Re: Synchronous and asynchronous communication

Gaurav,
it is seen on a 2A/S, no issues there.
I don't have many T modules, they are more expensive than A/S
so you don't use it for labs.

The one I tested is a 1T on a 2610XM.

It might be that newer T modules are flexible.
If you do a "show line" you might get a message indicating:

        Line(s) not in async mode -or- with no hardware support:
        2-231

"with no hardware support" clearly states that some lines do not
support async, IMHO.

Looking at the hardware spec sheets, I see that the HWIC-4T does
async. So there might be our missunderstanding.

-Carlos

GAURAV MADAN @ 31/01/2011 08:59 -0300 dixit:
> Strange ..
>
> Can you give me following :
>
> 1) sh inventory : so that i know which WIC/HWIC are you using in 2811
> ? ( tell me exact hardware where it is seen and where it is not seen )
> 2) IOS in c2800 of 2811 ?
>
> Thnx
> Gaurav Madan
>
> On Mon, Jan 31, 2011 at 5:23 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:
>> Yep, that's a 2A/S interface, not a 2T. That's why I included a show
>> hardware up front! :)
>>
>> -Carlos
>>
>> GAURAV MADAN @ 31/01/2011 08:51 -0300 dixit:
>>> I see "physical-layer" command is present in your 2811.
>>> Thats the command you use to convert .
>>>
>>> Thnx !
>>> Gaurav Madan
>>>
>>> On Mon, Jan 31, 2011 at 5:07 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>
>>> wrote:
>>>> Gaurav,
>>>> at least in the routers I have access to, T interfaces can not do async:
>>>>
>>>> R1#sh hard
>>>> ...
>>>> Cisco 2811 (revision 53.51) with 237568K/24576K bytes of memory.
>>>> Processor board ID FTX1132F033
>>>> 2 FastEthernet interfaces
>>>> 2 Low-speed serial(sync/async) interfaces
>>>> ...
>>>> R1#conf t
>>>> Enter configuration commands, one per line. End with CNTL/Z.
>>>> R1(config)#int s 0/0/0
>>>> R1(config-if)#p?
>>>> physical-layer priority-group pulse-time
>>>>
>>>> R1(config-if)#p
>>>>
>>>> ------------------------
>>>>
>>>> GW#sh hard
>>>> ...
>>>> isco 2610XM (MPC860P) processor (revision 1.0) with 127430K/3642K bytes
>>>> of
>>>> memo
>>>> ry.
>>>> Processor board ID JAE07382264
>>>> M860 processor: part number 5, mask 2
>>>> 1 FastEthernet interface
>>>> 2 Serial interfaces
>>>> ...
>>>> GW#conf t
>>>> Enter configuration commands, one per line. End with CNTL/Z.
>>>> GW(config)#int s 0/0
>>>> GW(config-if)#p?
>>>> priority-group pulse-time
>>>>
>>>> GW(config-if)#p
>>>>
>>>> Can you please test it ?
>>>> -Carlos
>>>>
>>>>
>>>>
>>>>
>>>> GAURAV MADAN @ 30/01/2011 12:57 -0300 dixit:
>>>>> Under Serial-interface issue the command :
>>>>>
>>>>> int serial <>
>>>>> physical-layer async .
>>>>>
>>>>> 1) By default the interface will operate in SYNC mode
>>>>> 2) You can switch between sync and async mode
>>>>> 3) This is applicable to WIC / HWIC -2T , HWIC-1T , HWIC-2A/S etc . On
>>>>> ISRs and ISR-G2 .. Other platform line cards ... I am not sure
>>>>>
>>>>> Thanks
>>>>> Gaurav Madan
>>>>> CCIE
>>>>>
>>>>> On Sun, Jan 30, 2011 at 9:16 PM, Routing Freak <routingfreak_at_gmail.com>
>>>>> wrote:
>>>>>> how to change a interface to syn or asyn
>>>>>> is there any command to change a router serial interface as a asyn
>>>>>> whether ethernet interface has any significance wid sync and async
>>>>>> interface
>>>>>>
>>>>>> On Sun, Jan 30, 2011 at 9:07 PM, GAURAV MADAN
>>>>>> <gauravmadan1177_at_gmail.com>
>>>>>> wrote:
>>>>>>> Communication is called asynchronous if the sender and receiver do not
>>>>>>> need to synchronise before each transmission. A sender can wait
>>>>>>> arbitrarily long between transmissions and the receiver must be ready
>>>>>>> to receive data when it arrives.
>>>>>>>
>>>>>>> Synch. transmission agree to clock rate before the data transmission
>>>>>>> occurs .
>>>>>>>
>>>>>>> Example would be : Serial interface which can work in sync as well as
>>>>>>> async mode .
>>>>>>> In sync mode ; you have to configure clock rate on DCE and then only
>>>>>>> data transmission occurs .
>>>>>>>
>>>>>>> Async serial interfaces ; there is no funda of clock rate CLI .
>>>>>>>
>>>>>>> I hope I made things clearer .
>>>>>>>
>>>>>>> Gaurav Madan
>>>>>>> CCIE
>>>>>>>
>>>>>>> On Sun, Jan 30, 2011 at 3:14 PM, Routing Freak
>>>>>>> <routingfreak_at_gmail.com>
>>>>>>> wrote:
>>>>>>>> Can anyone tell me what is the difference between the synchronous and
>>>>>>>> asynchronous communication in routers,switches and hosts
>>>>>>>>
>>>>>>>>
>>>>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>>>>
>>>>>>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>> --
>>>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>>>
>> --
>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net