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Information about Model 3395A Server Cabling Methods
893-826-A
Information about Model 3395A Server Cabling Methods
Model 3395A servers can be connected to a variety of modems or other devices
through one of two wiring schemes (with 6 or 8 wires), which support different
modem control and hardware flow control options.
that offer 6- or 8-wire serial interfaces.
Table 2-1.
Cabling support for modem applications
Cabling
Products
6-wire
Model 3395A Terminal Server
(Bay Networks part number 950-070-A or 950-070-B)
8-wire
Model 3395A Terminal Server
(Bay Network part number 950-070-C or later)
To use modem control or hardware flow control, you need an input control
signal and an output control signal for each.
Model 3395A server 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 (which typically 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.
combinations that can be used.
Table 2-2.
Modem control/flow control feature support
Feature
Modem Control
DCD/DSR Hardware Flow Control
RTS/CTS Flow Control
Concurrent Modem Control and RTS/CTS Flow
Control
* Uses DTR and DCD leads wired to RTS and CTS pins
NOTE: You would use a "null-modem" cable when making a direct connection
between the serial ports of two Model 3395A 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.
Table 2-1
lists the products
Table 2-2
shows the
6-Wire
8-Wire
Yes
Yes
Yes
Yes
Yes *
Yes
No
Yes
2-3
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