Equinox Systems MEGAPORT Hardware Reference Manual page 9

All of these boards differ only in the bus interface, the number of
ports provided on each and in the methods used to connect the
boards to terminals, printers and modems.
CS
MEGAPORT models with CS in their name provide the tradi-
tional RS-232 interface, including two modem control signals,
which may be used for either DTR/DCD modem supervision or
RTS/CTS hardware flow control. The MEGAPORT 12CS and
24CS models come with a cable terminating in a 50-pin telco
connector which can be attached to a variety of splitters and
distribution panels for device connection. The MEGAPORT
8CS provides this interface at 8 modular jacks located directly
on the board's mounting bracket.
FM
MEGAPORT models designated FM provide RS-232 interface
signals with full modem control and may be used for modem,
terminal and/or printer hardware flow control. The
MEGAPORT 12FM models come with a 12-port RJ-45 (ten pin
connector jacks) splitter for device connection and a 100-
conductor cable for connecting the board to the splitter.
LD
MEGAPORT models with LD in their name include a custom
interface which is compatible with RS-232, RS-422 and RS-423
devices. These boards are designed for applications requiring
long cable runs, beyond the limits of the standard RS-232
interface and operate with standard RS-232 devices at 38.4
Kbps to distances of up to 1000 feet.
This distance may be further extended to 3000 feet using an
Equinox LDA-232 line driver at the terminal end. LD boards
do not provide modem control signals and are designed for use
with terminals, printers and other non-modem devices.
Introduction 3