XE0068DT View Datasheet(PDF) - Xecom
Part Name
Description
Manufacturer
XE0068DT Datasheet PDF : 14 Pages
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XE0068DT Operational Modes
Burst Mode
Burst mode is used to transmit DTMF signals of specific duration. The XE0068DT transmitter
sends symmetric tone bursts which are on for 51 milliseconds and off for 51 milliseconds. This
is a standard interval for central office switching. When call progress mode is also selected ex-
tended bursts of 102 milliseconds can be sent.
Single Tone Generation The XE0068DT may be used to generate single tones as well as tone pairs. Control
Register B regulates single tone transmission.
Call Progress Mode Call Progress Mode allows detection of the various tones used to identify the status of a call.
They include Ring Back, Busy Tone Dial Tone, etc. In call Progress Mode the XE0068DT
provides a square wave representation of these signals on the CP pin. The system host can de-
code the incoming call progress tones.
Initialization Procedure
Description
Read Status Register
Control Lines
RS0 WR RD
1
1
0
Write to Control Register
1
0
1
Write to Control Register
1
0
1
Write to Control Register
1
0
1
Write to Control Register
1
0
1
Write to Control Register
1
0
1
Read Status Register
1
1
0
* Performs a software reset on the XE0068DT
Data Bits
D3 D2 D1 D0
X
X
X
X
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
X
X
X
X
Call Progress Tone Definitions
The chart below shows the signal characteristics for the most common call progress tones in the United States.
Check the frequency and cadence on the CP line to identify signals in Call Progress mode.
Tone Frequency (Hz) Cadence
Level Description
Dial Tone
Ringback
350 + 400
440 + 480
Steady
2 sec. On
4 sec. Off
-13 dBm
-19 dBm
Indicates the network is ready to receive dialing
signals
Indicates the called line is ringing
Busy Tone 480 + 620
.5 sec. On
.5 sec Off
-24 dBm Indicates the called line has been reached but is
currently in use.
Reorder
480 + 620 .25 sec. On
.25 sec Off
-24 dBm Indicates the switching path is busy
Partial Dial Tone 480
Steady
-17 dBm
Notifies the calling party that dialing has not begun
in the allotted time or that not enough digits have
been dialed.
XECOM
(7)
XE0068DT
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