[Asterisk-Users] Zaptel DACS and FDL

[Eric Wieling]

Jerry wrote:

> 
> On Feb 16, 2005, at 7:19 PM, Eric Wieling wrote:
> 
>> Jerry wrote:
>>
>>> On Feb 16, 2005, at 3:07 PM, Eric Wieling wrote:
>>>
>>>> I have the following configuration:
>>>>
>>>> CLEC -> T-1 -> Asterisk -> Adtran Channel Bank -> (analog) -> Nortel
>>>>
>>>> Don't complain that it's ugly.  I've already done plenty of that.
>>>>
>>>> The CLEC manages their Adtran remotely and needs to be able to 
>>>> continue to do so.  I assume they use FDL to do the management.  We 
>>>> are using the Zaptel DACS/DACSRBS to cross connect some of the 
>>>> channels directly between the CLEC and the Adtran.  These are 
>>>> channels we don't really care about (data, other voice, etc).  We 
>>>> are not cross connecting all the channels, just some of them.
>>>>
>>>> I'm wondering if/how I can make sure the remote management via FDL 
>>>> continues to work.  Does anyone have any information on this or 
>>>> suggestions or anything?
>>>
>>> What you dropped from your diagram is the T1 from * to the channel 
>>> bank. FDL is a link level protocol. It is carried in the framing bits 
>>> of the T1 not within the payload bits. When you use the digium (I 
>>> presume) card within your * server as a DACS this is connecting the 
>>> payload, ie timeslot, bits from one port to another. FDL will not 
>>> work this way.
>>
>>
>> DACSRBS does DACS the robbed bit signalling.  I assume this won't 
>> help?   Ah well.  We'll try to find some other way to do
> 
> 
> Robbed bit refers to robbing a bit from the payload - hence the name - 
> and the reason you can only get a 56k channel on links utilizing this 
> form of signalling - vs 64k when not.

Yes, but does FDL run over the per channel robbed bit signalling or 
does it run over the T-1 signaling.  i.e. Does FDL run using ESF 
(applies to the whole T-1) or does it run on the robbed bit signaling 
for specific channels?