UART 16950 Question

[jfall]

I have the old UART 16550. I go a new external modem , and it recommemds that i have a UART 16750 chipset to get 230kbs dte speed instead of 115kbs.So if i where to get a PCI
card with a port for UART 16950, would there be a problem becuase its not UART 16750?

 

[esung]

What modem is that? not a regular POTS modem? If I remember correctly, the major difference between 16450,16550,16750 and 16950 are the different size of FIFO, 16450 has 16Byte, 16550 has 32Byte, and 16750 has 64byte, and 16950 has 128byte FIFO. the higher FIFO enable you to reach a higher maximum transfer rate. You shouldn't have any problem running the modem through 16950 UART...

but I'm just curious why there'a modem that'll recommend such high speed...

 

[Zach]

If it's a 56K it really wont matter.. I run mine at 56000bps serial prot half the time, to make sure it can talk to my DSL router (bad cable maybe) and there's no speed difference between that and full speed.