
Overview
Page 55 of 906
Circuit Card
Description and Installation
Ground Start Restrictions
If the lineside T1 card is used in ground start mode, certain restrictions should
be considered. Because the system treats the lineside T1 card as a standard
loop start analog line card, the ground start operation of the lineside T1 card
has operational limitations compared to typical ground start interface
equipment relating to
start of dialing, distant end disconnect
and
glare
potential
.
•
Terminal equipment goes off-hook by simulating ground on tip
lead and ringing on ring lead.
0
0/1
1
1
Outgoing Calls (from terminal equipment):
•
Idle
1
1
0
1
•
Terminal equipment goes off-hook.
1
1
0
0
•
The lineside T1 simulates grounding its tip lead
0
1
0
0
•
Terminal equipment opens ring ground and closes loop
0
1
1
1
Call Disconnect from far end:
•
Steady state (call in progress)
0
1
1
1
•
The lineside T1 ungrounds tip
1
1
1
1
•
Terminal equipment opens loop current
1
1
0
1
Call disconnect from terminal equipment:
•
Steady state (call in progress)
0
1
1
1
•
Terminal equipment goes open loop current
0
1
0
1
•
Lineside T1 card opens tip ground
1
1
0
1
Table 5
Ground Start Call Processing A/B Bit Settings (Part 2 of 2)
State
Transmit
Receive
A
B
A
B
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...
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Страница 626: ...Page 626 of 906 NT8D14 Universal Trunk card 553 3001 211 Standard 3 00 August 2005...
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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...
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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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