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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