[asterisk-dev] Opening multiple zap channels for reading / writing

[Chris Tooley]

On Wed, Jul 21, 2010 at 7:59 AM, Kevin P. Fleming <kpfleming at digium.com> wrote:
> On 07/21/2010 02:43 PM, Muhammad Ali wrote:
>> Hi,
>>
>> I want to open multiple zap channels for reading writing , one way i see
>> of doing it is using  "open("/dev/zap/channel")" and specifying
>> respective channel. The problem in this approach is i want to send /
>> receive data distributed over multiple channels.
>>
>> To clarify the application , please consider the following description:
>>
>> Main purpose of doing this is to Transmit ETHERNET data over TDM on per
>> channel basis. Suppose i am to send 1500 bytes of packet over TDM. And i
>> only have 2 TDM channels available. How would it be done ?
>>
>> I am currently able to Transmit and Receive on single channel but i
>> require more bandwidth to increase my throughput.
>> the only way i knw of accessing zap channels is through /dev/zap/channel
>> interface.
>>
>> If there is a way i can open multiple zap channels as single unit ??
>> like 3 channels acting as one ? so i have a greater bandwidth.
>>
>> I hope i make sense.
>>
>> If there is a better way of doing so, kindly guide me .
>
> You should really switch to DAHDI, as Zaptel is no longer maintained.
>
> If you are defining these channels as 'clear' in the configuration file,
> then you can bond them together by specifying them as channel groups
> like "clear=1-4". If you did this, you can open only channel 1, but when
> you read and write data it will actually be transmitted over channels 1
> through 4.
>
> Also keep in mind that Zaptel and DAHDI both already contain TDMoE
> modules that can transmit Ethernet data over TDM links.
>
I didn't realize EoTDM was supported as well as TDMoE. Handy.

> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
>
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Chris Tooley
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