Description 5
NT5K02 and NT8D03 Analog Line Cards 553-3001-161
The analog line card also provides:
— 600-ohm balanced terminating impedance
— analog-to-digital and digital-to-analog conversion of transmission and
reception signals for 16 audio telephone lines
— transmission and reception of scan and signaling device (SSD)
signaling messages over a DS30X signaling channel in A10 format
— on-hook and off-hook status detection
— 20-Hz ringing signal connection and automatic disconnection when the
telephone goes off-hook
— synchronization for connecting and disconnecting the ringing signal to
zero crossing of ringing voltage
— 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
NT5K02 Flexible Analog Line Card (A-Law)
The NT5K02 Flexible Analog Line Card provides talk battery and
signalling for regular 2-wire common battery 500-type (rotary dial), 2500-
type (Digitone* dial) telephones and key telephone equipment. The
telephones may have either ground button recall switches, high voltage
message waiting lamps, or low voltage message waiting LEDs.
Application
The NT5K02 Flexible Analog Line Card is used as follows:
• NT5K02AA — High voltage message waiting analog line card
typically used in Australia.
• NT5K02DA — Ground button low voltage message waiting analog
line card typically used in France.
• NT5K02EA — Ground button low voltage message waiting analog line
card typically used in Germany.
