Meridian America 61 Manual De Usuario

SSD in SL-1 set sends off-hook signaling to

line circuit on signaling pair.

Off-hook signaling data on data input bus during time slot   (via

multiplex control and buffer).

CE detects signaling.

CE changes visual signaling on data output bus during time slot 0.
Visual signaling is applied to 

 set on signaling pair. Line lamp

of SL-1 set changes from flashing to steady light,

CE removes audible signaling from data output bus during message
time

slot (message time slot now assigned for voice

communications).

Audible signaling at SL-1 set stops.

PCM codec is enabled during message time

slot.

(1) Digital voice on data output bus is applied to SL-1 set via

multiplex control, PCM codec, digital-to-analog filter, hybrid 
transformer, and audio pair.

 Analog voice from SL-1 set is applied to data input bus via audio

pair, hybrid transformer, analog-to-digital filter, PCM codec,
multiplex control, and buffer.

Assume SL-1 is put on-hook first.

SSD transmits on-hook message to line circuit.

(2) On-hook message transmitted to CE through data input bus during

time slot 0 at a rate of 64K bit/s.

( 3 )

CE detects a change in signaling.

(4) Signaling on data output bus changes; SL-1 set line lamp

extinguishes.

ADD inputs are removed (no signaling for line circuit 0).

Enable inputs are removed (message time slot no longer is assigned

to line circuit 

Circuitry in IDLE condition: ready for next call.

4.09 All calls originating from and terminating on stations connected to
line and trunk circuits may be controlled with or without attendant
assistance. Call restrictions to the exchange network and special services,
are assigned through unique station/line circuit data blocks contained in

the system memory. Similarly, feature assignments are arranged through
the same data blocks. Refer to 

 for a complete list and

description of features and services. Refer to 

 for a

description of how features and services are created in the system
memory.