Specifications

AN93
Rev. 0.9 135
Table 91. Test Coverage
Circuit or Function &T2 &T3 Functional Test
Si2493/57/34/15/04 chip Yes Yes Yes
ISOcap™ Operation Yes Yes Yes
Si3018/10 Operation Yes Yes
Hookswitch Yes Yes
dc Termination Yes Yes
Bridge Yes Yes
AC Termination Yes Yes
Line Voltage Monitor Yes
Ringer Network Yes
Intrusion Detection Yes
Caller ID Yes
Overcurrent Detection Yes
Table 92. AT Commands for Compliance Testing
AT Command/Test Method Desired Response
ATH1 Continuous off-hook
ATH0 Return on-hook
AT&Hn (see command description for n) Set modulation
AT&T3 (requires load and loop current) Turn on carrier (originate)
Set S10 = 255 to keep the modem under test from hanging up after the
remote modem is unplugged. Connect with another modem (Si24xx in
answer mode); then, unplug the other modem.
Turn on carrier (answer)
AT&T4 Initiate transmit as originating modem
with automatic data generation
AT&T5 Initiate transmit as answering modem
with automatic data generation
ATX0 Blind dial (no dial tone)
AT*Y1D<digit> (example: AT*Y1D1 for DTMF1) Send continuous DTMF digit
ATM2 Speaker on continuously
ATM0 Turn off speaker
AT:Uhh,xxxx (hh is U-Register and xxxx is the hex value to be written) Write a U-Register
AT:Rhh (hh is U-Register) Read a U-Register
AT:R Read all U-Registers
ATA Send Answer Tone for 3 seconds
AT:U4D,0008 ATX0 ATDT Send Calling Tone
Connect test modem and remote modem through a telephone line sim-
ulator. Configure test modem without protocol. Set test modem
S10 = 255. Connect phone in parallel to remote modem. Set remote
modem to desired modulation. Dial remote modem and connect. Take
parallel phone off-hook. Remove power from remote modem. Test
modem transmits indefinitely.
Transmit a specific modulation