CiM-550 IP Enabled Satellite Modem

Rev. 2

Introduction

CD/CIM550.IOM

1.2 MAJOR ASSEMBLIES

Assembly

Description

PL/0391

Modem Card

 

 

PL/9161-1

IP Module

 

 

1.3STANDARD FEATURES

10baseT/100baseT Ethernet Interface Static IP routing for unicast and multicast Powerful network management

Web Server interface for complete product management SNMP with private MIB

Telnet interface for remote product M & C

Console Port interface for local network management

Configurable serial interface (EIA-232 or RS485) for local management Remote software/firmware upgrade via FTP

Configuration backup and restore via FTP Local software/firmware via console port Data rates from 2.4 to 2048 kbps

Symmetric as well as asymmetric operation for maximum bandwidth efficiency Automatic Uplink Power Control (AUPC)

CDM-550 Emulation Mode

1.3.1 AUPC

An important innovation in the CiM-550 is the addition of Automatic Uplink Power Control (AUPC). This feature enables the modem to automatically adjust its output power to maintain the Eb/No of the remote end of the satellite link constant. This provides protection against rain fading, a particularly severe problem with Ku-band links.

To accomplish this, the framed mode of operation must be used, and the distant end modem constantly sends back information about the demodulator Eb/No using reserved bytes in the overhead structure. Using the Eb/No, the local modem then adjusts its output power, and hence, a closed-loop feedback system is created over the satellite link.

A benefit of this feature is that whenever framed operation is selected, the remote demodulator’s Eb/No can be viewed from the front panel display of the local modem.

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