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Data Communications
Each cable has at least three connectors (figure 7-8), one for connecting to the modem or
hardwired line (first multipoint cables, or the preceding terminal's cable (daisy chain cable),
another for connecting to the terminal, and a third for connecting to the next terminal in the
daisy chain.
The daisy chain cable has a fourth connector, the ((pass-through" connector, which is used to
preserve continuity in the daisy chain when a terminal is removed from the daisy chain. The
terminal is
tak~n
offline by disconnecting the daisy chain cable connector from the terminals
datacomm port and connecting it to the cable's pass-through connector.
Multipoint cables are listed in table 7-5.
Option 021 of both the HP 2625A and HP 2628A terminals comes equipped with a cable for
connecting between port 1 of the terminal and the data link adapter of a DSN data link line
(figure 7-9).
--------.~-
2625A, Opt. 021
or
2628A, Opt. 021
---~r------
Data Link
Connection
Box
Data Link
Adapter
Data Link
Connection
Box
NOTE:
1.
-I>
is a male connector.
2.
>
is a female connector.
Figure 7-9. DSN Data Link Configuration
7-21
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