State
Transmit
Receive
A
B
A
B
Far end disconnects by dropping loop current and Lineside
T1 card changes Transmit A bit to 1 momentarily.
1
1
1
1
Terminal equipment responds causing Receive A bit to
change to 0.
1
1
0
1
Lineside T1 responds by changing its Transmit A bit to 0. Call
is terminated and set to idle state.
0
1
0
1
Call disconnect from terminal equipment:
Steady state (call in progress)
0
1
1
1
Terminal equipment goes on-hook causing the Receive A bit
to change to 0. Call is terminated and set to idle state.
0
1
0
1
Ground Start Mode
In Ground Start mode, the A and B bits meaning is:
• Transmit from LTI:A bit = Tip ground (0=grounded, 1=not grounded); B bit = Ringing (0=on,
1=off)
• Receive to LTI: A bit = Loop (0=open, 1=closed); B bit = Ring ground (0=grounded, 1=not
grounded)
When a T1 channel is idle, the Lineside T1 card simulates a ground on the tip lead and -48V
dc on the ring lead to the terminal equipment by setting the transmit A bit to 1 and transmit B
bit to 1. Accordingly, an on-hook telephone simulates an open loop toward the Lineside T1
card, causing the Lineside T1 card's receive bits to be set to A = 0 and B = 1.
Incoming Calls
Incoming calls to terminal equipment that is connected to the Lineside T1 card can originate
either from stations that are local (served by the PBX), or remote (served through the public
switched telephone network). To provide the ringing signal to the terminal equipment the
Lineside T1 card simulates the 90V ring signal on the ring lead by alternating the transmit B
bit between 0 and 1 (0 during ring on, 1 during ring off), and ground on the tip lead by setting
the transmit A bit to 0. When an incoming call is answered (by the terminal equipment going
off-hook), the terminal equipment simulates tripping the ringing and shutting off ringing by
causing the lineside T1's receive A bit to change from 0 to 1. The Lineside T1 card responds
to this message by simulating loop closure by holding the transmit B bit constant at 1.
Outgoing Calls
During outgoing calls from the terminal equipment, a channel is seized when the terminal
equipment goes off-hook, simulating a ground to the ring lead toward the Lineside T1 card by
causing the lineside T1's receive B bit to change from 1 to 0. In turn, the Lineside T1 card
simulates grounding its tip lead by changing the transmit A bit to 0. The terminal equipment
responds to this message by removing the ring ground (lineside T1's receive B bit is changed
Overview
52 Circuit Card Reference
July 2011
Содержание 1000 Series
Страница 1: ...Circuit Card Reference Nortel Communication Server 1000 7 0 NN43001 311 04 04 July 2011 ...
Страница 20: ...20 Circuit Card Reference July 2011 ...
Страница 30: ...Introduction 30 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 116: ...Option settings 116 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 140: ...NT1R20 Off Premise Station Analog Line card 140 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 143: ...Figure 25 CP PIV card front Physical description Circuit Card Reference July 2011 143 ...
Страница 148: ...NT4N39AA CP Pentium IV Card 148 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 244: ...NT5D33 and NT5D34 Lineside E1 Interface cards 244 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 252: ...NT5D60 80 81 CLASS Modem card XCMC 252 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 269: ...Figure 79 DDP2 cable for systems with an I O panel Physical description Circuit Card Reference July 2011 269 ...
Страница 287: ...Figure 86 Clock Controller Option 3 Operation Circuit Card Reference July 2011 287 ...
Страница 292: ...NT5D97 Dual port DTI2 PRI2 card 292 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 302: ...NT5K21 XMFC MFE card 302 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 346: ...NT6D80 MSDL card 346 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 353: ...Figure 96 NTDK16 DLC Functional description Circuit Card Reference July 2011 353 ...
Страница 361: ...Figure 98 Digital line card jumper block and switch locations Configuration Circuit Card Reference July 2011 361 ...
Страница 362: ...NT8D02 and NTDK16 Digital Line cards 362 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 378: ...NT8D09 Analog Message Waiting Line card 378 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 393: ...Figure 111 Ground start call states outgoing call to CO FX WATS Operation Circuit Card Reference July 2011 393 ...
Страница 461: ...Figure 147 Paging trunk operation Applications Circuit Card Reference July 2011 461 ...
Страница 462: ...NT8D15 E and M Trunk card 462 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 500: ...NTAK09 1 5 Mb DTI PRI card 500 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 512: ...NTAK10 2 0 Mb DTI card 512 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 534: ...NTAK79 2 0 Mb PRI card 534 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 550: ...NTBK22 MISP card 550 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 560: ...NTBK50 2 0 Mb PRI card 560 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 566: ...NTBK51 Downloadable D channel Handler daughterboard 566 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 584: ...NTCK16 Generic Central Office Trunk cards 584 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 595: ...Figure 165 MGC block diagram Introduction Circuit Card Reference July 2011 595 ...
Страница 616: ...NTDW56 and NTDW59 Common Processor Media Gateway card 616 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 642: ...NTDW61 and NTDW66 Common Processor Pentium Mobile Card 642 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 662: ...NTRB21 DTI PRI DCH TMDI card 662 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 668: ...NTVQ01xx Media Card 668 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 676: ...NTC314AAE6 Media Gateway utility card 676 Circuit Card Reference July 2011 Comments infodev avaya com ...
Страница 700: ......