Specifications

Excalibur Multirate DAP Installation and Operation
2-8
2. When the answering DAP detects a ringing signal on the dial line, it answers the
call.
3. A handshake takes place between the originating and answering units to verify
the connection.
4. If the handshake is successful, the DAPs are connected to the dial line.
Front Panel Status Information
The following status information is displayed on the front panel while the dial-up
connection is being established (through any of the methods):
• A line is taken off-hook.
• Call progress information such as no dial tone on the line, busy signal, etc.
• Whether the dial line is connected or disconnected.
Call Establishment
When the dial backup connection is initiated and automatic dial is enabled on the
originating DAP, the answering DAP's primary telephone number is dialed. When
automatic dial is disabled, you may manually dial the answering DAP's primary or any of
its four alternate telephone numbers.
Call Answering
When automatic call answering is enabled, the DAP answers incoming dial line calls in
response to one of the following user-selectable conditions:
• Always - the DAP always answers calls.
• DDS Line or Local Loop Down - the DAP only answers calls when the DDS
line goes down (due to Out of Service codes, Abnormal Station codes, loss of
multiport framing, or loss of network framing) or when an invalid DDS signal is
received from the network.
• No Signal - the DAP only answers calls when an invalid DDS signal is received
from the network.