SI3015-FS Silicon Laboratories Inc, SI3015-FS Datasheet - Page 37

• Manufacturer Part Number: SI3015-FS
• Description: SI2400 ISOMODEM LINE-SIDE
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3015-FS

• Data Format: V.90
• Interface: Serial
• Voltage - Supply: 3.3 V ~ 5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Baud Rates: -

Modem Result Codes and Call Progress
Table 21 shows the modem result codes which can be
used in call progress monitoring. All result codes are a
single character to speed up communication and ease
host processing.
Automatic Call Progress Detection
The Si2400 has the ability to detect dial, busy and
ringback tones automatically. The following is a
Command
m
H
N
O
R
K
a
b
c
d
k
L
n
v
x
^
I
r
f
i
l
t
,
Table 21. Modem Result Codes
Function
British Telecom Caller ID Idle Tone
Alert Detected
Busy Tone Detected
Connect
Connect 1200 bps (when pro-
grammed as V.22bis modem)
Hookswitch Flash or Battery Reversal
Detected
Modem Automatically Hanging Up in
Japan Caller ID Mode
Intrusion Completed (parallel phone
back on hook)
Intrusion Detected (parallel phone off-
hook on the line)
Kissoff Tone Detected
Contact ID Kissoff Tone too long.
Phone Line Detected
No Phone Line Detected
Caller ID Mark Signal Detected
No Carrier Detected
No Dial tone (time-out set by CW
[S02])
Modem OK Response
Incoming Ring Signal Detected
Ringback Tone Detected
Dial Tone
Connect 75 bps TX (V.23 originate
only)
Overcurrent State Detected After an
Off-Hook Event
Kissoff tone detection required
Dialing Complete
Rev. 1.1
description
implemented for these three tones.
1. Dial Tone. The dial tone detector looks for a dial tone after
2. Busy / Ringback Tone. After dialing has completed, the
Manual Call Progress Detection
Because other call progress tones beyond those
described above may exist, the Si2400 supports manual
call progress. This requires the host to read and write
the low-level DSP registers and may require realtime
control by the host. Manual call progress may be
required for detection of application-specific ringback,
dial tone, and busy signals. The section on DSP low
level control should be read before attempting manual
call progress detection.
To use this mode, the automatic modem responses
should be disabled by setting S14[7] (MRCD) = 1b. The
call progress biquad filters can be programmed to have
a custom frequency response and detection level (as
described in “Low Level DSP Control”).
Four dedicated user-defined frequency detectors can
be programmed to search for individual tones. The four
detectors have center frequencies which can be set by
Register
going off hook and before dialing is initiated. This can be
bypassed by enabling blind dialing (set S07[6] (BD) =1b).
After going off hook, the Si2400 waits the number of
seconds in S01 (DW) before searching for the dial tone.
In order for a dial tone to be detected, it must be present
for the length of time programmed in S1C (DTT). Once the
dial tone is detected, dialing will commence. If a dial tone
is not detected within the time programmed in S02 (CW),
the Si2400 will hangup and echo an “N” to the user.
Si2400 monitors for Busy/Ringback and modem answer
tones. The busy and ringback tone detectors both use the
call progress energy detector. The registers that set the
cadence for busy and ringback are listed in Table 22.
Si2400 register settings for global cadences for busy and
ringback tones are listed in Table 23.
S1A
S1B
S16
S17
S18
S19
Table 22. Busy and Ringback Cadence
of
BTON
RTON
RTOD
Name
BTOF
BTOD
RTOF
the
Registers
algorithms
Busy tone delta time 10 msec
Ringback tone delta
Busy tone on time
Busy tone off time
Ringback tone on
Ringback tone off
Function
time
time
time
that
Si2400
have
10 msec
10 msec
53.333
53.333
53.333
Units
msec
msec
msec
been
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