15
PA-2JT2 6.3-MHz Serial Port Adapter Installation and Configuration
OL-3587-01
VIP2 and the JT2 Port Adapter
Figure 10
Connecting 75-Ohm Coaxial BNC Cables (Horizontal Orientation Shown)
Note
Older A-type DSUs are not supported with PA-2JT2.
Step 2
Referring to , attach the network ends of your two 75-ohm coaxial cables to your external DSU as
follows:
–
Attach the coaxial cable from the JT2 port adapter’s TX0 port to the RX port on your external
DSU.
–
Attach the coaxial cable from the JT2 port adapter’s RX0 port to the TX port on your external
DSU.
Caution
To prevent system problems and to maintain the proper connection sequences (PA-2JT2’s RX port to the
DSU’s TX port and PA-2JT2’s TX port to the DSU’s RX port), connect the RX and TX ports on the JT2
port adapter as indicated in Steps 1 and 2.
Step 3
Make the appropriate setting on your DSU to establish an external ground. (See .) Remember that the
JT2 port adapter’s TX and RX connections are grounded at the router-chassis side.
Caution
To prevent system grounding and signal problems, your DSU
must
be set to accept an external ground
because the JT2 port adapter’s TX and RX connections are grounded at the router-chassis side.
ENABLED
AIS
RAI
LOS
AIS
RAI
LOS
JT2
H9372
TX0
RX0
TX1
RX1
To DSU's
RX port
BNC cables
To DSU's
TX port
