 544 of 906 NT8D02 and NTDK16 Digital Line cards 553 3001 211 Standard 3 00 August 2005...
Страница 546: ...Page 546 of 906 NT8D03 Analog Line card 553 3001 211 Standard 3 00 August 2005...
Страница 564: ...Page 564 of 906 NT8D09 Analog Message Waiting Line card 553 3001 211 Standard 3 00 August 2005...
Страница 626: ...Page 626 of 906 NT8D14 Universal Trunk card 553 3001 211 Standard 3 00 August 2005...
Страница 680: ...Page 680 of 906 NT8D41AA Serial Data Interface Paddle Board 553 3001 211 Standard 3 00 August 2005...
Страница 694: ...Page 694 of 906 NT8D41BA Quad Serial Data Interface Paddle Board 553 3001 211 Standard 3 00 August 2005...
Страница 720: ...Page 720 of 906 NTAK09 1 5 Mb DTI PRI card 553 3001 211 Standard 3 00 August 2005...
Страница 734: ...Page 734 of 906 NTAK10 2 0 Mb DTI card 553 3001 211 Standard 3 00 August 2005...
Страница 744: ...Page 744 of 906 NTAK20 Clock Controller daughterboard 553 3001 211 Standard 3 00 August 2005...
Страница 762: ...Page 762 of 906 NTAK79 2 0 Mb PRI card 553 3001 211 Standard 3 00 August 2005...
Страница 768: ...Page 768 of 906 NTAK93 D channel Handler Interface daughterboard 553 3001 211 Standard 3 00 August 2005...
Страница 772: ...Page 772 of 906 NTBK22 MISP card 553 3001 211 Standard 3 00 August 2005...
Страница 844: ...Page 844 of 906 NTVQ01xx Media Card 553 3001 211 Standard 3 00 August 2005...
Страница 850: ...Page 850 of 906 NTVQ55AA ITG Pentium card 553 3001 211 Standard 3 00 August 2005...
Страница 884: ...Page 884 of 906 QPC841 Quad Serial Data Interface card 553 3001 211 Standard 3 00 August 2005...
Страница 906: ...Page 906 of 906 Appendix A LAPB Data Link Control protocol 553 3001 211 Standard 3 00 August 2005...
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