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BB-L289B-RK
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strap.mem
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! d i g i t a l ! I N T E R O F F I C E M E M O R A N D U M
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Date: 19-February-82
From: TSG/NCSS
Loc: MR1-2/H22
Ext: HOTLINE 5911
Subj: Bell 212A Strapping Options
There are many customer choices for strapping options on the BELL
212A modem. Included here is a list of the factory-installed
strapping options which are the suggested options for connecting the
modems to RSX20F terminal lines.
THE STRAPPING OPTIONS ARE AS FOLLOWS
SWITCH PACK 1
TIP RING MAKE BUSY OUT S1 0
NOT USED OUT S2 0
CC INDICATION
FOR ANALOG LOOP ON S3 X
SWITCH PACK 2
SPEED CONTROL
HS BUTTON CLOSE S1 X
OPEN S9 0
INTERFACE CONTROL
MB/AL-ON LEAD OUT S2 X
TRANSMITTER
TIMING INT S3 0
S4 0
1200BPS OPERATION
ASYNC/start/stop OPEN S5 0
CHAR LENGTH(10 bit)
USE WITH start/stop CLOSED S6 X
RCVR RESPONDS
TO DIGITAL LOOP IN S7 0
INTERFACE CONTROL
RDL LEAD OUT S8 0
Page 2
Subj: Bell 212A Strapping Options
SWITCH PACK 3
LOSS OF CARRIER
DISCONNECT IN S1 X
RCV SPACE
DISCONNECT IN S2 X
CB AND CF
INDICATIONS COM S3 X
SEND SPACE
DISCONNECT IN S4 X
AUTOMATIC
ANSWER IN S5 0
ANSWER MODE
INDICATION OFF S6 0
SPEED MODE DUAL S7 0
INTERFACE SPEED
INDICATION OUT S8 0
SWITCH PACK 5
1200BPS
OPERATION
ASYNC/start/stop OPEN S1 0
OPEN S2 0
The 0 or X following the switch name is the BELL convention used to
describe whether the switch is open or closed. A 0 is switch open
and an X is switch closed.
Many of the switches may be in either position with no effect on the
operation of the modem with RSX20F.
The telephone company is responsible for changing the switches on
the logic module inside the modem. However the following is a
representation of how the switch packs (toggle type) should look
when set up as described above. Looking at the switch pack so that
the numbers of the switches are right side up each switch may take
two positions. In each position of a switch a bar is visible and
will appear at the top or bottom of the switch depending on the
position of the switch. The bar is represented by a ~
in the illustration. The ~ will either be above the switch ~
S
Page 3
Subj: Bell 212A Strapping Options
or below the switch S
~ to show how the switch is to be toggled.
|-----------|
| ~ |
| S S S |
| ~ ~ |
| 1 2 3 |
|-----------|
SWITCH 1
|----------------------------|
| ~ ~ ~ |
| S S S S S S S S S |
| ~ ~ ~ ~ ~ ~ |
| 1 2 3 4 5 6 7 8 9 |
|----------------------------|
SWITCH 2
|----------------------------|
| ~ ~ ~ ~ |
| S S S S S S S S S |
| ~ ~ ~ ~ ~ |
| 1 2 3 4 5 6 7 8 9 |
|----------------------------|
SWITCH 3
|--------|
| |
| S S |
| ~ ~ |
| 1 2 |
|--------|
SWITCH 5