

		     Firmware 6.13 release note	     07-18-1994
		   ------------------------------


New feature:

Voice


   1. Add a new	3-bit ADPCM voice compression scheme, use AT+VSM=30 to select
	this mode. In this new format, every 5 samples of compressed data is
	packed into 2 bytes, the extra bit is set to 1 for resync.

	byte 1 : Ŀ  byte 2 : Ŀ
		 1AAABBBC	     CCDDDEEE
		 	     

	1 : resync bit.
	A A A :	first  sample
	B B B :	second sample
	C C C :	third  sample
	D D D :	forth  sample
	E E E :	fifth  sample
		
   2. Add a new	4-bit ADPCM voice compression scheme, use AT+VSM=4 to select
	this mode. Two samples of compressed data is packed into 1 byte.
	It is necessary	to increase the	DTE speed to 57600 bps to use this
	compression scheme.

		 Ŀ
		 AAAABBBB
		 

	A A A A	: first	 sample
	B B B B	: second sample

    3. Accept hardware flow control for	voice data flow, use the command
	"AT+FLO=2" to enable the hardware flow control.	(default value is
	"AT+FLO=1").


Improvement:

FAX

1. Improved 2-D	high resolution	graphic	quality	on E model.

2. Fax receiving speed is command configurable on class	2 and
   class 2.0 now.

Modem

1. High	DTE speed AT auto-baud detection problem on E model fixed

2. Ring	volume control (ATNn) bug fixed

3. V.23	answer tone detection bug fixed.

4. V.26bis performance improved

5. V42 block resent count will have a wrong count when remote modem is busy,
   this	bug is corrected.

6. Modem automatically disables	terminal aborting if async leased line is
   set.

7. Modem can now accept	V.25bis	async command in sync-data (&M1) mode.

8. Set bit 7 of	S52 to select space or mark as the first signal	of the
   V.23	handshaking sequence.

9. The bug of modem disconnecting the line after second	ATO1 command
   is fixcd.

10. ATA	will not cause "ERROR" response	now if modem is	already	off hooked on
    EG+	model.

11. Will detect	V22bis carrier longer to recognize it as a carrier presence
    to improve compatibility.

12. Hook flash time can	be adjusted by setting S56, unit value is 10 ms.

13. Hardware reset (press D/V button on	E, E+ or ENTER key on S+ while
    powering on) will only reset profile 0 and 1 but profile 2 and 3
    will not be	affected.


