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Chapter 2. Installation
61200062L1-1 DSU 56/64 User Manual 2-3
Antistream - SW 3
The Antistream option is used to select the antistream time out. The
antistream time out is the maximum time the DSU 56/64 is allowed
to transmit data from the DTE into the network. This feature
prevents one DTE device on a multi-drop network from
continuously tying up the transmit circuit from a remote DSU back
to the master DSU.
The antistream timer is reset to zero when RS transitions to the
active state and is updated every second while RS is active. When
the antistream time out expires, the DSU 56/64 stops transmitting
DTE data into the network. It does, however, continue to accept
data. CS is maintained in the active state until the DTE deactivates
the RS input.
Down - Off
The Antistream timer is disabled.
Up - On
The Antistream timer is enabled and set for 45 +/- 0.5 seconds.
Carrier Detect (CD) - SE 4
Down - Normal
CD is on any time customer data is being received and off when the
receive circuit is idle, not carrying customer data.
Up - On
CD is forced on all the time.
Data Set Ready (SR) - SW 5
Down - On
SR is forced on all the time.
Up - Normal
SR is only turned off when the network is out of service or a test is
in progress.