HP 271308 Technical Reference Manual page 23

Eight -channel multiplexer
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HP 27130B
Extension Cable Fabrication
The 27130B l\1UX is shipped with an extension cable connector kit to help fabrication of an extension
cable between the MUX card and the eight-port, RS-232-C connection box.
Note
This extension cable should NOT be longer than 300 feet maximum.
The recommended bulk cable to use for an extension is available from the Hewlett-Packard Parts
Center in Mountain View, California under the HP part number: 8120-4510.
Note
Colored and twisted pairs of wires must be carefully identified in the cable. These pairs must be con-
nected to specific terminal pins on the connectors for correct cable fabrication. Refer to Figure 2 for
a list of which colored pairs of wires are connected to which connector pins.
Use the instruction sheets supplied with the connector kit and the T-tool kit to fabricate your exten-
sion cable.
Be careful to match the correct color wire pairs to the correct connector terminal pins on the second
connector. Repeat the steps on the sheets to connect the second end of the cable to the second
connector.
INST ALLA TION
I
CAUTION
I
AL WAYS
ENSURE
THA T
POWER
TO
THE
COMPUTER
IS
OFF
BEFORE
INSER TING
OR
REMOVING THE MUX CIRCUIT CARD AND CABLE.
FAILURE TO DO SO MAY RESULT IN DAMAGE TO
THE MUX.
CAUTION
SOME
OF THE COMPONENTS USED
ON THE
PRINTED CIRCUIT CARD ARE SUSCEPTIBLE TO
DAMAGE BY STATIC DISCHARGE. REFER TO THE
SAFETY CONSIDER A TIONS INFORMATION AT THE
FRONT OF THIS MANUAL BEFORE HANDLING
THE CARD.
Install the MUX as follows:
1. Determine if your computer system can supply the power needed for the MUX card. Refer to
Table 1-1 in Section hfor power requirements.
2. Verify that the Memory Configuration jumper is configured correctly for the EPROMs/RAMs
installed on the card. To verify that jumpers are configured correctly, determine what types of
2-11

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