Specifications

DXP Correspondence Manual
Introducing The DXP
1.9
Identifying
The Line Boards
Line boards provide the interface for connecting the central office, or
CO, lines to the DXP. You can use a station board in Universal slots 1
through 5 in the main cabinet, universal slots 6 through 11 in the
expansion cabinet, and line slots 1 through 4 in the main cabinet (you
can only install a Tl board in the second line slot or the fifth universal
slot of the main cabinet, or in universal slot 8 or 12 in the expansion
cabinet). While line boards are optional, it’s rare that you will have an
application that won’t require CO lines. The DXP supports several
different types of line boards,
l Loop start,
l Multipurpose,
l Direct Inward Dialing, or DID,
l and Tl.
Make sure that the lines coming from the CO match the line boards
that you install in the DXP. Having a Tl board does not mean you
have Tl lines, for example. Be sure to coordinate with your CO before
you plan your line configurations. Special software may be required to
support certain line boards. Your class instructor will give you further
details on software requirements when you take the classroom portion
of the training.
Like the station boards, each line board has a pre-power jack that
allows a technician to service the board while the DXP still has AC
power.
The status light on each line board indicates when a line is in use: off
with a five-second blink rate on indicates that all lines are idle; on
with a five-second blink rate off indicates at least one busy line. A
rapid flash indicates a malfunctioning microprocessor on the line
board. All line boards provide secondary surge protection; Chapter
Three discusses secondary and primary surge protection.
Introducing The DXP 1 - 11