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10.5.0 MODEM CABLING TO COMMON
CARRIER
Leased Line or Leased Line and Switched Network Backup Connector
COMTB2 (2400 bps modem only)
10 Position Terminal Block on
the Cable Entry Tower
White
- 1
--+-------
-2-
e 3-
e4_
Red
_ 5 __
-1--------
Black
e
6 __
-1--------
- 7-
- 8e
- 9_
Yellow
-10--+---------
Leased
Line
.. White
r '
rl
I I
I
I
I I
LJ
I I
LJ
Transmit
System/32 (Back View)
s€i
Red
\
Or
Yellow
.
(see note)
\ Receive (not used
Black
. h 2
.
.
)
Wit
-wire connection
WT Countries - Remove 283-B Plug
U.S.A. and Canada - Red and Green (white) - Transmit
Black and Yellow - Receive
283-B Plug
COMTB1 (2400 bps modem only)
5 Position Terminal Block on
the Cable Entry Tower
White
- 1 --+-------
-2-
- 3 -
Yellow and Black are Not Used
Red
Switched Network Backup
(without automatic answering)
White
Transmit {Red
~
Or
Not Used {YellOW
(see note)
Black
.2)
Red
Green
(white wire)
283-B Plug
Note: There is only one cable to the common carrier from each terminal block. The
283-B plug is used in the U.S.A. and Canada; it is removed for WT countries.
Data Communications
10-39
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