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CM-TB8T Telephone Hybrid Expansion Card 12
CM-TB8T Introduction
The CM-TB8T is a dual PSTN, telephone hybrid expansion card. It extends
the talkback capability of the unit by allowing telephone calls to be made
and received on two independent analogue direct exchange or PSTN lines.
Outgoing calls can be dialled directly from the unit, or from an external
telephone handset connected to each of the two telephone channels. Once
calls have been connected, the user can talk to each channel individually or
conference 2 calls together.
The hybrids are fully configurable and are easy to setup. Simply select your
location from a country code list to automatically configure the telephone
interface for local line conditions. This setting also configures the relevant
auto disconnect mode which can be enabled if required.
Enabling the Telephone Interface
Before the telephone expansion card can be used, it needs to be enabled.
The two telephone lines are assigned to channels 1 and 2 on the CM-TB8
and they can be independently enabled using the embedded web server.
See the section on how to connect to the web server.
Once connected to the web server on the relevant CM-TB8, select the
Channel Settings page under the Configuration tab. Channels 1 and 2 will
have a new “Enable – PSTN Telephone Expansion Fitted” option available as
shown in Fig 12-1.
Fig 12-1: Channel Settings Page
Selecting this option will enable the telephone hybrid for the selected
channel. The required channel must be connected to an analogue direct
exchange line or PSTN line via the rear panel mounted RJ11 connector. An
optional telephone handset can also be connected to the RJ11 handset
connector. The telephone interface is not accessible unless a valid
telephone line connection is made.
Once the telephone interface has been enabled, the relevant country code
setting should be selected in the PSTN Settings page. This ensures that all
telephone approval parameters are met for operation of this unit in various
parts of the world.
