Mocomtech CIM-550 - Manual (Page 28)

CiM-550 IP Enabled Satellite Modem Rev. 2
Introduction CD/CIM550.IOM
2
1.2 M
AJOR
A
SSEMBLIES
Assembly Description
PL/0391 Modem Card
PL/9161-1 IP Module
1.3 S
TANDARD
F
EATURES
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.