Nortel Meridian SuperNode SL-100 Reference Manual page 33

to the controller card through a DS30X interface that carries multiplexed PCM
voice and data information from the 16 sets (32 ports). The CARD-LAN serial
bus carries control and maintenance messages between the controller card and
DLC.
Analog Line Card (NT8D03)
The Analog Line Card (ALC) is an analog line card that interfaces with the
controller card. The ALC allows analog sets such as 500 and 2500 sets to
receive and make telephone calls. The ALC can be inserted into any line card
slot in the IPE shelf.
Note: In later configurations of the IPE, MLCs or LTIs are used instead of
ALCs. (Refer to the "Analog Message Waiting Line Card" section in this
chapter.)
Each ALC supports a maximum of 16 analog sets (500/2500) and can support
the SL-100 attendant console. The ALC is equipped with an Intel 8051-type
microprocessor that performs functions such as control of card operation, card
identification, self-test, status reporting to the controller, and maintenance
diagnostics.
The ALC provides the following functions:
• analog-to-digital and digital-to-analog conversion for the possible 16
analog telephone sets
• transmit and receive signaling messages over a DS30X time slot
• DC current to the telephone sets
• on hook/off hook detection
• connection for ringing signal through the ringing generator
• status of board
• tip and ring conductor with balanced 600 ohm termination
• self ID and vintage ID
Analog Message Waiting Line Card (NT8D09)
The MLC is basically an ALC that supports the message waiting lamp sets in
addition to the 500/2500 sets. The MLC functions the same as the ALC
previously listed and also provides the following additional functions:
• current limited connection for the message waiting lamp on the set
• flashing of the 1-Hz message waiting lamp signal at 150 V dc
• support for both A- and Mu-law companding
• method to test the lamp on the set
Meridian SuperNode MSL-100 Intelligent Peripheral Equipment (IPE) Reference Manual MSL14
IPE architecture 2-9