Specifications
Chapter 1 Introduction Installation and Operation Manual
1-2 Applications HS-RN MP-2100/2104 Ver. 12.6, MP-4100 Ver. 2.0
• The local DTR state determines the remote DSR state, and vice versa
• The local RTS state determines the remote DCD state, and vice versa.
Basically, each HS-RN channel is assigned an individual timeslot in the E1, T1 or
SDH/SONET uplink. The HS-RN modules also support split timeslot assignment,
therefore improving uplink bandwidth utilization.
The user can assign the timeslots and timeslot bits to HS-RN channels manually.
User-controlled manual timeslot assignment allows routing the bit stream
generated by each local channel to any other compatible Megaplex channel at the
remote site.
In addition to the normal full-duplex (bidirectional) mode, HS-RN supports
additional transmission modes, which enable point-to-multipoint communication:
• Unidirectional (simplex) transmission, where each channel can be configured
either to receive (unidirectional RX) or transmit (unidirectional TX).
• Bidirectional broadcast (half-duplex) communication, suitable for polled
applications. In this mode, a channel can either transmit or receive, but not
both simultaneously (the direction of transmission is determined by the state
of the local RTS line). This mode is not supported by the Megaplex-4100
chassis.
For a description of these modes, see the corresponding
Megaplex Installation
and Operation Manual
.
The operation mode of each channel is independently selectable, using the
Megaplex management system or a supervision terminal.
The HS-RN modules perform rate adaptation using a proprietary HDLC-based
protocol, while the HS-RN/V.110 modules perform rate adaptation in accordance
with ITU-T Rec. V.110. Multiplexing in both models is performed in accordance
with ITU-T Rec. I.460.
1.2 Applications
Low-Speed Data Connectivity
Figure
1-1
shows a typical point-to-point low-speed data transmission application
using HS-RN modules.
In this application, two HS-RN modules are used to connect remote terminals to a
server or communication controller through the Megaplex link. Each channel can
be connected to a different destination.
The HS-RN modules enable efficient utilization of link bandwidth; for example, a
HS-RN module enables the transmission of all the four 9.6 kbps channels in one
64 kbps timeslot (see
Section
1.4
for additional details).