Excalibur 366 Specifiche Pagina 198

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Excalibur Multirate DAP Installation and Operation
7-6
DDS Loop Test
The DDS Loop Test isolates the local DTE from the rest of the network. The DAP loops
its transmitter output to its receiver input at the DTE interface, and its receive DDS data
input to its transmit DDS data. (See Figure 7-6.)
Notes: The DDS Loop Test is not a full bandwidth test.
The units must be frame locked (aligned) to activate this loop in DDSNI and C64NI
modes. If the units are not frame locked, the screen displays the message Error
Communication Failure.
TX
DATA
RX
DATA
TRANSMITTER
RECEIVER
LINES
LOCAL DAP
INTER-
FACE
Figure 7-6. DDS Loop Test
Digital Loop Test
The Digital Loop Test isolates the local DTE from the rest of the network. You can run
this test on the entire aggregate bandwidth (Aggregate Digital Loop Test), through an
individual port (Port Digital Loop Test), or through a channel's lowest numbered port
(Channel Digital Loop Test).
During this test, the DAP establishes two loops. It loops its receiver output to its
transmitter input, and its transmit data input from the DTE to its receive data output to the
DTE. (See Figure 7-7.)
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