Line interface units
The analog message waiting line card contains 16 identical and independently configurable
line interface units (also referred to as circuits). Each unit provides 600-ohm impedance
matching and a balance network in a signal transformer/analog hybrid circuit. Circuits are also
provided in each unit to apply the ringing voltage onto the line synchronized to the ringing
current zero crossing. Signal detection circuits monitor on-hook/off-hook status and switchhook
flash detection. Four codecs are provided to perform A/D and D/A conversion of line analog
voiceband signals to digital PCM signals. Each codec supports four line interface units. The
following features are common to all units on the card:
• Transmission and reception of Scan and Signaling Device (SSD) signaling messages
over a DS30X signaling channel in A10 format.
• Loopback of SSD messages and pulse code modulation (PCM) signals for diagnostic
purposes.
• Correct initialization of all features, as configured in software, at power-up.
• Direct reporting of digits dialed (500 telephones) by collecting dial pulses.
• Connection of –150 V DC at 1 Hz to activate message waiting lamps in two telephones
in parallel. The two telephones must be the same type or the neon series resistor in each
telephone must be 54 K ohms or greater.
• Lamp status detection (does not detect a failure of either lamp when operating in
parallel).
• Disabling and enabling of selected units for maintenance.
• 40 mA to telephones with short circuit protection.
Card control functions
Control functions are provided by the following:
• a microcontroller
• a card LAN interface
• signaling and control circuits on the analog message waiting line card
NT8D09 Analog Message Waiting Line card
368 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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