Lenovo ThinkPad T420 (English) User Guide - Page 71
Table 3. Modem command list continued, &F
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Table 3. Modem command list (continued) &F Set to Factory Defined &F Configuration &T Local Analog Loopback &T[] Test I Request Identification I[] Information attempt a LAPM connection and then MNP connection. Failure to make a reliable connection results in the modem hanging up. 3: Selects auto reliable mode and forces &Q5 (the modem will try to negotiate an error corrected link). This operates the same as \N2 except failure to make a reliable connection results in the modem falling back to the speed buffered normal mode. 4: Select LAPM error-correction mode and forces &Q5 (the modem will try to negotiate an error corrected link). Failure to make an LAPM error-correction connection result in the modem hanging up. 5: Selects MNP error-correction mode and forces &Q5 (the modem will try to negotiate an error corrected link). Failure to make an MNP error-correction connection results in the modem hanging up. 0: Terminates test in progress. 1: Initiates local analog loopback, V54 Loop 3. If a connection exists when this command is issued, the modem hangs up. The CONNECT XXXX message is displayed up the start of the test. 0: Reports product code. 1: Reports the latest significant byte of the stored checksum in decimal. 2: Reports OK. 3: Reports identification codes. 4: Reports product description from the .INF file. 5: Reports Country Code parameter. 6: Reports modem data pump model and internal code revision. Chapter 2. Using your computer 53