Lucent Technologies Host-Based Controller Modem AT Data Addendum page 9

Data Addendum
June 15, 1998
AT Command Reference (continued)
The ATI11 result has two pages; the user must hit a key to get the second page. See the following example:
ati11
Description
---------------
1 Last Connection
2 Initial Transmit Carrier Rate
3 Initial Receive Carrier Rate
4 Final Transmit Carrier Rate
5 Final Receive Carrier Rate
6 Protocol Negotiation Result
7 Data Compression Result
8 Estimated Noise Level
9 Receive Signal Power Level (-dBm) 25
10 Transmit Signal Power Level (-dBm) 16
11 Round Trip Delay
Press any key to continue; ESC to quit.
12 Near Echo Level
13 Far Echo Level
14 Transmit Frame Count
15 Transmit Frame Error Count
16 Receive Frame Count
17 Receive Frame Error Count
18 Retrain by Local Modem
19 Retrain by Remote Modem
20 Call Termination Cause
21 Robbed-Bit Signaling
22 Digital Loss
23 Remote Server ID
OK
The ATI11 command may be issued from on-line command mode or after the end of a call. After a call, some of
the values are no longer valid; it's useful to know which ones.
Each of the line items in the ATI11 result is explained next:
1. V.90, 56K, V.34, or V.32 depending on the type of connection negotiated.
2. Initial upstream rate
3. Initial downstream rate
4. Current or final upstream rate
5. Current or final downstream rate
6. LAPM or MNP or None, depending on V.42 negotiation
7. V42bis or MNP or None, depending on V.42 negotiation
8. Mean-square error of received downstream signal. Difference between received constellation point and
reference decision point. This is a dimensionless decimal number, only valid during a call. Higher numbers
are worse. There's no absolute threshold of goodness; it depends on the downstream data rate. The number
varies during a call, so it can be useful to sample it a few times.
9. The received signal power, although labeled -dBm, is only a relative measure for comparing calls to/from
different locations. Only valid during a call.
10. Upstream transmit signal power.
11. Round-trip delay in milliseconds.
12. Echo levels are valid for V.34 only.
13. Echo levels are valid for V.34 only.
14. Number of LAPM frames sent upstream during this call. Count wraps around at 65535.
15. Number of REJ frames received at the analog client modem.
16. Number of LAPM frames received by client during this call. Count wraps around at 65535.
17. Number of frames received in error by the client.
18. Number of retrains or rate renegotiations requested by this modem.
19. Number of retrains or rate renegotiations requested by remote modem.
Version 1.0
K56flex connection
------------------
56K
28800
50000
28800
50000
LAPM
V42bis
152
(msec) 4
(-dBm) NA
(-dBm) NA
3
0
0
0
0
0
0
00
(dB) 6
4342C3
Lucent Technologies Inc.
Host-Based Controller Modem
V.90 Connection
---------------
V.90
28800
49333
28800
49333
LAPM
V42bis
152
25
16
4
NA
NA
3
0
0
0
0
0
0
00
6
NA
AT Command Set
9