Message Waiting LEDs - Avaya / Lucent Partner Systems ?

Edwards Finance > Phones

Q. Does anyone know where I can get message waiting LEDs that will work with a regular analog phone attached to an Avaya Partner phone system? Does anyone have the technical specs on how the message waiting LEDs work with this system?

A. Partner systems superimpose about 24vac over the voice pair to light message LED's on analog phones. The 206E's must be R3.1 or higher to light message LED's on analog phones. Lucent (now Avaya) made a small external Message Waiting indicator. It is a small box with a short pigtail modular cord. Sorry I don't have a material code for it, only used 2 on an install about 4 years ago. Here's how it really works in the Lucent PABX's. Many other Lucent PABX units that support analog phones often use the same MWL system as used in the Partner. Definity, Magix, and Merlin Legend, for example. When the phone is "on-hook," the DC voltage between tip and ring is steady at about 46 to 50 volts. To "blink" the MWL in the phone, the PABX briefly (for about 1/2 second) drops the DC voltage on tip and ring to 0 volts. Then it brings it back up to 48V. This repeats about every 5 seconds. Each time the tip-ring voltage drops and then pops back up to 48V, the MWL circuit attached to the LED in the phone will make the LED blink. Almost all AT&T/Lucent/Avaya analog phones that are designed for use with their PABX systems come with a MWL that responds to this signal. For example, 8101, 8110, 6210, 6220, and 2500MGYK are all equipped with this kind of MWL. On the other hand, phones with a "neon" MWL won't respond at all to the Lucent type MWL signal, since the voltage from tip to ring has to go UP, from 48V to about 90V, to make a neon MWL light up. Note that the periodic voltage change in the Lucent system GOES THE OTHER WAY, from 48V down to 0V, to make the MWL LED blink. Interestingly, the LED MWL circuit used in the Lucent phones is able to respond to BOTH types of MWL signals, so the Lucent phones will work with PABX station ports equipped with either "low voltage" or "90V neon" MWL systems. There are a few other manufacturers besides Lucent that also make analog phones that will respond to the Lucent low-voltage MWL signal: Scitec ( http://www.Scitecinc.com ) does, and so does Nortel/Aastra (Nortel calls this a "voltage MWL"). Also, there a some add-on MWL units that can be hooked up in parallel with an existing phone, for example, from Telephone Equipment Supply: http://www.tesmw.com/index.html

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