CX81801 查看數據表（PDF） - Conexant Systems

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CX81801

V.92/V.34/V.32bis Modem in 128-Pin TQFP with CX20493 SmartDAA® and Optional CX20442 Voice Codec

Conexant Systems 

2.15

2.15.1

2.15.2

CX81801-7x/8x SmartV.XX Modem Data Sheet

• Blacklist parameters. The modem can operate in accordance with requirements of

individual countries to prevent misuse of the network by limiting repeated calls to

the same number when previous call attempts have failed. Call failure can be

detected for reasons such as no dial tone, number busy, no answer, no ringback

detected, voice (rather than modem) detected, and key abort (dial attempt aborted by

user). Actions resulting from such failures can include specification of minimum

inter-call delay, extended delay between calls, and maximum numbers of retries

before the number is permanently forbidden ("blacklisted").

These country profiles may be altered or customized by modifying the country-dependent

parameters. Additional profiles may also be included. There are two ways to add or

modify profiles:

• Incorporating additional or modified profiles into external flash ROM containing the

entire modem firmware code.

• Linking additional or modified profiles from an external serial EEPROM (needed

only if the external flash ROM capacity is exceeded.

Please contact an FAE at the local Conexant sales office if a country code customization

is required.

Diagnostics

Commanded Tests

Diagnostics are performed in response to test commands.

Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem,

which loops the data back to the local DTE.

DTMF Generation (%TT0 Command). Continuous DTMF tones are generated by the

DSP and output through the DAA.

Tone Generation (%TT3 Command). Continuous tones are generated by the DSP and

output through the DAA.

Power On Reset Tests

Upon power on, the modem performs tests of the modem and internal RAM. If the

modem or internal RAM test fails, the TMIND# output is pulsed as follows (Figure 2-1):

• Internal RAM test fails: One pulse cycle (pulse cycle = 0.5 sec. on, 0.5 sec. off)

every 1.5 seconds.

• Modem device test fails: Three pulse cycles every 1.5 seconds.

102199B

Conexant

2-11

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