Panasonic KX-TVS125, Руководство по установке

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3.1 GUIDELINES FOR INTEGRATION
Installation Manual 65
The VPS must also have access to certain PBX features. For example, if the VPS takes a
message, one way it can notify the mailbox owner is by dialing the PBX’s Message-Waiting-
Lamp-On code. Once new messages are retrieved, the VPS dials the Message-Waiting-
Lamp-Off code for that same mailbox owner.
3.1.4 PBX Requirements for Integration
The PBX must have certain capabilities and features to work with the VPS. (Although this
section includes tests to help you evaluate the PBX, it may be necessary to refer to the PBX’s
documentation for detailed capability and feature descriptions.)
Single Line (Tip/Ring) Port Circuits
The VPS can only be connected to a PBX that supports SLT sets. Some PBXs need an OPX
card to provide this connection.
However, some OPX cards do not provide all the
capabilities listed in this section.
Following are the minimum current and voltages that the PBX must supply:
Station to Station Touchtone Signaling
For system users to access VPS services and features, they must be able to send touchtones
from their telephones to the VPS port. As a general rule, SLT sets can perform station-to-
station touchtone signaling; however, many proprietary telephones cannot. Some PBXs need
to be programmed to make proprietary sets use touchtone signaling.
If the PBX does not provide station-to-station touchtone signaling, VPS services and
features will be limited.
Table 3-1 VPS/PBX COMMUNICATION
PBX to VPS VPS to PBX
Call Progress Tones
• ringback
• busy
• reorder
Touchtones
SLT Signals
• on/off hook
• hookswitch flash
• touchtones
Table 3-2
Minimum Loop Current 20 mA
Minimum Line Voltage 7 V DC
Minimum Ringing Voltage 40 V AC
TEST: Call an SLT extension from the telephone in question. When the call
is answered, see if the person receiving the call hears touchtones when
numbers are dialed.