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RE: WAN - serial link and RS-232 serial link [7:41670] posted 04/17/2002
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I got my numbers from Cisco's Internetworking Terms and Acronyms (not 
that  Cisco is always right ;-) It says RS-232 was limited to 64 Kbps and 
that RS 449 is 2 Mbps.

Here what that document says about RS-530:

Refers to two electrical implementations of EIA/TIA-449: RS-422 (for 
balanced transmission) and RS-423 (for unbalanced transmission).

I don't think the actual numbers matter to answer the fellow's question. 
The bottom line is that serial doesn't mean slow.


At 07:56 PM 4/16/02, Steve Watson wrote:
>I believe you are incorrect. RS-232 supports up to 128k. RS-449 was the
>successor to 232 but the mechanics and signaling were off so the RS-530
>was born to support up to 2mb and also supported the RS-232
>-----Original Message-----
>From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
>Priscilla Oppenheimer
>Sent: Tuesday, April 16, 2002 7:33 PM
>To: cisco@xxxxxxxxxxxxxx
>Subject: Re: WAN - serial link and RS-232 serial link [7:41670]
>WANs (and LANs) use serial communication (one bit at a time). The only
>thing I can think of that uses parallel communication is old-style
>A serial interface can still be very fast. On the WAN side, RS-232 only
>supported speeds up to 64 Kbps. But RS-449 supports speeds up to 2 Mbps.
>Most WAN interfaces support RS-499, which is known as EIA/TIA-499 today.
>And then there's also HSSI which is 52 Mbps, and probably others that I
>can't think of off the top.
>At 07:01 PM 4/16/02, rtiwari wrote:
> >Why WAN connection is called serial link. Is it same like
> >RS-232 serial link. If it's same then at a time we can transmit
> >only one bit.In this case WAN link will be having slower
> >bit transmission.
> >or WAN - serial link and RS-232 serial link are different.
> >Please reply
> >-Ravi
>Priscilla Oppenheimer

Priscilla Oppenheimer

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