Notes and Comments
This modem was supplied by Conexant (and Rockwell before it) to modem Manufacturers as a model to use during design of their own modems. This was also used as a controller-less reference design by swapping out the 20410-14 HSF chip for a R6785-xx HCF chip--one design, 2 modems; drivers are not compatible between the two.
This board was replaced by the 2-layer RD00-D200-051 board (probably the pictured-modem). The 11229-12 LSD chip (this board) was replaced by a 11229-14 chip.
The chipset is capable of worldwide country support as long as a World Class DAA is fitted by the OEM. Country selection is then via the AT+GCI command, which selects from Country parameters placed into the Registry by the .INF file during installation of the modem.
Simple admin mistakes by Rockwell, compounded by OEM sloppiness, has led to driver hell with many of these modems...
Modems are identified to the OS by codes placed within an EEPROM chip on the board--this site makes use of these same codes to help you ID your own modem if you need to (Search link at top). Since some OEMs are such cheapskates that they do not even include an EEPROM chip, the drivers also include default IDs.
Rockwell gave early versions of this modem PCI Device IDs of 2003, 4, 5 or 6. These codes are the same as other--completely different--Conexant chipsets (whoops). Later versions had a device ID of 2013, 4, 5 or 6. This is bad enough, but now for the mistake. As noted above, these boards were a co-design with HCF (controllerless) modems. Some HSF modems got given the HCF-ID of 1025, and some HCF modems the HSF-ID of 2005 (this modem) (double-whoops).
We now add to all of the above the change in 1999 from Rockwell (Vendor ID of 127A) to Conexant (14F1) and the same DFS modem needs 4 different IDs to give it a chance of loading a correctly-chosen driver. OEMs, however, have a habit of changing the spec of a modem whilst keeping the name the same, plus have a habit of only putting newer IDs into driver upgrades... If the ID of your modem is not within the driver, it will not load, even if otherwise the driver is fine for the modem.
To summarise, with this modem you need to check first whether you even have the correct type of modem: Soft (this page) or Controllerless (HCF). The only way to be sure is to check the chips on the card. The chipset link at top will lead to a page to discover your modem’s chipset from it’s chips--all chipset pages list all chips used within that chipset. Having found the chipset, you can find the modems with drivers for that chipset. Phew!
The following modems are connected with this modem in some way - often the same modem under a different name, or the other members of a Family of modems. Check out the notes above for (maybe) further details.
Conexant RD00-D100-051 RC56HCF-PCI DFVS Reference Design (FCC)
Conexant RD00-D???-??? RS56-PCI HSF DFT Reference Design
Conexant RD00-D???-??? RS56L-PCI HSF DFVSH-FCC Reference Design
USR 56k SoftModem PCI (3095) (OEM, FCC)
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