Table of Contents
Advertisement
Set this option as follows:
• Internal (Master): To use the Model 2500RC and 2520RC internal
reference clock as the timing source, select item 1. Use internal timing
in point-to-point applications where the Model 2500RC Series is being
used as a limited distance modem. (Set the far-end Model 2500RC
Series unit for looped timing as described below.)
• Network (Looped): To have the Model 2500RC Series derive a
transmit clock from the incoming data stream from the network, select
item 2. This is the default setting and appropriate for most applications.
(Models 2500RC and 2520RC only)
• External (Terminal Timing): To have the Model 2500RC Series use
the DTE-supplied transmit clock (pin 24 on and RS-232/V.24 interface
or pins U and W on a V.35 interface), select item 3. Use external timing
for tail-circuit applications, in which the RS-232 or V.35 ports of two
Model 2500RC Series units are interconnected.
• Switched 56 (Model 2510RC and 2520RC only): When using a
Model 2510RC or 2520RC with Switched 56 service, select item 4.
Anti-Streaming Timer
Choosing option "a" (options "a" through "e" must be entered in
lower-case letters) in the Software Switch Menu takes you to the Anti
Stream Timer Menu (below). This option lets you enable or disable the
anti-streaming timer, which protects multidrop networks from a drop that
is continuously transmitting. If the DTE asserts RTS for a period of time
exceeding the timer interface, the timer forces RTS off internally. This
allows the rest of the multidrop network to resume operation. The
Model 2500RC Series holds RTS off until the terminal drops RTS. The
timer interval decreases as the line rate increases.
21
Advertisement
Table of Contents
