Jumper S10 − Carrier Detect Delay; Jumper S11 − Turnaround Squelch Time; Jumper S12 − Soft Carrier Turn Off; Jumper S13 − Anti-Streaming - Black Box MD1970A User Manual

Installing the Modem
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Jumper S10 Carrier Detect Delay
Jumper S10 configures the modem's Carrier Detect turn on Delay timing. The delay chosen must be consistent with
the Clear To Send delay selection of the transmitting modem and must be less than the CTS delay. The available
delays are 6 ms (default) and 23 ms. The carrier detect drop out is less than 6 ms.
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Jumper S11 Turnaround Squelch Time
Jumper S11 is used with the call turnaround squelch option (jumper S4). The available times are 8 ms (default) and
159 ms.
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Jumper S12 Soft Carrier Turn Off
Jumper S12 configures the modem to either turn off the transmitter immediately upon release of Request To Send,
or send a Soft Carrier Turn Off signal of 900 Hz for 8 or 26 ms at the end of each transmission.
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Jumper S13 Anti-Streaming
Jumper S13 lets you select an anti-streaming time or use no anti-streaming at all. Anti-streaming is typically used in
multi-point applications to prevent a malfunctioning slave from occupying the line indefinitely.
When anti-streaming is active, the modem can only transmit data for up to 56 seconds. Thereafter, the modem's
transmitter is automatically turned off. The modem then looks for an ON-to-OFF transition of Request To Send
(RTS) before proceeding with normal operation.
6 ms (default)
Settings:
23 ms
Settings: 8 ms (default)
159 ms
Settings: None
8 ms (default)
26 ms
Settings: None (default)
4 seconds
7.6 seconds
14 seconds
28 seconds
56 seconds
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