SI2457-D-FS Silicon Laboratories Inc, SI2457-D-FS Datasheet - Page 191

• Manufacturer Part Number: SI2457-D-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-D-FS

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

ATH or
DTR off (&D2)
AT&F
ATZ or
DTR off (&D3)
Key Abort
DCE Initiated
disconnects
+FCLASS = 8
+FCLASS = 0,1
Notes:
+VLS Mode
Command or
Detector for
* 2Tones =
grammed
1. “HK”: Hook
2. “Keep HK”: Maintain ON or OFF hook status.
3. *If no +VNH=x command executed since last +FCLASS change.
tones.
2 pro-
Event
Input
21
Primitive
Table 118. +FCLASS and IDLE State Transitions Expected Response
ON-HK
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
ON-HK
+FCLASS = 8
Go to IDLE
Keep HK
Go to IDLE
Keep HK
S
+VNH = 0
Table 117. Voice Mode Operations (+FCLASS=8) (Continued)
On-Hook
DAA
+FCLASS=0,1
ON-HK,
+VNH = 0
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
OFF-HK
OFF-HK
+FCLASS = 8
Go to IDLE
Keep HK
+VNH = 0*
Go to IDLE
Keep HK
+VNH = 1
FDV DTMF
Ring, CID1
Detectors
2Tones*
Active
OFF-HK,
+VNH = 0
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
OFF-HK
OFF-HK
+FCLASS = 8
Go to IDLE
Keep HK
+VNH = 0*
Go to IDLE
Keep HK
Await call with tone genera-
tor connections to AOUT for
control beeps, ring tone, etc.
+VNH = 2
Current Modem Settings
Rev. 1.3
Description
ON-HK,
+FCLASS = 0
+VLS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
ON-HK
+VLS = 0
ON-HK
+FCLASS = 0,1
Go to IDLE
Keep HK
+VNH = 0
+VTX
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
ON-HK
+VLS = 0
OFF-HK
+FCLASS = 0,1
Go to IDLE
Keep HK
+VNH = 0*
+FCLASS=8
+VNH = 1
+VRX
+VSP
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
ON-HK
+VLS = 0
OFF-HK
+FCLASS = 0,1
Go to IDLE
Keep HK
+VNH = 0*
+VNH = 2
AN93
RS232-
>AOUT
+VTS
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