Specifications

Installation and Operation Manual Chapter 1 Introduction

HS-RN MP-2100/2104 Ver. 12.6, MP-4100 Ver. 2.0 Functional Description 1-9

TDM Bus Interfaces (Megaplex-2100/2104 only)

The HS-RN module has four independent TDM bus interfaces, one for each

Megaplex-2100/2104 TDM bus. Each TDM bus interface is used to connect

timeslots from the corresponding bus to the internal routing matrix of the HS-RN

module, in accordance with the commands received from the CL module.

HS-RN can use all the four TDM buses. However, when necessary the

Megaplex-2100/2104 user can configure it to use only two TDM bus interfaces,

irrespective of the number of TDM buses used in the Megaplex-2100/2104

chassis.

The default number of TDM buses used in the MP-2100/2104 chassis is 4. The

number can be reduced by means of the SET USER command. The HS-RN module

can be configured to use all the four TDM buses only when the number of

MP-2100/2104 TDM buses has not been reduced.

Routing Matrix

The HS-RN module includes a routing matrix that controls the routing of the

module channels to the desired Megaplex main link ports, via the TDM buses.

The matrix also supports split timeslot routing: it enables inserting any channel

not requiring a full timeslot in any position of a desired timeslot (see number of

required bits versus channel data rate in

Table

1-2

Matrix routing is controlled by the CL module, and enables connecting any TDM

bus timeslot to any channel. The routing matrix also supports unidirectional

routing of timeslots, and broadcasting from one timeslot to multiple destinations

(refer to the corresponding

Megaplex Installation and Operation Manual

for

details).

Encapsulation Mode

In the HDLC module version, the module encapsulation mode can be optimized

according to the user application as follows:

• Bandwidth Optimized – enables uplink bandwidth optimization (using split

timeslots) in applications less sensitive to latency.

• Latency Optimized – enables minimum end-to-end data latency. In this mode

split timeslots are not available, and the uplink bandwidth should be always

transferred over full 64 kbps timeslot per channel.

In the V.110 module version, the module operates in Bandwidth Optimized mode

only, but the end-to-end data latency is at minimum.

A pair of HS-RN modules can operate together only if set to the same mode

(HDLC/BO, HDLC/LO or V110).

Note