IBM System/34 Maintenance Manual page 449

30-550 Card Jumpers
The Digital Data Service Adapter cards have five jumper
locations; attach these jumpers as instructed in Figure
30-24.
l
Line 1 A-B3L2
Line 2 A-B3M2
Line 3 A-B3L4
Line 4 A-B3M4
• E •
A Needed for 2400 bps operation (see note)
B Needed for 4800 bps operation (see note)
C Needed for
9600
bps operation (see note)
o
Needed for 56,000 bps operation (see note)
E Needed for multipoint operation (disables the
channel service unit loop-back)
I
Not used for point-to-point operation (enables
the channel service unit loop-back in test mode)
Note:
The bits-per-second rate must be set to the rate
specified in the customer's order for service to the
common carrier. Clocking is controlled by the common
carrier central office or by the adapter (local direct
attach). If 56,000 bps is specified, the communications
adapter card switch settings and configuration for this
line must be set for device address 80.
Figure 30-24. Card Jumpers for DDSA
40
I
'\.., ..... .
/ _
..
-
.....
,
\... .
.../'
30-550