I just acquired a Lucent MLX-10DP phone but don't have a compatible Merlin system; I plugged it into a Merlin Plus (820D) and subsequently found a description of the RJ-45 pin assignments which showed that power (-48VDC) is on pair 4 for MLX as opposed to pair 3 for ATL phones. Later I supplied -48VDC to the correct pair to the MLX phone but even though internally I can read 5VDC on various parts, the LCD remains blank and no LEDs light. Should there be any sign of life with just DC applied? I have a suspicion that the phone was defective beforehand but would like to know how a good one should behave with only DC and no other signals applied to it.
Also how likely are the station ports on the 820D into which the MLX was plugged to have been damaged by it? It would seem unlikely unless
48V were somehow looped back to the control pair.
TIA,
Michael