does the opposite: receives BPRZ-AMI bitstreams from the TCM loop and multiplexes the
integrated voice and data bitstream onto the DS-30X Rx channel.
The 4-wire to 2-wire conversion circuit converts the 2-wire tip and ring leads into a 4-wire (Tx
and ground and RX and ground) signal that is compatible with the digital line interface
circuit.
TCM loop interfaces
Each digital phone line terminates on the 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 power for the digital telephone.
Figure 5: Digital line interface unit block diagram
To prevent undesirable side effects from occurring when the TCM loop interface cannot provide
the proper signals on the digital phone line, the system controller can remove the ±15 V dc
power supply from the TCM loop interface. This happens when either the card gets a command
from the NT8D01 Controller card to shut down the channel, or when the digital line card detects
a loss of the 1 KHz frame synchronization signal.
Each TCM loop interface circuit can service loops up to 3500 ft. in length when using 24 gauge
wire. The circuit allows for a maximum ac signal loss of 15.5 dB at 256 KHz and a maximum
DC loop resistance of 210 ohms.
Signaling
The digital line interface units also contain signaling and control circuits that establish, monitor,
and take down call connections. These circuits work with the system controller to operate the
digital line interface circuits during calls. The circuits receive outgoing call signaling messages
Overview
42 Circuit Card Reference
July 2011
Summary of Contents for 1000 Series
Page 1: ...Circuit Card Reference Nortel Communication Server 1000 7 0 NN43001 311 04 04 July 2011 ...
Page 20: ...20 Circuit Card Reference July 2011 ...
Page 30: ...Introduction 30 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 116: ...Option settings 116 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 143: ...Figure 25 CP PIV card front Physical description Circuit Card Reference July 2011 143 ...
Page 148: ...NT4N39AA CP Pentium IV Card 148 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 287: ...Figure 86 Clock Controller Option 3 Operation Circuit Card Reference July 2011 287 ...
Page 302: ...NT5K21 XMFC MFE card 302 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 346: ...NT6D80 MSDL card 346 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 353: ...Figure 96 NTDK16 DLC Functional description Circuit Card Reference July 2011 353 ...
Page 461: ...Figure 147 Paging trunk operation Applications Circuit Card Reference July 2011 461 ...
Page 462: ...NT8D15 E and M Trunk card 462 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 500: ...NTAK09 1 5 Mb DTI PRI card 500 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 512: ...NTAK10 2 0 Mb DTI card 512 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 534: ...NTAK79 2 0 Mb PRI card 534 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 550: ...NTBK22 MISP card 550 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 560: ...NTBK50 2 0 Mb PRI card 560 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 595: ...Figure 165 MGC block diagram Introduction Circuit Card Reference July 2011 595 ...
Page 662: ...NTRB21 DTI PRI DCH TMDI card 662 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 668: ...NTVQ01xx Media Card 668 Circuit Card Reference July 2011 Comments infodev avaya com ...
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