Are there any initialization strings that will improve the V.90 performance of my Agere (Lucent) chipset based Zoom 56K Dualmode PCI modem? If so, where do I put them in Dial-Up Networking?

This solution applies to Windows 2000 and XP. If you are using Windows 95, 98, or ME, please see SmartFact #180.

Along with other factors (e.g., line noise, server conditions, amount of other traffic online, operating system or communications software problems), the problem(s) you are experiencing may be influenced by what modem initialization string you are using -- if any. Try the following init strings (whichever works best for you) by highlighting your modem's name in Control Panel | Phone and Modem Options - Modem and clicking Properties, then Advanced and entering these init strings one-at-a-time in the Extra Settings field:

ATW2S7=150S38=0-V90=1
AT&F-V90=1S7=150
AT&F-V90=1\N3
AT&FS38=0-V90=11
AT&F&C1&D2\N5\A2-V90=1S7=100

Note that "1" is a one and "0" is a zero.

The above are recommended settings, but you can change the value of -V90 to set a downstream limit. For example, as in the fourth init string above, -V90=11 limits the downstream rate to 40000 kbits/s, which may be more reliable on less-than-optimal phone line conditions. Below are possible values for -V90.

-V90=n	Downstream Rate
0	V.90 Disabled
1	Auto Rate (default)
2	28000 kbit/s
3	29333 kbit/s
4	30666 kbit/s
5	32000 kbit/s
6	33333 kbit/s
7	34666 kbit/s
8	36000 kbit/s
9	37333 kbit/s
10	38666 kbit/s
11	40000 kbit/s
12	41333 kbit/s
13	42666 kbit/s
14	44000 kbit/s
15	45333 kbit/s
16	46666 kbit/s
17	48000 kbit/s
18	49333 kbit/s
19	50666 kbit/s
20	52000 kbit/s
21	53333 kbit/s