Telephone Line Emulator User’s Manual
40-400-00020, Rev. M 88
OSI Duration
The OSI is a form of DC signaling, sent during an on-hook state, prior to Visual Message
Waiting. During this time, the -48 VDC is momentarily removed. OSI may be set from 0
seconds to 5 seconds in 5 mS increments.
CAS Duration
CAS Tone is a CPE Alerting Signal; a Bellcore term for a tone used to alert CPE
equipment of Call Waiting, asking for ACKnowledgement prior to sending Caller ID. The
CAS Duration may be set from 70 mS to 90 mS in 5 mS increments.
Wait for Acknowledge
After the TLE sends the CAS signal it waits a certain time for a DTMF Acknowledgement
signal from the CPE device. It sees this, it sends the FSK data. This Wait for
Acknowledgement time may be varied to ensure that CPE devices are responding within
the proper time window. Wait for Acknowledgement may be set from 100 mS to 300 mS
in 5 mS increments.
Dual Tone Duration (DT-AS)
The length of the Dual Tone Duration is programmable from 85 mS to 115 mS in 5 mS
increments.
Minimum Ring Off Time
By default, the TLE must see a minimum of 3 seconds in the off portion of the Ring
Cadence, before Caller ID is sent. By programming this field to a shorter time, the user
can force a transmission during shorter Ring Off Time. The user must be aware that for
shorter times, the entire FSK data burst may not be complete before the next ring cycle.
The Minimum Ring Off Time can be set from 0 seconds to 10 seconds. This feature only
applies to the “Pause in Ring Cycle” Alerting Sequence.
Call Waiting Timing
Two Cadences are available: Normal and Distinctive.
The Leading Blank time is the time from when the existing call is muted and the Call
Waiting starts. The Trailing Blank time is the time from when the Call Waiting stops and
the existing call is reconnected.
Leading Blank, or the delay before the call waiting tone is sent, may be set from 5 to 100
mS off in 5 mS increments.
Trailing Blank, or the delay after the Call Waiting tone is sent, may be set from 20 to 100
mS off in 5 mS increments.
Cadence
On and Off times may be set from 0 mS to 1500 mS in 5 mS increments. The delay
between tone bursts may be set from 1.000 S to 20.000 S in 5 mS increments.
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