Motorola V3229 Operating Instructions - Page 224

Test Procedures FALLBACK RATES Since there is no standard fallback procedure from V.32b rates to V.22 rates, problems may arise when a V.32 optioned for 14400 originates a call to a V.22 bis modem. If this is a problem, change the originate modem speed to 2400 bps from the front panel or with the AT command AT%B3. MODEM AND TELEPHONE LINE CHECK Step 1 -B ¥Configure the modem for LOCAL ANALOG LOOP WITH TEST PATTERN. This forces the modem on hook, terminates the local modem leased lines into 600 ohms, and connects the local modem transmit output amplifier back to its own receiver. Transmit input data from the terminal is inhibited and is substituted with a V.52 test pattern. ¥This test checks operation of the local modem modulator and demodulator circuitry and should be attempted at both local and remote sites if operators are available. ¥When errors are present, the TEST PATTERN ERRORS display counts errors. Note: The following LED illustrations show indications for diagnostic tests. These indications are valid when DTE options are set by factory option set #1 and RTS is active from the DTE. Where indicated V.3229 / V.3229L