Lucent Technologies P550 - Manual (Page 24)

Cajun P550 Switch Overview
1-4 Cajun P550/P220 Switch Operation Guide
Figure 1-2 illustrates a conceptual diagram of the Layer 3 supervisor module’s functions.
Figure 1-2. Layer 3 Supervisor Module Conceptual Operation
Media Modules
All Layer 2 and Layer 3 media modules have full non-blocking performance.
Bridging and routing are performed on the input side of each media module.
Each media module features:
❒ IEEE 802.3z full-duplex flow control - This allows the switch ports to send a
pause command before input buffers overflow. Half-duplex ports support active
backpressure (jamming).
❒ VLAN trunking or non-tagged access modes - This allows the switch ports to
interoperate with popular tagged trunking schemes used by large networking
vendors.
❒ Priority Queuing and Class of Service - These features allow you to prioritize
traffic between particular stations or sets of stations to support jitter-sensitive
applications. Supported class of service types: 3Com PACE CoS, IEEE 802.1p CoS.
Layer 3 and Layer 2 Fast Ethernet Modules
The Layer 2 (L2) and Layer 3 (L3) Fast Ethernet modules include:
❒ 20-Port 10/100Base-TX Ethernet Module (L2 support), with 20 RJ-45 Ports -
10/100, HDX/FDX
❒ 10-Port 100Base-FX Ethernet Module (L2 support), with 10 Fast Ethernet Ports -
Fiber, 1300 nM, HDX/FDX
Multilayer Supervisor Conceptual Diagram
High-
Speed
Access
To /
From
Switch
Fabric
Wirespeed Routing
in Hardware
Software-based
Routing
System
management
Routing Table and
Cache Management
Manage-
ment
Inter-
faces
High-speed
CPU