Virtual Cable Testing (Vct); Auto-Negotiation; Mdi/Mdix Support; Mac Address Supported Features - Dell PowerConnect 5548P System User's Manual

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Virtual Cable Testing (VCT)

VCT detects and reports copper link cabling faults, such as open cables and

cable shorts.

For more information, see "Diagnostics" on page 255.

Auto-negotiation enables the device to advertise modes of operation. The

auto-negotiation function enables an exchange of information between two

devices that share a point-to-point link segment, and automatically

configures both devices to take maximum advantage of their transmission

capabilities.

The PowerConnect 5500 series enhances auto-negotiation by providing port

advertisement. Port advertisement enables the system administrator to

configure the port speeds that are advertised.

For more information, see "Port Configuration" on page 404 or "LAG

Configuration" on page 410.

Standard wiring for end stations is known as Media-Dependent Interface

(MDI), and standard wiring for hubs and switches is known as Media-

Dependent Interface with Crossover (MDIX).

If auto-negotiation is enabled, the device automatically detects whether the

cable connected to an RJ-45 port is MDIX (crossed) or MDI (straight). This

enables both types to be used interchangeably.

If auto-negotiation is not enabled, only MDI (straight) cables can be used.

For more information, see "Port Configuration" on page 404 or "LAG

Configuration" on page 410.

MAC Address Capacity Support

The device supports up to 16K MAC addresses and it reserves specific MAC

addresses for system use.

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Dell PowerConnect 55xx Systems User Guide