Getting Started with MAXserver Access Servers
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To use modem control or hardware flow control, you need an input control
signal and an output control signal for each. This is important to consider
when you decide which NBase-Xyplex unit to use for a particular
application, since different NBase-Xyplex units support different wiring
schemes, and some units might not have enough signals for the desired
application.
NBase-Xyplex cabling and software can be configured to use various
combinations of modem control, and hardware flow control. There are two
types of hardware flow control: DCD/DSR and RTS/CTS. DCD/DSR flow
control (referred to here as "standard" hardware flow control) is the type
that one would typically use with lower speed modems. RTS/CTS is used
with high speed modems (typically, these modems support CCITT V.42
operation). Only one type of hardware flow control can be used at a given
port. Modem control and DCD/DSR hardware flow control are mutually
exclusive (i.e., only one of these can be enabled at a given port). On 8-wire
interfaces, modem control can be used concurrently with RTS/CTS hardware
flow control.
NOTE:
You would use a "null-modem" cable when making a direct
connection between the serial ports of two access servers
(i.e., no modems involved) or other DTE device. For that
application, use a DTE-to-DTE cable, as described in the
hardware documentation supplied with your unit.
Making Your Own RJ-45 Cables
If you make your own cables, you should be very careful when using the
crimping tool. Make sure that the RJ-45 connector is fully inserted into the
die-set cavity of the crimping tool, and that the wire is fully inserted into the
RJ-45 connector, before crimping. The die set might be fragile, and could
break if the RJ-45 connector is not properly seated before you squeeze the
handle.
