AT&T 610 - Dedicated Private Line Systems

Ccmaunications
Page 9- 2
User's Guide
August 1985
T
1
·
ERMINA .. L _____ )-+ Goes off-hook. HOr
T
T g~t:dtfPo~e~diaIS. --------------,,~
. ~ ~----07tH./ ..
If:,,;.....------- Sends off-hook signal. (-
t~ Waits 1 second.
If-;.....-------Sends mark (2225 Hz) to disable
echo suppressors.
l I
.1 L _T .......... .;.It-· ----::.,::::::::::~, ( G' .
unless se!1ding data.
This actiori permits full
duplex
on 2 wire lines.
Figure 9-2. On-Line Hode.-to-Hoda. Action
Dedicated Private Line Systems
Figure 9-3.,. Dedicated Line
FRONT
END
PROCESSOR
REMOTE
SENDER
HOST
Private line point-to-point systems using dedicated
telephone lines are generally used with full duplex modems at
speeds of 2400 bps and above. Conditioned lines are required
for higher rate analog or digital modem transmission.
MUltiplexed Front End Systems
FRONT
END. HOST
PROCE-
SSOR
, EIA 5~ FEET
Figure 9-4. Terainals Multiplexed