16
REMOTE MINIBRIDGE
asynchronously at up to 115.2 Kbps if you tie some of the
unit’s DB25 pins to ground (see Table 2-1 below). The
RMB can internally generate seven standard asynchron-
ous frequencies (9.6, 14.4, 19.2, 28.8, 38.4, 57.6, and
115.2 Kbps), or it can derive a different asynchronous
data rate by dividing by sixteen the frequency of a sync
signal on Pin 15. For example, if you want the RMB to
communicate asynchronously at 4800 bps, the device
attached to its WAN side has to provide a sync signal
at 4800 x 16 (= 76,800) bps on Pin 15.
Table 2-1. Grounding for asynchronous control.
Data Rate or
DB25 Pin 6
DB25 Pin 8
DB25 Pin 17
DB25 Pin 22
Feature
Grounded?
Grounded?
Grounded?
Grounded?
Follow ext. clock
Yes
Yes
Yes
N/A
(sync on Pin 15)
115.2 Kbps
Yes
Yes
No
N/A
57.6 Kbps
Yes
No
Yes
N/A
38.4 Kbps
Yes
No
No
N/A
28.8 Kbps
No
Yes
Yes
N/A
19.2 Kbps
No
Yes
No
N/A
14.4 Kbps
No
No
Yes
N/A
9.6 Kbps (default)
No
No
No
N/A
ACCM enabled
N/A
N/A
N/A
No
(default)
ACCM disabled
N/A
N/A
N/A
Yes
