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Originally Posted by watasav
I have the atten on the receive on both ends. The heartbeat is slow pulse
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Good, that means you are close. The slow heartbeat means the send and receive are correct. Did you get an assortment of attenuators, or just one for each end? Single mode fiber runs are optimized for a 0dB loss end to end. However the PBX wants the signal to be at -17dB.
If you already know the following, skip the lecture and go to the next paragraph. Attenuation is done by progressively darker glass in the attenuators and it needs to be the same attenuation at each end.
The most common reason for the problem you are having is too much or too little attenuation. There is a number on the outside of the attenuator, is it the same at both ends?
One last question, how is the heartbeat on the TN570 in the G650? The TN573 has a slow heartbeat so the receive fiber is good there, but if the receive fiber at the G650 is not happening; then either the fiber leg is bad or there is too much attenuation.
I have also seen this problem go away if the attenuation is put on the transmit side. You could give that a try if everything else seems ok.