SI2493-C-GT Silicon Laboratories Inc, SI2493-C-GT Datasheet - Page 200

• Manufacturer Part Number: SI2493-C-GT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-GT

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
This looks the same as the V.22 bis protocol above except for S1 signal used for signaling V.22 bis(ness) and for
start of retrains.
200
2100 Hz Answer Tone.
DTMF dialing.
2100 Hz Answer Tone.
Unscrambled Binary
Ones (USB1) signal.
Two tones at 2250
and 2850 Hz.
The three short horizontal
lines are the S1 signal
that triggers V.22bis train-
ing. The S1 signal is an
unscrambled double
digit 00 – 01.
Figure 67. Appearance of V.22 Fast Connect Protocols
Figure 66. Appearance of V.22 bis Protocol
Rev. 0.9
Caller Responds with
SB1s and scrambled
data.
Answering modem’s
scrambled binary
ones and scrambled
data; visually indis-
tinguishable from
each other.
Calling modem’s
Scrambled Binary
Ones and Scram-
bled Data; visually
indistinguishable
from each other.
Caller sends SB1s
immediately.