Dell PowerConnect 5548 User Guide - Page 17
Virtual Cable Testing (VCT), Auto-Negotiation, MDI/MDIX Support, MAC Address Supported Features - switch
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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 248. Auto-Negotiation 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 397 or "LAG Configuration" on page 403. MDI/MDIX Support Standard wiring for end stations is known as Media-Dependent Interface (MDI), and standard wiring for hubs and switches is known as MediaDependent 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 397 or "LAG Configuration" on page 403. MAC Address Supported Features MAC Address Capacity Support The device supports up to 16K MAC addresses and it reserves specific MAC addresses for system use. Dell PowerConnect 55xx Systems User Guide 17