So this all turned out to be a problem with the VM configuration on their kit.
Each end of the Arcutronix kit needs pairing with the other, this pairing was bad so the LPT/RFD was shutting down the port at each end. This combined with the fact that the admin gateway IP was wrong on one end (thus VM couldn't remote configure it). The engineer VM sent to site also had very little clue and knew very little about the Arcutronix kit, eventually I had to politely wrestle his laptop off him and reconfigure it myself - it now works fine. The other gotcha is that the Arcutronix kit only seems to support 1634 MTU - which sucks! Sent from my iPhone On 19 Aug 2013, at 08:48, Rick Hodger <[email protected]> wrote: > On 2013-08-17 10:38, Ben King wrote: > >>>> VM are now trying to argue that it's because it's too close, ie below >>>> LX minima link (2m patch lead). However we know their optics light >>>> when in our kit and while I know it's a bit short and ultimately it's >>>> probably shortening the life of the optics but fundamentally I think >>>> it should work. > > If you're worried about the optics, get yourself some optic attenuators. > They're can be had for less than 10 quid and they are used to increase the db > value in situations just like this, usually with an air gap or a doped fibre. > > Rick Hodger >
