AT&T 518-600-016 manual 150 …

Each module has a DSE to interface codecs or digital transceivers to the TDM bus. The actual digital switching occurs when the DSE is programmed by the system I/O bus to place (transmit) data or retrieve (receive) data on the TDM bus in specific time slots. This process also involves time slot interchanging so that an available slot in the TDM cycle can be filled with a talk (transmit) or listen (receive) slot. The DSE provides dynamic conferencing ability by allowing up to 16 time slots to be conference together and sent out to a single port (station).

DSE

408 Module

CODEC

D / A converter

A / D

converter

i n t e r f a c e

Analog voice terminal

DSE

008D Module

Interface circuity

TDM Bus

256 Time slots in one TDM cycle

0

1

2

3

…

60 61 62 63

…

150…

160

…

200…

220…

225

Time

Time slots	Time slots	Analog station	Digital station
for control	for tones.	talks on time	sends data on
signals.		slot 150 and	time slot 200
		listens on time	and receives
		slot 160. The	data on time
		conversation	slot 220.
		is continuous.

FIGURE 1-10 Time division multiplexing.

Theory of Operation 1-43