Basic question regarding sync and async serial interfaces...

Discussion in 'Cisco' started by Ed Simmons, Jul 30, 2004.

  1. Ed Simmons

    Ed Simmons Guest

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    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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    Ed Simmons, Jul 30, 2004
    #1
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  2. I don't think so. Sync and async are different Layer 1 implementations.
    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, Jul 31, 2004
    #2
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  3. Ed Simmons

    David M Guest

    From:-
    Product Announcement
    I.D. Number: 122PA Cisco 2520–Cisco 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.
    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.
     
    David M, Jul 31, 2004
    #3
  4. Ed Simmons

    Hansang Bae Guest

    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

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    Hansang Bae, Jul 31, 2004
    #4
  5. Ed Simmons

    Ed Simmons Guest

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    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!

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    Ed Simmons, Jul 31, 2004
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  6. remember the speed limitation on the aux port though...
     
    Dan Swartzendruber, Aug 1, 2004
    #6
  7. Ed Simmons

    Hansang Bae Guest

    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.


    --

    hsb

    "Somehow I imagined this experience would be more rewarding" Calvin
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    Hansang Bae, Aug 1, 2004
    #7
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