AT&T System 85 Installation And Test page 153

SWITCH
Si
DESCRIPTION
LOOP SWITCH: WHEN SWITCH IS IN
THE LOOP POSITION, IT CONNECTS
THE PCM OUT TO PCM IN/.
INDICATOR
MEANING WHEN ON
051 (YELLOW)
DS2 (GREEN)
0S3 (YELLOW)
DS4 (RED)
DS5 (RED)
DS6 (RED)
TRANSMIT DATA IS PRESENT.
REQUEST TO SEND IS ENABLED.
RECEIVE DATA IS PRESENT.
REQUEST TO SEND HAS BEEN RECEIVED.
LOOP SWITCH IS ACTIVATED.
INDICATES A BLOWN FUSE.
LOOP
Figure 90. Asynchronous Data Channel Unit Switch Locations and Setting
TX ATTEN RI ATTEN
DS5
DS1
=t
052=
DS3
r---t
DS41 - 1
DSC=
Si
.1
.2
.4
.8
1.6
3.2
6.4
12.8
EU
CM
EU
EU
56
57
IN 44--0. OUT
53
1200
600
150
.1
.2
.4
.8
1.6
3.2
6.4
12.8
N3
EU
Ell
Eli
EU
S8
S9
ON--0.
ON-0.
CI
IN
OUT
GROUND I—I BATTERY
S5
1
2
3
4
CM
CM
CM
CM
S10
DE PRESSED
Si TEST
SWITCH
2
TX{ TP6
1
IP
3 4 S2
TP3
5
TP4
6
TP- 7
RX { 1P8
DS1
nil
I OPTIONAL 1
I
JACKS
1
RCV
L
J
Figure 91. 30044-002 4
-Wire
E&M Channel Unit Switch Locations
Ti
R1
Page 137