[f-nsp] Brocade RX-4 to Cisco - Light but no link

[Franz Georg Köhler]

On Mi, Sep 06, 2017 at 07:53:57 +0000, Derek Maxwell <derek.maxwell at chosentechgroup.com> wrote:
> 
> We have a Brocade/Foundry RX-4 with (2) 24 port fiber cards
> (RX-BI-24F) and (2) 24 port copper cards (RX-BI-24C). One of our
> transit providers is NTT, with whom we have a single GigE circuit
> delivered over single mode fiber. It is a multi-km run, from 800 South
> Hope to One Wilshire, then on to 900 North Alameda in LA, but well
> within normal LX transceiver range. While we see light (neg 11
> received)  in optical monitoring, we cannot get a link to establish.
> No combination of auto-negotiate / manual speed settings on our side
> or NTT’s has been able to get a link up.

When light levels are OK but there is no link this can be because of 
speed mismatch. Are both sides fixed on the same speed (1000 in this 
case)?