Alcatel-Lucent 9500 MXC, User Manual, Page: 150 / 916

Chapter 3. 9500 MXC Nodes
Vol. II-3-56 Alcatel-Lucent
DAC GE Modes of Operation
DAC GE supports three operational modes, transparent, mixed or VLAN, which
determine the port-to-port and port-to-channel relationships within the L2 switch.
RWPR-enhanced RSTP may be enabled with transparent, mixed or VLAN
modes, though for most applications transparent is selected.
Transparent Mode
Transparent Mode supports options for layer 2 (L2) link aggregation, where
traffic on transport channels, or on channels and ports is aggregated onto a
common user interface with a capacity that is the sum of the individual link
capacities.
For information on layer 2 and layer 1 link aggregation refer to Link Aggregation
on page 3-62.
•
Transparent Mode with Aggregation Disabled
This
is the default, broadcast mode. With link aggregation disabled all ports
and channels are interconnected. It supports four customer LAN connections
(ports 1 to 4) with bridging to two separate transport channels (C1 or C2).
Figure 3-36.
Transparent Mode with Aggregation Disabled
To avoid a traffic loop only C1 or C2 is used over the same radio path. C1 and
C2 may be used where the DAC GE supports two back-to-back ring links
where one channel is assigned to the east, the other to the west.
• Transparent with Aggregation
Options are provided to select channel and/or port aggregation.
A channel selection applies where C1 and C2 to are each to be mapped to a
RAC or DAC 155oM in the same INU as the DAC GE. A typical application is
the co-channel XPIC assignment of two 150 Mbps links to provide a 300 Mbps
aggregate capacity over one 28 MHz or 30 MHz radio channel.
A channel plus port selection applies where the link or links to be aggregated
are installed on separate, co-located INUs.
• Two INUs, each with a DAC GE and a RAC 3X are used to provide a 600
Mbps aggregate capacity.
• Three INUs are used to provide a 900 Mbps aggregate capacity.