Specifications

Introduction MP-2100 HS-R Installation and Operation Manual
1-6 Functional Description
• At 56 kbps, an 8-bit frame is used. This frame uses seven frame bits for
transparent transfer of the user's 56 kbps data stream, and the eighth bit is
always “1”.
• At 64 kbps, no framing is used (transparent transfer of user's data stream).
Interface Control Lines
The RS-232 interface control signals are locally supported in accordance with the
RS-232 protocol, with the following modifications:
• The DSR line is continuously active (ON), except when the end-to-end
transmission of control signals is enabled.
• The DCD line is ON when the local Megaplex unit is synchronized, and is OFF
when the unit loses synchronization.
• For flexibility in application, the user can program the state of the CTS line.
The available selections are:
 The CTS line is continuously active (ON).
 The state of the local CTS line tracks the state of the local RTS line.
• The user can enable end-to-end transmission of the states of the local DTR and
RTS lines to the remote DSR and DCD lines, respectively.
Note that control signals are not supported at the 56 or 64 kbps channel rates.
Channel Connectors
The data channels of the HS-R module are terminated in two 25-pin D-type
female connectors: one carries Channels 1 and 2, and the other carries Channels 3
and 4.
As an option, RAD offers two types of channel splitter cables, which enable direct
connection of data equipment with RS-232 interfaces to an HS-R 25-pin
connector:
• CBL-HSR/F, which terminates into two 25-pin D-type female connectors.
• CBL-HSR/M, which terminates into two 25-pin D-type male connectors.
Timing
When operating in the synchronous mode, the timing of the HS-R channel
interfaces is locked to the Megaplex nodal timing.
The timing mode of each HS-R module channel can be selected by the user.
Two options are available:
• DCE: the interface provides transmit and receive clock signals to the user's data
equipment (DTE). The user's DTE must receive and transmit at the rate of the
clock signals provided by the HS-R channel interface.