
NT8D14 Universal Trunk card
Page 583 of 906
Circuit Card
Description and Installation
Figure 122
Ground start call connection sequence – outgoing call to CO/FX/WATS
A
State
Idle
Idle
B rings
Trunk seizure
Dial tone from CO
B goes on hook
Idle
A goes on hook
Remarks
Signal/direction
Near end
System
B
Far end
CO
Tip open/
battery
on ring
Tip open/
battery on ring
Ringback
Tip open/
battery on ring
High-
resistance
loop
Ground on ring
When the CO recognizes seizure, it grounds the tip
and supplies dial tone.
When terminal B answers, ringing is tripped and CO
cuts terminal B through to trunk. Some COs may
reverse battery and ground on tip and ring when
terminal B answers or for toll denial.
Upon receipt of the first pulse/tone, the CO removes
dial tone. When outpulsing is complete, terminal B is
rung (if idle) and the proper audible indication is
returned to local end.
If far end disconnects first, CO removes ground from
tip. If battery and ground were reversed when call
was established, battery is removed from tip and
restored to ring.
Near end detects drop in loop current and opens loop.
Digits are outpulsed in the form of a series of loop
pulses or DTMF tones.
2-way voice
connection
Ground on tip/
battery on ring,
dial tone
Low-resistance loop
High-resistance loop
High-resistance loop
Address signaling
Detection of the ground on tip is signaled to the CE
via the data input bus. The CE then sends a signal via
the data output bus to place a low-resistance loop
across the tip and ring and remove ground from ring.
Terminal A dials trunk access code. CE sends a
message via the data output bus to ground the ring.
If near end disconnects first, it opens the loop.
CO detects drop in loop current and removes ground
from tip. If battery and ground were reversed when
call was established, battery is removed from tip and
restored to ring.
553-AAA1136
Содержание Circuit Card
Страница 2: ......
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...
Страница 907: ......