Comtech EF Data CDM-570 - Manual (Page 439)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Appendix G MN/CDM570L.IOM
G–3
Working Mode
HDLC Address Mode
Network Topology Ethernet Traffic
Large Network All sites on different LAN subnet
Router + Brouter Point-to-Point – Large Network IP v4 + VLAN
Feature Support
– The IP Module has several standard and optional features to further optimize
security, performance and efficiency. These features are supported in the two working modes as
follows:
Feature Managed Switch Mode Router Mode
HDLC Address Mode Point-to-Point Only
Point-to-Point, Small Network, Large
Network (can be Point-to-MultiPoint)
10/100 BaseT Operation
10 or 100BaseT
Half or Full Duplex
10 or 100 BaseT
Half or Full Duplex
Access Lists None 4 Clients by IP or IP Subnet
3xDES Encryption
1 Encrypt Decrypt
All traffic encrypted when enabled
Up to 8 Encrypt Decrypt Keys or random
Traffic encrypted on a per route basis
Quality of Service Min/Max; Max/Priority; DiffServ Min/Max; Max/Priority; DiffServ
Header Compression
Yes – Layer 2 is always compression.
Applied to all Layers 3, 4, and 5 traffic
when enabled
Yes – applied on a per route basis
Payload Compression
Yes - applied to all traffic when
enabled
Yes – applied on a per route basis
Multicast
Select either all or no Multicast, Uplink
or Downlink
All or specific Multicast streams, Uplink or
Downlink
IGMP No Yes
Remote upgrade by FTP Yes Yes
G.3.2 Working Modes – Streamline Encapsulation
Streamline Encapsulation is available only in Ethernet IP Module V1/MPP-50
FW Ver. 1.7.# and later, and Ethernet IP Module V2/MPP-70 FW Ver. 2.2.# and
later.
The Comtech Streamline Encapsulation method was developed to provide a low overhead method
of transporting any size packetized data. It provides superior performance on small packets and
performs well on large packets, with overhead performance approaching 1%. With respect to
HDLC, Comtech Streamline Encapsulation outperforms the longtime industry standard on all
packet sizes.