When analogue modems are answering a call from any analogue or digital modem, i. Your modem It must support the MOH and have the software to manage it. By using this site, you agree to the Terms of Use and Privacy Policy. Previously the speed was limited to a For the most part, K56Flex and X2 are no longer supported, so don’t use these standards in your modem selection consideration. As long as you do not turn off the modem, the subsequent time to connect should be noticeably faster. In this FAQ we discuss the two types of modem connections:

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Previously the speed was limited to a It is the speed between the two modems. Those settings are saved in volatile memory.

Cisco WIC-1AM-V2-REF – Fax / modem – 56 Kbps – K56Flex V V – for 3G | eBay

The amount of compression is directly related to the file type. X2 by 3Com – formerly USR: This is the port speed between the local computer port and the local modem. Please help improve this article by adding citations to reliable sources. Comparison of the efficiency of data compression with the V.


Under the best conditions, 56K modems top speed in the US is This is particularly useful for lines that have call waiting. Asymmetric means the upstream speed the data you send is different than the downstream speed the data you receive. If your DTE setting is lower than the highest possible modem speed, you are basically telling your modem to slow down that is not a good thing.

Digital modems, while primarily answer calls, are usually capable of originating calls also.

List of ITU-T V-series recommendations

This allows the connection to be temporarily severed and then reconnected, reducing the possibility of dropped connections. Distance you are from your central office. These speeds are usually, almost always, different. Noise on the phone line you may not be able to hear.

You can see that the pkzip is much more effective than any modem compression, and the difference in the k56fflex between the pkzip and V.

They are defined by the UART settings and are very specific: That is, if you have a If you have a 56K modem you should make your setting at K56Flex by Conexant – formerly Rockwell.

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Two major factors iru connection speed for a given modulation are: These claims are NOT real world. Faster Connection Negotiation Quick connect — appx seconds — vs V.


This is the TRUE speed between the modems. The DCE speeds are unique to the modulation. The ISP can set the time from 0 to 16 seconds or wait indefinitely.

Faster Connection Negotiation Time. Here is a site that ran actual throughput tests: Text files are usually most compressible.

Pulse-code m56flex or PCM allows higher rate digital transmissions over the analog phone lines. Since the second and subsequent calls would not need to make those calculations, subsequent connection times will usually be shorter. As long as you do not turn off the modem, the subsequent time to connect should be noticeably faster.

ITU-T surmised that once your modem makes the calculations for the first connection, these calculations should not change unless you change locations. From Wikipedia, the free encyclopedia. The actual time you are allowed to put the modem on hold is controlled by the ISP.