Mocomtech CIM-550 Manuel D’Utilisation

CiM-550 IP Enabled Satellite Modem 

Rev. 2 

Introduction 

CD/CIM550.IOM 

5 

Optionally, the CiM-550 supports IP datagram compression to provide improved 
bandwidth.  IP payload is compressed while the IP Headers remain unaffected. 

Optionally, the CiM-550 supports IP header compression to provide improved bandwidth 
usage especially for smaller datagrams where the header overhead could be significant 
(e.g. VoIP). 

Quality of Service (QoS) is an optional feature of the CiM-550.  A QoS can be assigned 
to each route.  It dictates the guaranteed minimum and allowable maximum data rate for 
that route.  The CiM-550 classifies the incoming traffic based on the destination address 
and allocates bandwidth based on the configured profile. 

Optional NAT is a feature that allows a LAN to use private IP addresses for internal 
communications and share a totally different IP address for external communications. 



The CiM-550 optionally supports EasyConnect

 to support non-IP traffic.  This allows 

the CiM-550 to simultaneously route IP traffic and bridge non-IP traffic, such as IPX.  
The non-IP traffic will be subject to user configured QoS restrictions. 

IGMP is an optional feature in the CiM-550.  If enabled, it responds to IGMP queries for 
the configured multicast routes on the transmit side and generates IGMP queries on the 
receive side.  If there are no active IGMP receivers on the LAN it will stop forwarding 
the multicast traffic (received from the satellite) to the LAN. 

The CiM-550 supports 1:1 redundancy in conjunction with the CRS-100 IF Switch.  In a 
redundant configuration the primary CiM-550 communicates with the backup CiM-550 
for synchronization and status checks.  If there is a failure of the  primary unit, the 
backup CiM-550 assumes the role of the primary modem with minimal disruption to the 
traffic.  The switchover is transparent to other devices on the LAN.