User`s guide

About the DL3100 2-3
2
How the DL3100 Works
The DL3100 allows you to conÞgure the data rate of each payload signal.
For example, you can select a data rate of 21 Mbps for a particular DTE
data interface module. The data rate and routing information is sent to the
T3 main board where a database of all associated connections is
maintained.
The T3 main board uses this information to direct the appropriate segment
of T3 bandwidth to the appropriate data interface module. It also controls
incoming data ßow from the data interface modules and controls access to
the data bus.
How Signal Flows from T3 Interface to the DTE Board
The T3 receive signal is Þrst terminated at the T3 main board BNC
connector. Once recovered, the payload data is written into a buffer where
demultiplexing occurs.
The DTE payload data is written from the backplane into buffers on the
receiving module. There it is processed into the appropriate format and
data rate. The resulting signal is routed back to the data interface connector
where it exits the system.
How Signal Flows from Data Interface to T3 Interface
The signal ßow described below uses a HSSI interface to HSDB as an
example, but it is the same for all the DTE boards supported.
The data signal Þrst terminates on the HSDB interface connector. The
signal is then routed to the HSDB, where the signal is recovered for further
processing. Once recovered the data is written to and stored in a buffer
until it is accessed by the T3 main board.
The T3 main board accesses the HSDB module by asserting the HSDB
address onto the address bus and initiating a read command. Once
accessed, the HSSI data is read onto the data bus and written into a buffer
on the T3 main board. The T3 main board then multiplexes the HSSI data
with other data inputs, if any, to be transported by the DL3100. The
composite signal is then processed for T3 transmission and sent to the
T3MB network connector where it exits the system.