NEC DS1000, Product Description

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Section 3: Features
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Section 3: Features DS1000/2000 Product Description
Following is a summary of Analog Station Timers.
Table 7: Analog Station Timers
Option Description
Loop Current Use this option to set the maximum allowed loop current for the
system’s ASTU PCBs. Normally choose 25mA for short loops
and 35mA for long loops. In general, a long loop is 3000 feet or
longer and a short loop is less than 3000 feet.
Minimum Break Time
This timer defines the minimum amount of time the loop must
be opened to properly decode the dial pulse digits sent from ana-
log devices connected to ASTU PCBs.
Maximum Break Time
This timer defines the maximum amount of time the loop must
be opened to properly decode the dial pulse digits sent from ana-
log devices connected to ASTU PCBs.
Minimum Make Time
This timer defines the minimum amount of time the loop must
be closed to properly decode the dial pulse digits sent from ana-
log devices connected to ASTU PCBs.
Maximum Make Time
This timer defines the maximum amount of time the loop must
be closed to properly decode the dial pulse digits sent from ana-
log devices connected to ASTU PCBs.
Minimum Hookflash Time
For ASTU PCBs, this timer defines the minimum amount of
time the loop must be opened before the system starts to detect a
transfer or hang up sequence. Open loop intervals shorter than
the setting are ignored by the ASTU PCB.
Maximum Hookflash
Time
For ASTU PCBs, this timer defines the maximum amount of
time the loop can be opened in order for the system to detect a
Transfer sequence. Open loop intervals longer than the setting
are interpreted as hang up.
Minimum Off-Hook Time
For ASTU PCBs, this timer defines how long a connected analog
device must remain off-hook before the system recognizes the
off-hook status.
Off-Hook Guard Time
The ASTU PCB waits this interval after an analog device hangs up
before accepting any additional input from the device. This timer
helps prevent erroneous detection due to hardware stabilization.
Dial Pulse Guard Timer
The ASTU PCB waits this interval between dial pulse digits
before attempting to detect any additional DP digits. This timer
helps prevent erroneous DP dialing due to hardware stabilization.
Loop Disconnect Time
When the far end disconnects, the ASTU PCB opens the loop to
the connected analog device for this interval.
Ring/MW Wait Period
Time
This timer determines the ringing sequence for the devices con-
nected to ASTU PCBs.