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Data modules and asynchronous data units
555-233-116
52 Issue 4 October 2002
5. Use the DCE position to connect to DTE equipment. Use the DTE position
to connect to DCE equipment. To change the mode, remove the board by
grasping it and pulling it gently upward. Flip the board around, left to right,
and reinsert it in the socket so that the correct operating mode, DCE or
DTE, appears in the upper lefthand corner.
6. Snap the top cover onto the unit.
Setting 7400B data module hardware options
You configure the 7400B data module using DIP switches on the circuit card
inside the case. Figure 12 shows the front and rear of a 7400B data module.
To configure the 7400B data module, proceed as follows.
!
WARNING:
Electrostatic discharge can severely damage sensitive electronic circuits.
Before handling any electronic hardware, be sure to wear a grounding wrist
strap or other static-dissipating device. Do not touch exposed circuitry or
semiconductor chips.
1. If you are not attaching a telephone to the data module, activating data
metering, or enabling busyout on the local loop, you can use the factory
default settings. The 7400B data module is already configured for your use.
Stop now.
POWER
TEST
DATA
METERING
7400B Data Module
AA CD RD SD TR OH
CHECK
SPEED
DATA
PORT 2
PORT 1
POWER
PHONE
LINE
74
00
bRBP
03
2
596
Figure 12. 7400B data module