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Configuring the Unit
5-173550-A2-GB20-10 February 1995
Table 5-8
(1 of 4)
General Configuration Options
DTE Port: EIA232
Next EIA232 V.35 Prev
DTE Port
(not displayed when a TDM/Flex is installed and enabled). Selects the active DTE interface.
EIA232 — Select when using the EIA-232 interface (connector). EIA232 operation is recommended for speeds
19.2 kbps or below. Operation at speeds up to 56 kbps is dependent upon cable length, cable quality, and
the local environment.
V.35 — Select when using the V.35 interface (connector). Operation at available rates for distances up to 1000
feet.
RTS Cntrl: DTE for MPTT; FrcOn for other configurations
Next FrcOn DTE Prev
Request-to-Send Control
. This configuration option determines how the DSU will function with respect to the RTS lead. If
set to FrcOn, the DSU internally forces the RTS lead ON; if set to DTE, the DSU sends control mode idle (CMI)
whenever RTS is Off, and data mode idle (DMI) when RTS is ON.
FrcOn — Select for PTPC, PTPT, and MPTC configurations. With this setting, the DSU internally forces data mode
idle (DMI), regardless of whether RTS at the DTE interface is ON or Off.
DTE — Select for MPTT configuration. This setting causes the DSU to send a control mode idle (CMI) signal
whenever RTS is Off, and a data mode idle (DMI) signal when RTS is ON.
CTS Cntrl: Std
Next Std =RTS Delay FrcOn Prev
Clear-to-Send Control
. Controls the behavior of the CTS lead when abnormal conditions are present (e.g., No Signal or
Test Mode), as determined by the configuration options RTS Cntrl and Circ Assur.
Std — Select for all factory-loaded configurations (PTPC, PTPT, MPTC, and MPTT) so that the DSU responds to
abnormal conditions. When selected, CTS follows RTS except when the DSU is in Test Mode, or an
alarm or CMI is being received, and
Circ Assur
is set to Enab.
=RTS — When selected, CTS follows RTS regardless of whether Test Mode, an alarm, or CMI is being received.
Delay — Select when using automatic backup. Selecting Delay is the same as selecting Std except that when an
alarm is received, CTS does not go low (drop) until the DBM or
external
DBU has failed to backup in the
time allotted by the
Tries Time-Out
(in the Backup options set) setting. Make sure that
Auto Backup
(in
the Backup option set) is enabled.
FrcOn — When Forced On is selected, CTS remains ON as long as the DSU is receiving power.
AntiStream:Disab
Next Chang Prev
Antistreaming
(only displayed when Full Mode is enabled, and a TDM/Flex is not installed). Antistreaming provides
circuit protection against a streaming DTE (a defective DTE that has its RTS lead constantly turned ON) by clamping the
RTS lead of the tributary DSU.
Antistreaming only takes effect when
RTS Cntrl
is set to DTE; it is disabled when
RTS Cntrl
is set to FrcOn.
Chang — Set timer to any value from 1 to 100 second(s), in increments of 1; or to Disab when streaming terminal
detection is not needed.