[Asterisk-Users] Asterisk & Meridian Tie Line

[Steve Totaro]

Andy Kirby wrote:
>
> I am new to the group but have searched the doc's FAQ's etc before 
> posting here.
>
>  We are attempting tie our asterisk server/service to the building's 
> PBX, the building is in the UK and the local PBX is a meridian option 
> 11 installed and mainteined by BT.
>
> BT Have installed a NTBK50AA E1-PRI card in the meridian with daughter 
> cards NTBK51AA (D channel) and NTAK20BD (Clocking)
>
>  I have asked BT to configure the card as a Master (Exchange end) E1 
> Euro ISDN (Just like a standard ISDN30e)
>
>  They claim to have done this in line with the model they use to 
> interface to Cisco routers etc.
>
>  I have installed a Digium TE411P in our server looped back the span 2 
> port (Gives a green light and OK with same config as span 1) and am 
> using a crossover cable to link the PBX to our server. (We tried a 
> pucker BT cross over cable with exactly the same results as mine and a 
> striahgt through gives us nothing at all, I guess as you might expect)
>
> I have configured the Zap span for 1 clocking (Primary) 1 line build 
> out, with the framing etc as CCS, HDB3, CRC4
>
>  
>
> But they don't appear to want to synchronise/talk to each other.
>
>  
>
> ZTTool claims that the span is up and down more times than a fiddlers 
> elbow  and the clocking source is internal.
>
>  ( Might I expect the alarm state to be constant if the framing etc 
> was matched and the clock source to show as external ??)
>
>  
>
> The alarms are cylcling from red to red/yellow and finaly to 
> red/yellow/recover before falling back to red and starting again.
>
>  I think I may be missing something that is probably blindingly 
> obvious to someone in the know.
>
>  The BT guy has been very good and is trying to help us get this going 
> but seems rather nonplussed with the terms CRC4, CSS and HDB3...
>
> Please can somone help and point me (and I guess by extension the BT 
> guy) in the right direction.
>
>  
>
> Cheers
>
>  
>
> Andy 
>
>  
>

Try your end with every different combination of settings applicable to 
EuroISDN.  I would start by removing the CRC4.  Try something, if it 
doesnt work, put it back and change another setting.
> s
>