Let's say you have 20 amplifiers in a single daisy-chain and the NLB 60E reports only 12 devices. This can be due to one of the following situations:
1. The cable is disconnected (or malfunctioning) between the 12th and the 13th amplifier.
2. You have mistakenly connected the OUT port of the 11th device to the OUT port of the 12th device.
3. The total length of the cables in the network exceeds the maximum allowed.