
Loop Start Mode
In Loop Start mode, the A and B bits meaning is:
• Transmit from LTI:A bit = 0 (tip ground on); B bit = Ringing (0=on, 1=off)
• Receive to LTI: A bit = Loop (0=open, 1=closed); B bit = 1 (no ring ground)
When a T1 channel is idle, the Lineside T1 card simulates a ground on the tip lead and –48Vdc
on the ring lead to the terminal equipment by setting its transmit A bit to 0 and transmit B bit
to 1. Accordingly, an on-hook channel on the terminal equipment simulates an open loop
toward the Lineside T1 card, causing the Lineside T1 card's receive bits to be set to A = 0 and
receive B = 1.
Incoming calls
Incoming calls to terminal equipment attached to the Lineside T1 card can originate either from
stations that are local (served by the PBX), or remote (served through the PSTN). To provide
the ringing signal to a telephone the Lineside T1 card simulates an additional 90V on the ring
lead to the terminal equipment by alternating the transmit B bit between 0 and 1 (0 during ring
on, 1 during ring off). When an incoming call is answered by the terminal equipment going off-
hook, the terminal equipment simulates tripping the ringing and shutting off ringing, causing
the Lineside T1 card's receive A bit to be changed from 0 to 1.
Outgoing calls
During outgoing calls from the terminal equipment, a channel is seized when the station goes
off-hook. This simulates a low-resistance loop across the tip and ring leads toward the Lineside
T1 card, causing the lineside T1's receive A bit to be changed from 0 to 1. This bit change
prepares the Lineside T1 to receive digits. Outward address signaling is then applied from the
terminal equipment in the form of DTMF tones or loop (interrupting) dial pulses that are signaled
by the receive A bit pulsing between 1 and 0.
Call disconnect from far end PSTN, private network or local Station
When a call is in process, the central office may disconnect the call from the CS 1000E, CS
1000M, and Meridian 1. If the Lineside T1 port is configured with the supervised analog line
(SAL) feature, the Lineside T1 card responds to the distant end disconnect message by
momentarily changing its transmit A bit to 1 and then returning it to 0. The duration of time that
the transmit A bit remains at 1 before returning to 0 depends upon the setting that was
configured using the SAL. If the terminal equipment is capable of detecting distant end
disconnect, it responds by changing the Lineside T1 card's receive A bit to 0 (open loop). The
call is now terminated and the interface is in the idle (on-hook) state.
For the Lineside T1 card to support distant end disconnect in loop start mode, the following
configuration parameters must exist:
• The Supervised Analog Line (SAL) feature must be configured for each Lineside T1
port.
Overview
50 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: ......