Table of Contents
Advertisement
DUET
EMT Level
The Ethernet Multicast Transfer (EMT) is a proprietary protocol designed by ADTEC for high-speed
distribution of files. EMT resides at the physical layer of the Ethernet Protocol and operates by multicasting
files from a designated solicitor to all subscribers on the network. The solicitor will accomplish this by using
one of two modes. In half duplex mode the solicitor will continuously multicast all files in its directory
without requiring acknowledgments from subscribers. In full duplex mode the solicitor will broadcast a
solicitation every three seconds to see if any subscriber needs the file. If the solicitor receives any
subscriptions it will then begin multicasting the file. The subscribers will then be required to send periodic
acknowledgements until the file is finished multicasting.
******************WARNING******************
In order to distribute files in the least amount
of time EMT has been highly optimized and will
use
in
excess
bandwidth on a 10baseT network.
ADTEC equipment is connected to the rest of
your LAN or a WAN it is highly recommended
that a router/bridge be used to either block all
broadcast or EMT transmissions only. EMT
uses a proprietary packet type of ADEC (hex).
Please see your network administrator for
more details on how to set up a router/bridge.
In the absence of a router/bridge the amount of
bandwidth used by EMT can be constrained by
lowering the Upper Bit Rate of the EMT Setting
at the expense of slower file distribution.
3/22/00
ADTEC, Inc.
VERSION 4.0
of
90%
of
V4.0-14
KEYPAD
MPEG 2 DIGITAL INSERTER
the
available
If your
USA
Advertisement
Table of Contents
