ISL installation for all systems
Page 163 of 188
ISDN PRI Installation
identifies the signals sent from the pack to the modem, the signals
the pack requires from the modem, and the state of the modem.
Table 44
Pin assignment for D-channel RS-232 interface
PIN #
Description
Designation
Direction
State
EIA
CCITT
COM
MON
To
DTE
To
DCE
0
Space
On
1
Mark
Off
1
frame gnd
AA
101
FG
2
tx data
BA
103
TxD
X
+12V
–12V
3
rx data
BB
104
RxD
X
+12V
–12V
4
req to send
CA
105
RTS
X
+12V
–12V
5
clr to send
CB
106
CTS
X
+12V
–12V
6
data set rdy
CC
107
DSR
X
+12V
–12V
7
signal gnd
AB
102
SG
8
data cxr detect
CF
109
DCD
X
+12V
–12V
9–14
(not connected)
15
tx clock
DB
114
SCT
X
+12V
–12V
16
(not connected)
17
rx clock
DD
115
SCR
X
+12V
–12V
18–19
(not connected)
20
data term rdy
CD
108.2
DTR
X
+12V
–12V
21–22
(not connected)
23
data rate sel
CH
111
DRS
X
+12V
–12V
24
ext tx clock
DA
113
SCTE
X
+12V
–12V
25
(not connected)