Figure 9-1 is a block diagram showing the VP 300, the Centrex, and the connections between the two. For
integration via SMDI, a 1200 baud serial data link provides information to the VP 300 regarding calls that
have been forwarded to the VP 300 ports. In addition, the VP 300 can activate and deactivate Message
Waiting Indication via this link. The data link connects to a customer-provided modem at the customer's
premise.
The following describes Centrex SMDI MWI and CPI operation.
Message Waiting
SMDI tells the Centrex to provide a message waiting indicator in the form of a
Indication
stutter tone that can be activated by the VP 300 (for mailboxes with a COS
containing Attribute 9).
When the first new message is received in a mailbox, the VP 300 sends
information to the CO to activate the MWI. If MWI is activated, whenever that
station is used to originate a call, stutter dial tone is heard for approximately two
seconds after which regular dial tone is heard. The stutter dial tone indicates that
the mailbox associated with the station has new messages. Stutter dial tone is given
each time an attempt to originate a call occurs until the mailbox is accessed. When
the mailbox is accessed, the VP 300 sends information back to the CO to turn OFF
the MWI, even if the messages are not listened to and erased.
Toshiba VP Systems Release 6.1 February, 1993
9-2
Installation and Maintenance Manual
CENTRAL
OFFICE
VP 300
Customer
Stations
Figure 9-1 The VP 300, SMDI, and Centrex Connection
•
•
•
1AESS
CO switch
Multi-line
Hunt
Group
DS = Data Set
(provided by CO)
RS-232
CO Premise
CO Equipment
Customer Premise
Equipment
Dedicated 1200 baud
I/O Channel
modem
DS
modem
DS
Demarcation
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