IBM System/34 Maintenance Manual page 507

31-500
DIGITAL DATA SERVICE ADAPTER
The Digital Data Service Adapter cards in· A-A2H2 (line
1) and A-A2H4 (line 2) have five jumper locations;
attach these jumpers as instructed in Figure 31-28.
I
A-A2H2 (line 1); A-A2H4 (line 2)
A - Needed for 2,400 bps Operation (see Note)
B - Needed for 4,800 bps Operation (see Note)
C - Needed for 9,600 bps Operation (see Note)
0- Not used
• E •
J
. E - Needed for multipoint operation. (disables the channel
service unit loop-back)
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.
Figure 31-28. Card Jumpers for the Digital Data Service
Adapter
48
31-500
31-600
EIA/CCITT INTERFACE
31-610
Card Jumpers
The EIA/CCITT cards in A-A2H2 (line 1) and A-A2H4
(line 2) have 10 jumper locations but none of the
jumpers are needed.
If you have a multipoint control modem that needs
new
sync, the following jumpers are added for each line:
l
Line
'j
Line 2
A-A2H4G08
A-A2H4G08
• A •
• c •
• A •
to
to
• B •
A-A2K1B11
A-A2K6B02
• A •
I
A-A2H2 (line 1); A-A2H4 (line 2)
A Not used or missing (four locations)
B Not used
C Not used
D Not used
E Not used
F Not used
G Not used
~
(
'.
\_
.....