VSC7440 datasheet(25/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

All Ethernet ports support Energy Efficient Ethernet (EEE) according to IEEE 802.3az. The shared queue

system is capable of controlling the PCS operating states, which are active or low power. The PCS

understands the line signaling as required for EEE. This includes signaling of active, sleep, quiet, refresh,

and wake.

3.2.1.1

1G Copper PHY Ports

1G copper PHY ports operate in 1000BASE-T. Auto-negotiation is supported for pause settings and

remote fault signaling. Full-duplex is supported for 10/100/1000 Mbps, while half-duplex is supported for

10/100 Mbps.

3.2.1.2

1G SGMII Line Ports

1G SGMII line ports operate in one of the following modes:

•

10/100/1000 Mbps SGMII. The SGMII interface connects to an external copper PHY device or

copper SFP optical module with SGMII interface. In this mode, auto-negotiation is supported for link

speed, duplex settings, pause settings, and remote fault signaling. Full-duplex is supported for all

speeds, while half-duplex is supported for 10/100 Mbps.

•

100BASE-FX. The 100BASE-FX interface connects directly to a 100BASE-FX SFP optical module.

Auto-negotiation is not specified for 100BASE-FX and is not supported. Operation is always

100 Mbps and full duplex.

•

1000BASE-X. The 1000BASE-X interface connects directly to a 1000BASE-X SFP optical module.

Auto-negotiation is supported for pause settings and remote fault signaling. Operation is always

1000 Mbps and full duplex. 1G backplane Ethernet 1000BASE-KX is fully supported, including

auto-negotiation.

3.2.1.3

2.5G SGMII Line Ports

The 2.5G interface connects directly to an SFP optical module. Operation is always 2500 Mbps and full

duplex. 2.5G backplane Ethernet is also supported.

The 2.5G SGMII line port can also operate in the modes supported by the 1G SGMII line port.

3.2.1.4

10G SFI Line Ports

The 10G interface connects directly to a 10GBASE-R SFP+ optical module or an external PHY device.

Auto-negotiation is supported for pause settings, remote fault signaling, and backplane Ethernet

functions. The 10G or 1G operation is supported for SFP+ optical modules, and operation is always full

duplex.

When used with external devices capable of WAN-PHY (10GBASE-W) operation, the 10G line ports

support pacing operation as specified for 10GBASE-W operation.

The 10G SFI line port can also operate in the modes supported by the 2.5G and 1G SGMII line ports.

3.2.2

Basic Classification

Basic frame classification in the ingress processing module (the analyzer) receives all frames before

further classification processing is performed. The basic classifier uses configurable logic to classify each

frame to a VLAN, QoS class, drop precedence (DP) level, DSCP value, and an aggregation code. This

information is carried through the switch together with the frame and affects policing, drop precedence

marking, statistics collecting, security enforcement, Layer 2 and Layer 3 forwarding, and rewriting.

The basic classifier also performs a general frame acceptance check. The output from the basic

classification can be overwritten or changed by the more intelligent advanced classification using the

TCAM-based VCAP.

3.2.3

Security and Control Protocol Classification

Before being passed on to the Layer 2 forwarding, all frames are inspected by the VCAP IS2 for security

enforcement and control protocol actions.

The action associated with each IS2 entry (programmed into the IS2 action RAM) includes frame filtering,

single leaky bucket rate limiting (frame or byte based), snooping to CPU, redirecting to CPU, mirroring,

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