Digital line interfaces
The digital line interface contains two Digital Line Interface Circuits (DLIC). Each digital line
interface circuit provides eight identical, individually configurable voice and data interfaces to
eight digital telephone lines. These lines carry multiplexed PCM voice, data, and signaling
information as TCM loops.
The purpose of each digital line interface circuit is to de-multiplex data from the DS-30X Tx
channel into eight integrated voice and data bitstreams. The circuits then transmit those
bitstreams as Bi-Polar Return to Zero, Alternate Mark Inversion (BPRZ-AMI) data to the eight
TCM loops. They also perform the opposite action: they receive eight BPRZ-AMI bitstreams
from the TCM loops and multiplex them onto the DS-30X Rx channel. The two digital line
interface circuits perform the multiplexing and de-multiplexing functions for the 16 digital
telephone lines.
The digital line interface circuits also contain signaling and control circuits that establish,
supervise, and take down call connections. These circuits work with the on-card microcontroller
to operate the digital line interface circuits during calls. The circuits receive outgoing call
signaling messages from the Call Server and return incoming call status information to the Call
Server over the DS-30X network loop.
TCM loop interface circuit
Each digital telephone line terminates on the NT8D02 Digital Line card at a TCM loop interface
circuit. The circuit provides transformer coupling and foreign voltage protection between the
TCM loop and the digital line interface circuit. It also provides battery voltage for the digital
telephone.
To prevent undesirable side effects from occurring when the TCM loop interface cannot provide
the proper signals on the digital phone line, the card microcontroller can remove the ±15 V dc
power supply from the TCM loop interfaces. This happens when either the microcontroller gets
a command from the NT8D01 controller card to shut down the channel, or the digital line card
detects a loss of the 1 KHz frame synchronization signal. The ±15 V dc power supply signal is
removed from all 16 TCM loop interface units at the same time.
Each TCM loop interface circuit can service loops up to 3500 ft. in length when using 24-gauge
wire. They support a maximum ac signal loss of 15.5 dB at 256 KHz and a maximum dc loop
resistance of 210 ohms.
Card control functions
Control functions are provided by a microcontroller and a Card LAN link on the digital line card.
A sanity timer is provided to automatically reset the card if the microcontroller stops functioning
for any reason.
Functional description
Circuit Card Reference
July 2011 355
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: ......