
88
Serial Parallel Controller User’s Guide—March 1992
D
Data Terminal Equipment (DTE) typically includes terminals, personal
computers, and workstations. Modems are a good example of Data
Communications Equipment (DCE).
A modem cable connects a modem to your patch panel. Since DTE and DCE
devices send and receive through different pins, their signals will not collide.
The following figure shows the wiring of a serial modem cable that enables the
Serial Parallel Controller card to communicate with a Hayes-compatible
modem. If you obtain a serial cable wired like the one shown, it will properly
connect your patch panel and a Hayes-compatible modem. For the signal
names of the pins, see “Patch Panel Pinouts” in Chapter 3.
Figure D-1
DTE to DCE
DB-25
connector
DB-25
connector
2
3
4
5
6
7
8
20
2
3
4
5
6
7
8
20
1
1
Modem cable
DTE
DCE
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