SI2457-D-FT Silicon Laboratories Inc, SI2457-D-FT Datasheet - Page 67

• Manufacturer Part Number: SI2457-D-FT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-D-FT

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

A,B,C,D,E,F,G
+FCLASS = X
Command
+FRM = X
+ESA =
Table 39. Basic AT Command Set (Continued)
Synchronous access mode control options
A – Specifies action taken if an underrun condition occurs
during transparent sub-mode
+ESA[G]) on idle.
B – Specifies action taken if an underrun condition occurs
after a flag during framed sub-mode
C – Specifies action taken if an underrun or overrun condition
occurs after a non-flag during framed sub-mode
frame.
D – Specifies V.34 half duplex operation. This parameter should
not be used.
E – Specifies CRC polynomial used while in framed sub-mode
modem
F – Specifies NRZI encoding and decoding
G – Defines 8-bit SYN
Class 1 Mode Enable.
X
0
1
8
256
Class 1 Receive Carrier.
X
2
95
96
200
sage.
0 = Modem transmits 8-bit SYN sequences (see
0 = Modem transmits 8-bit HDLC flags on idle.
0 = Modem transmits abort on underrun in middle of
1 = Modem transmits flag on underrun in middle of frame
and notifies host of underrun or overrun.
0 = CRC generation checking disable
1 = 16-bit CRC generation and checking is performed by the
0 = NRZI encoding and decoding disabled
255 = Fixed at 255 (marks)
Mode
Off
Enables support for V.29 Fast Connect mode.
Enables voice mode.
SMS mode
Mode
Detect V.21 (980 Hz) tone for longer than 100 ms, then
V.29 short synchronous.
V.29 full synchronous.
Returns to data mode prepared to receive an SMS mes-
send answer tone
(2100/2225 Hz) for 200 ms.
Rev. 1.3
Action
AN93
67