Specifications
Table Of Contents
- AR400 Series Router Hardware Reference
- Contents
- Introduction
- Models Covered By This Reference
- Where To Find More Information
- AR410 and AR410S Routers
- AR440S and AR441S ADSL Routers
- AR450S Router
- Rack and Wall Mounting
- Online Documentation
- AT-TFTP Server
- Using Windows HyperTerminal
- Router Start-Up
- Flash Memory
- RS-232 Terminal Ports (ASYN)
- Cables and Loopback Plugs
- Test Facility
- Expansion Options
- Restricted Procedures
- Contacting Us
40 AR400 Series Router
C613-03086-00 REV A
Dual mode
Throughput of an encrypted link can be dramatically increased by using data
compression. To support this, ECMACs support both encryption and
compression to provide a dual mode that allows combined compression and
encryption operations. So that the compression phase will have the best
opportunity at finding non-random data, compression occurs before
encryption, in the order:
compression → encryption →//→ decryption → decompression
Adding compression to an encrypted link increases line throughput. Once
compression has been carried out there is less data requiring encryption,
passing back to the base system, and transferring across the network, so less
base system bus and network link bandwidth is required for a given amount of
data. This results in the dual operation being very effective where encryption is
required.