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COMSPHERE 3550 Series Data Service Units
5-26 February 1995 3550-A2-GB20-10
Table 5-11
(4 of 4)
MUX (Port) Configuration Options*
Elast Stor: Disab
Next Enab Disab Prev
Elastic Store
(only displayed when Full Mode is enabled). Elastic Store hardware consists of a transmit buffer (register).
Serial data from the extended circuit is clocked into the DSU elastic store using a clock provided by the extended circuit
received clock lead. The DSU uses its own system timing to clock data out of the buffer.
Elastic Store is reset on power-up, overflow, or after the RTS lead makes an Off-to-ON transition. After reset, the elastic
store can drift by ±5 bits with the TDM/Flex enabled before overflow occurs.
Enab — Select to enable this configuration option.
Disab — Select to disable this configuration option.
RTS/CTS Del: 0
Next Chang Prev
Request-To-Send to Clear-To-Send Delay
(only displayed when Full Mode is enabled). Allows for an additional delay
between the time that RTS is turned ON and CTS is turned ON. An additional delay is sometimes required for
multiplexed applications operating in switched-carrier operation.
Enough delay must be provided so that the last DSU in
the circuit has time to train and is ready to accept data before CTS is turned ON.
Chang — Select to change the RTS-to-CTS delay, from 0 to 1040 milliseconds in 8 milliseconds increments.
DTR Alarm: Disab
Next Enab Disab Prev
Data Terminal Ready Alarm
(only displayed when Full Mode is enabled). Causes the DSU to report an alarm for the port
if the port’s DTR lead is Off for more than 30 seconds. The DCP displays DTR Alarm and reports the alarm to NMS.
Enab — Select if you want the DSU to report an alarm when the port’s DTR lead turns Off for 30 seconds.
Disab — Select if no alarm is to be reported, regardless how long the port’s DTR lead is Off.
AntiStream:Disab
Next Chang Prev
Antistreaming
(only displayed when Full Mode is enabled). 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.
DSR FrcOn: Enab
Next Enab Disab Prev
Data Set Ready Forced On
(only displayed when Full Mode is enabled). Provides the ability to override any other
options controlling the DSR lead.
Enab — Select for DSR to remain ON as long as the device is working, regardless of any tests or network alarms.
Disab — Select if DSR is to function as an active lead, reflecting various test and alarm conditions.
DSR on Tst: Enab
Next Enab Disab Prev
Data Set Ready On in Test
(only displayed when Full Mode is enabled). Controls the behavior of the DSR lead during
testing.
Enab — DSR is ON continuously during testing, allowing a DTE that relies on DSR being ON to send test
messages to the DSU.
Disab — DSR is Off during testing.
* The menu paths for Prt1 and Prt2 are identical.