14
MINISTAT-FOUR
Figure 3-1. Identification of internal jumpers.
3.4 Cable Connections
The MiniStat-Four has five top-mounted standard DB25 connectors. Main-channel
and sub-channel cables connect directly to these connectors.
3.4.1 S
UB
-C
HANNEL
C
ONNECTIONS
MiniStat-Four sub-channel interfaces are configured as data communication
equipment (DCE) interfaces, so they connect directly to data terminal equipment
(DTE) via RS-232 port cables. When modems extend range (as in tail-end circuits),
crossover cables are required. Sub-channel interfaces are asynchronous, so clock
signals are not required or supported.
ON
OFF
PIN 21
GND
CONNECT
DISCONNECT
INIT
INIT
NOR
NOR
C
D
SUB-2
SUB-1
POWER
JACK
J-1
SUB-3
SUB-4
