<p>I am new to the group but have searched the doc's FAQ's etc before posting here.</p><p> 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.</p><p>BT Have installed a NTBK50AA E1-PRI card in the meridian with daughter cards NTBK51AA (D channel) and NTAK20BD (Clocking)</p><p> I have asked BT to configure the card as a Master (Exchange end) E1 Euro ISDN (Just like a standard ISDN30e)</p><p> They claim to have done this in line with the model they use to interface to Cisco routers etc.</p><p> 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)<br /></p><p>I have configured the Zap span for 1 clocking (Primary) 1 line build out, with the framing etc as CCS, HDB3, CRC4</p><p> </p><p>But they don't appear to want to synchronise/talk to each other.</p><p> </p><p>ZTTool claims that the span is up and down more times than a fiddlers elbow and the clocking source is internal.</p><p> ( Might I expect the alarm state to be constant if the framing etc was matched and the clock source to show as external ??)<br /></p><p> </p><p>The alarms are cylcling from red to red/yellow and finaly to red/yellow/recover before falling back to red and starting again.</p><p> I think I may be missing something that is probably blindingly obvious to someone in the know.</p><p> 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...</p><p>Please can somone help and point me (and I guess by extension the BT guy) in the right direction.</p><p> </p><p>Cheers</p><p> </p><p>Andy </p><p> </p><p> </p><p> </p><p> </p><p> </p><BR>