50
CSU/DSU MS DBU
7.7 Anti-Stream
The Anti-Stream option is used to select the anti-stream timeout. The anti-stream
timeout is the maximum time the CSU/DSU MS DBU transmits data into the
network from the DTE. This feature prevents one DTE device on a multi-drop
network from continuously tying up the transmit circuit back to the master DSU.
The anti-stream timer is reset to zero when RS changes to the active state and is
updated every second while RS is active. When the anti-stream timeout expires,
the CSU/DSU MS DBU stops transmitting DTE data into the network but
continues to accept data from it. This condition exists until the DTE
deactivates the RS input.
The factory-default setting is Timer Off. Table 7-1 shows the available options
and their AT commands.
7.8 CD Options
The CD Options menu is used to select the control mode for the receive
line signal detector (CD) lead. The factory-default setting is Normal.
Table 7-1 shows the equivalent AT commands for setting CD options.
7.9 Data Terminal Ready (TR) Options
The TR Options menu is used to select the CSU/DSU MS DBU response
to the Data Terminal Ready (TR) lead. The factory-default setting is Ignored.
Table 7-1 shows the equivalent AT commands for setting TR options.
NOTE
The NO DBU IF OFF selection is available only when a DBU module
is installed and the Network Type is set to DEDICATED.
To disable DBU when DTR is off, set this option for IDLE WHEN OFF.
7.10 Data Set Ready (SR) Options
The SR Options menu is used to select the operating mode for the Data
Set Ready (SR) lead. Use Shift + A to activate the SR Options submenu;
press Enter to enter the SR Options submenu. The factory-default setting
is Off Test Only. Table 7-1 shows the AT commands for setting SR options.