Basic question regarding sync and async serial interfaces...
Ed Simmons
I just put together a home lab and am still pretty wet
behind the ears. :)
Is it okay to connect a sync serial interface to an async
serial interface using a crossover DTE/DCE cable? I have a
2521 router and I'd like to try out the async interface by
connecting it to a 2501's sync interface.
Also, does anyone happen to know where on Cisco's website
they have a user's manual for the Cisco 2521 router? I've
searched everywhere but haven't had any luck tracking it
down.
Thanks very much!!!
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Barry Margolin
Ed Simmons <e...@nospam.com> wrote:
> **** Post for FREE via your newsreader at post.usenet.com ****
>
> I just put together a home lab and am still pretty wet
> behind the ears. :)
>
> Is it okay to connect a sync serial interface to an async
> serial interface using a crossover DTE/DCE cable? I have a
> 2521 router and I'd like to try out the async interface by
> connecting it to a 2501's sync interface.
I don't think so. Sync and async are different Layer 1 implementations.
> Also, does anyone happen to know where on Cisco's website
> they have a user's manual for the Cisco 2521 router? I've
> searched everywhere but haven't had any luck tracking it
> down.
I don't think they have anything called a "user manual". They have IOS
configuration guides and command references, which are for all the
IOS-based routers. The model-specific documentation mainly just covers
installation, to deal with the different types of interfaces and
electrical connections.
--
Barry Margolin, bar...@alum.mit.edu
Arlington, MA
David M
>**** Post for FREE via your newsreader at post.usenet.com ****
>
>I just put together a home lab and am still pretty wet
>behind the ears. :)
>
>Is it okay to connect a sync serial interface to an async
>serial interface using a crossover DTE/DCE cable? I have a
>2521 router and I'd like to try out the async interface by
>connecting it to a 2501's sync interface.
From:-
Product Announcement
I.D. Number: 122PA Cisco 2520砲isco 2523 Series
:Cisco 2521: One Token Ring, two high-speed
:synchronous serial, two low-speed
:synchronous/asynchronous serial, and one ISDN BRI
Should not be a problem if you use one of the two A/S interfaces - these are
capable of sync and async.
From memory the A/S interfaces act as sync unless configured as async.
The other difference is that they have a low maximum clock rate for data
transfer.
>Also, does anyone happen to know where on Cisco's website
>they have a user's manual for the Cisco 2521 router? I've
>searched everywhere but haven't had any luck tracking it
>down.
It is probably hidden away in some obscure corner of the router product
information page on the Cisco website. (Like the routers Listed in the right
hand column 2500 series router -> discontinued products)
There is no specific manual for this model as the variants had more in
common than difference.
Hansang Bae
> I just put together a home lab and am still pretty wet
> behind the ears. :)
> Is it okay to connect a sync serial interface to an async
> serial interface using a crossover DTE/DCE cable? I have a
> 2521 router and I'd like to try out the async interface by
> connecting it to a 2501's sync interface.
2501's are not capable of doing async so you are out of luck. What you
can do is connect the AUX port on the 2501 to the async port of the
2521.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
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Ed Simmons
Hansang Bae <uo...@alp.ee.pbz> wrote in
news:MPG.1b75d23bb...@news-server.nyc.rr.com:
> 2501's are not capable of doing async so you are out of
> luck. What you can do is connect the AUX port on the 2501
> to the async port of the 2521.
Um, how would this be done physically? I mean, since the AUX
port takes an RJ-45 connector, how would I connect this to
the serial port which has a 60-pin connector?
I wish I could find a good source of documentation for all
this connectivity stuff. It's frustrating doing this guess
work.
Thanks so much for your help!
Dan Swartzendruber
uo...@alp.ee.pbz says...
> In article <Xns95367F337...@127.0.0.1>, e...@nospam.com says...
> > I just put together a home lab and am still pretty wet
> > behind the ears. :)
> > Is it okay to connect a sync serial interface to an async
> > serial interface using a crossover DTE/DCE cable? I have a
> > 2521 router and I'd like to try out the async interface by
> > connecting it to a 2501's sync interface.
>
> 2501's are not capable of doing async so you are out of luck. What you
> can do is connect the AUX port on the 2501 to the async port of the
> 2521.
remember the speed limitation on the aux port though...
Hansang Bae
> Um, how would this be done physically? I mean, since the AUX
> port takes an RJ-45 connector, how would I connect this to
> the serial port which has a 60-pin connector?
>
> I wish I could find a good source of documentation for all
> this connectivity stuff. It's frustrating doing this guess
> work.
You don't use the 60pin cable. What you would use is a RS232 cable (60
pin on one side and DB25 on the other). Then you use the modem adapter
and a Cisco rollover cable.