SAGEM-LINK F 288055571-04
Installation and Operation Manual
Page 119/142
Issue 04 : July 2005
Reproduction and communication prohibited without the written permission of Sagem Communication
Ethernet Bandwidth Selection for 16QAM Modulation
Click the box which corresponds to the wanted configuration. If the wanted configuration is not listed,
close the screen, change modulation scheme by clicking on the modulation button and return to this
screen.
Tributary configuration alarm and tributary loopback operations are the same as for nxE1 IDUs (refer
to Chapter 2, section 2.5 and to Chapter 3 section 3.2.4 of this manual).
Once again, the extra tributary available for the highest data rate is labeled "Trib 9" in the Pilot
tributary screen.
6.3 - Ethernet Features Description
Two basic built-in applications are available : bridging and bandwidth allocation. The Ethernet
interface allows to connect SAGEM LINK F to standard IEE 802.3 Ethernet devices.
6.3.1 - Ethernet Bridging
When bridging is selected, the system learns automatically the MAC addresses of subscribers and
forwards only those packets destined for the service side. Up to 10000 MAC addresses are supported.
The system is designed to provide ANSI/IEEE 802.1D Media Access Control bridging capabilities
(without the spanning tree algorithm)
When the MAC Address filtering is selected, the system remove from the list the devices which
become inactive for a certain period of time (300 s).
Packets forwarded in either direction, are temporarily stored in buffers. When the speeds of the
Subscriber and Service Networks are the same, the queue length is very short. However, when the
speeds are different, the queue length on the slow side increases.
Up to 1024 frames can be buffered to prevent packet loss when there is a speed difference between
the two sides.
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