The Model 1205RC has six jumpers (JP1,thru JP6) mounted on
the PC board (see Figure 4, below). These jumpers set clocking, carri-
er, and RTS/CTS delay independently for ports A and B.
JP1: RTS/CTS Delay (Port A)
The setting for jumper JP1 determines–with respect to Port A– the
amount of delay between the time the Model 1205RC “sees” RTS and
when it sends CTS. In order to emulate either dial-up or leased line
modems, you can set this strap at either 0 msec, 7 msec or 53 msec.
JP1
Setting
Position 1&2
7 msec Delay (factory default)
Position 2&3
53 msec Delay
Strap Removed
0 msec Delay
JP6: RTS/CTS Delay (Port B)
The setting for jumper JP6 determines–with respect to Port B– the
amount of delay between the time the Model 1205RC “sees” RTS and
when it sends CTS. In order to emulate either dial-up or leased line
modems, you can set this strap at either 0 msec, 7 msec or 53 msec.
JP6
Setting
Position 1&2
7 msec Delay (factory default)
Position 2&3
53 msec Delay
Strap Removed
0 msec Delay
6
Figure 4.
Jumper locations on Model 1205RC front card
JP2
JP1 JP3
JP6
JP4
JP5
4.3 HOST (DTE) CONNECTION
The Model 1205RC rear card has two UD-26 connectors, labeled
“A1” and “B1” (see figure 7, below). These correspond to host (DTE)
connection Port A and Port B, as discussed in Section 3.0.
To connect V.35 host (DTE) devices A and B to the Model
1205RC, follow these instructions:
1. Configure the Model 1205RC for your specific application accord-
ing to the instructions in
Section 3.0
of this manual.
2. Connect host devices A and B to the Model 1205RC using multi-
pair adapter cables (see
Appendix B
for a list of custom adapter
cables available from Patton Electronics). Observe the following
conditions when making connections :
a)
Each multipair cable must not exceed 150 feet in length
(see Figure 8, below).
b)
If external clock is used, the host (DTE) device supplying the
clock must be connected to Port A. The Model 1205RC
cannot receive an external clock on Port B (see Section 3.0
for configuration details).
c)
If receive clock is used on Port B, Port A must supply an
external clock (see Section 3.0 for configuration details).
11
Notice!
Any terminal cable connected to the Model
1205RC must be shielded cable, and the outer shield must
be 360 degree bonded–at both ends–to a metal or metal-
ized backshell.
Figure 7.
Model 1205RC rear interface card, showing connectors
A1 B1
