Black Box MT160A Manual page 31

MicroCSU/DSU Cards and MicroRacks
Set this option as follows:
• Internal (Master): To use the Card internal reference clock as the timing
source, select item 1. Use internal timing in point-to-point applications where
the Card is being used as a limited distance modem. (Set the far-end Card for
looped timing as described below.)
• Network (Looped): To have the Card 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.
• External (Terminal Timing): To have the Card use the DTE-supplied transmit
clock (pin 24 on an 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 Cards are interconnected.
• Switched 56: When using a Card 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.
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 Card holds RTS off until the terminal drops RTS. The timer
interval decreases as the line rate increases.
ANTI-STREAM TIMER MENU—Esc to exit
1. Enable Anti-Stream Timer
2. Disable Anti-Stream Timer (DEFAULT)
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Figure 16. Anti-Stream Timer Menu.