Modes Of Operation - Harris Stratex Eclipse 4.6 User Manual

Inter-frame gap (IFG) and preamble stripping and re-insertion is used across the link
to maximize Ethernet throughputs. Its benefit is most noticeable with small frame sizes
where the IFG and preamble represents a more significant part of the total frame space.
Requires SW release 4.3 or later. Auto negotiation is used between the DAC ES modules
at each end of the IDU ES link to determine SW level compatibility. If one end uses a
pre 4.3 SW release, IFG and preamble stripping is not used across the link.
The four 10/100Base-T Fast Ethernet ports may be connected to the transport channels
in transparent, VLAN or mixed operational modes. Channel capacity is incremented in
2 Mbps (2.048 Mbps) or 1.5 Mbps (1.544 Mbps) steps.
Refer to:
• Modes of Operation on page 2-17
• Transport Channel Configuration on page 2-18
• Basic Port Settings on page 2-18
• Priority Mapping on page 2-19
• Flow Control on page 2-19
• Disable Address Learning on page 2-19
• Maximum Frame Size on page 2-20
• Latency on page 2-20
• Ethernet Diagnostics on page 2-20

Modes of Operation

IDU ES is configured using Portal, the Eclipse craft tool. User-friendly screens prompt
for channel size (Ethernet bandwidth), modes of operation, QoS settings, and interface
options.
Three modes of operation are supported, which define the connection fabric between
ports and channels. These modes are Transparent, VLAN or Mixed:
Transparent Mode
This is the default, broadcast mode; all ports and channels are interconnected. It
supports four customer connections (ports 1 to 4) with bridging to and between the two
transport channels (C1, C2).
Figure 2-7.
VLAN Mode
VLAN or transport mode supports four separate LAN connections. Port 1 is dedicated
to channel 1, and ports 2 to 4 are multiplexed to channel 2 to provide three virtual LANs
(VLANs 2, 3 and 4). Internal VLAN port tagging of packets provides correct end-to-end
matching of port traffic over the channel 2 link. Tags are removed before port egress at
the far end.
260-668066-001 Rev 024 February 2009
Transparent Mode Port and Channel Assignment
Eclipse User Manual
Vol. II-2-17