Multi-Tech Systems MT5600SMI-92, MT5600SMI-XL34 manual Register Unit Range Default Description S86

			Chapter 5 – AT Commands, S-Registers, and Result Codes
Register Unit	Range	Default	Description
S86	0–26	21	Call Failure Indication. When the modem issues a NO CARRIER
			result code, a value is written to S86 Register to help determine the
			reason for the failed connection. S86 records the first event that
			contributes to a NO CARRIER message. The code definitions are:
			S86=0	Normal hangup, no error occurred.
			S86=1	Reserved.
			S86=2	Reserved.
			S86=3	Call Waiting caused disconnect.
			S86=4	Physical carrier loss.
			S86=5	No error correction at the other end.
			S86=6	No response to feature negotiation.
			S86=7	This modem is async only; the other modem is sync only.
			S86=8	No framing technique in common.
			S86=9	No protocol in common.
			S86=10	Bad response to feature negotiation.
			S86=11	No sync information from the remote modem.
			S86=12	Normal hangup initiated by the remote modem.
			S86=13	Retransmission limit reached.
			S86=14	Protocol violation occurred.
			S86=15	Lost DTR.
			S86=16	Received GSTN cleardown.
			S86=17	Inactivity timeout.
			S86=18	Speed not supported.
			S86=19	Long space disconnect.
			S86=20	Key abort disconnect.
			S86=21	Clears previous disconnect reason.
			S86=22	No connection established.
			S86=23	Disconnect after three retrains.
			S86=24	Call Waiting tone detected.
			S86=25	Extension pickup detected.
			S86=26	Remote hangup detected.

S91	dBm	0–15	10	PSTN Transmit Attenuation Level. In non-PCM modes (V.90 or
				K56flex are PCM modes), S91 sets the transmit attenuation level from
				0 to 15 dBm for the PSTN mode, resulting in a transmit level from 0 to
				-15 dBm. In some countries, the transmit level may not be changed
				and there are checks to prevent transmit attenuation level change.
				The default is country dependent.
S95			0	Extended Result Codes Control. A bit set to a 1 in this parameter,
				in conjunction with the W command, will enable the corresponding
				extended result code. *

The +MR, +ER, and +DR settings also control S95 bits 2, 3, and 5, respectively. The more recent settings of +MR, +ER, and +DR, or host writing of S95 bits 2, 3, and 5, along with the W command setting, determine the corresponding actual result code reporting (see +MR, +ER, DR, and W commands).

Bit 0 CONNECT result code indicates DCE speed instead of DTE speed. Bit 1 Append/ARQ to CONNECT XXXX result code in error-correction

mode (XXXX = rate).

Bit 2 Enable +MCR: XXXX result code (XXXX = modulation) and +MRR: XXXX result code (XXXX = rate). (Also, see +MR.)

Bit 3 Enable +ER: XXXX result code (XXXX = protocol identifier). Bit 4 Reserved.

Bit 5 Enable +DR: XXXX result code (XXXX = compression type). Bits 6-7 Reserved.

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 81