62
MINISTAT-FOUR
Table A-1 (continued). Pinout of the main (composite) channel connector.
CCITT V.24 TIA
PIN
SIGNAL
DESCRIPTION
CIRCUIT
RS-232C
NAME
NUMBER
LINE
114
DB
15
Transmitter
Transmit clock from modem.
Signal
Element
Timing
115
DD
17
Receiver
Receive clock from modem.
Signal
Element
Timing
141
—
18
Loop 3 Test
Control signal from
Command
MiniStat-Four. Positive
level commands the modem
into analog loopback.
108.2
CD
20
Data
Continuous positive level
Terminal
from MiniStat-Four.
Ready
140
—
21
Loop 3
Control signal from MiniStat-
Test
Four to modem. Positive
Command
level commands attached
modem to send a remote-
loopback command to the
remote modem.
If attached modem uses
Pin 21 as a signal-quality-
indication output, set the
Pin 21 jumper to OFF, thereby
disabling this function.
