Product data

USRobotics
Command Reference
Data Command Set - 76
%TT - PTT Test Command
This command facilitates PTT testing of signal levels by providing continuous
signals regards of whether or not the modem is connected to the line. The signal
transmitted is in accordance with the parameter provided.
A range of commands allows the user to initiate a series of signals required to
obtain PTT approval. The signals emitted include answer tone, modulation,
carriers, and other pertinent signals. A test is initiated upon receipt of a %TTn (the
second T is a password and n is a test number), and the test is aborted when any
keyboard character is entered. The modem will continuously transmit the tone or
carrier according to the parameter supplied.
Syntax
%TT0x x corresponds to the desired DTMF dial digit (0, 1, 2, 3, 4, 5, 6, 7, 8,
9, *, #, A,B,C, or D).
0 Dial digit 0
1 Dial digit 1
2 Dial digit 2
3 Dial digit 3
4 Dial digit 4
DIAG <2A4D3263 30=00 31=03
32=01 33=01>
No carrier loss events, 3 carrier rate renegotiations attempted; 1 carrier
retrain requested; 1 carrier retrain granted
DIAG <2A4D3263 34=7080
35=CB20>
Final transmit rate is 28800 bit/s; final receive rate is 52000 bit/s
DIAG <2A4D3263 40=1 41=100> LAPM negotiation completed; frame size = 256
DIAG <2A4D3263 42=0 43=0> No error control timeout or link NAKs
DIAG <2A4D3263 44=1 45=400> V.42bis data compression used; dictionary size = 1024
DIAG <2A4D3263 50=2 51=2> Hardware transmit and receive flow control
DIAG <2A4D3263 52=343CC
54=0>
213964 DTE characters transmitted, w/o underrun
DIAG <2A4D3263 53=7230E6
55=47>
7483622 DTE characters received, 71 characters lost due to receive data
overrun
DIAG <2A4D3263 56=29D
58=0001>
597 (decimal) frames transmitted, with 1 frame error
DIAG <2A4D3263 58=2A4B
59=0004>
10827 (decimal) frames received, with 4 frame errors
DIAG <2A4D3263 60=51> Local PC initiated hangup
Table 3-12: Completed Data Call, with Some Errors and Rate Retrain during the Call
Modem Response line Description