Lucent Technologies Host-Based Controller Modem AT specifications Lapm

Data Addendum	Host-Based Controller Modem
June 15, 1998	AT Command Set
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			K56flex connection	V.90 Connection
	---------------			------------------	---------------
1	Last Connection			56K	V.90
2	Initial Transmit Carrier Rate			28800	28800
3	Initial Receive Carrier Rate			50000	49333
4	Final	Transmit Carrier Rate		28800	28800
5	Final	Receive Carrier Rate		50000	49333
6	Protocol Negotiation Result			LAPM	LAPM
7	Data Compression Result			V42bis	V42bis
8	Estimated Noise Level			152	152
9	Receive Signal Power Level (-dBm) 25				25
10	Transmit Signal Power Level (-dBm) 16				16
11	Round Trip Delay		(msec) 4		4
Press any key to continue; ESC to quit.
12	Near Echo Level		(-dBm)	NA	NA
13	Far Echo Level		(-dBm)	NA	NA
14	Transmit Frame Count			3	3
15	Transmit Frame Error Count			0	0
16	Receive Frame Count			0	0
17	Receive Frame Error Count			0	0
18	Retrain by Local Modem			0	0
19	Retrain by Remote Modem			0	0
20	Call Termination Cause			0	0
21	Robbed-Bit Signaling			00	00
22	Digital Loss		(dB)	6	6
23	Remote Server ID			4342C3	NA

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 After a call, some of the values are no longer valid; it's useful to know which ones.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 godness; 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 Lucent Technologies Inc. 9