Instruction manual

Page 1136 of 3156 CLASS: Visual Message Waiting Indicator
553-3001-306 Standard 10.00 January 2002
Operating parameters
This feature has been developed for the North American residential market,
as well as for the small business, hospitality, schools and universities, nursing
homes and hospitals, and mobile home markets.
When a craftsperson uses Overlay 10 to administer a service change to a
CLASS set, if the Meridian 1 software identifies, during overlay wrap-up,
that the CLASS VMWI feature is waiting to send a visual indication to the set
being serviced, a SCH1099 message will be generated, indicating that the
VMWI pending message is lost and no retry will be attempted. The service
change itself does not trigger any messages to the set.
Some CLASS sets, like the Nortel Networks’s M9000 series of sets, support
both voltage and CLASS (FSK) Message Waiting. However, once the
CLASS set is configured in LD 10, then the Meridian 1 will no longer send
voltage messages to the set.
If a CLASS set that previously used FSK messaging to receive Visual
Message Waiting Indication has the Class of Service changed to be a non-
CLASS set that uses Voltage Message Waiting, the visual indicator will not
operate correctly. The following will occur:
• Voltage Message Waiting will work if the set is returned to the no
message waiting state (visual indicator is dark) before switching over
from FSK to voltage.
• Voltage message waiting will not work if the set is left at the message
waiting state (visual indicator is lit) before switching from FSK to
voltage.
It is up to the craftsperson to ensure that a CLASS set is correctly configured
to support the CLASS VMWI feature.
Up to 255 CMOD units may be configured on a Meridian 1 system. Once
configured, the CMOD units are shared throughout a multi-customer
Meridian 1 system. When an FSK message is transmitted to a CLASS set, an
available CMOD unit is automatically allocated.
If a CLASS set with a lit message waiting indicator retrieves all of its
messages, the CLASS VMWI feature will not be able to turn off the message
waiting indicator until the CLASS set has returned to the idle state.