Table 2-7. RJ-45 Pin Number Allocation for 10/100/ 1000BASE-T Ethernet Port

Pin No Function

6TxRx 3-

7TxRx 4+

8TxRx 4-

SFP Ports

The PowerConnect 2824 switch supports two SFP transceivers combo ports, and the PowerConnect 2848 switch supports four SFP transceivers combo ports for various fiber-based modules (1000BASE-SX or 1000BASE-LX). Only one of the two physical connections of a combo port can be used at any time. The system can switch from the RJ-45 to the SFP (or vice versa) without a system reset. The system automatically detects the media used on a combo port, and utilizes this information in the control interfaces.

PowerConnect 2824 switch supports SFP diagnostics. The optical transceiver provides access to a set of parameters that can be monitored and displayed to the system administrator.

NOTE: If both RJ-45 and SFP ports are present, the SFP port will be the active port, whereas the RJ-45 port will be disabled and ignored.

The pin number allocation for the SFP ports is listed in the following table.

Table 2-8. SFP Pin Connections

Pin No Use

1Transmitter ground (common with receiver ground)

2Transmitter fault

3Transmitter disable; laser output disabled on high or open.

4Module definition 2; data line for serial ID.

5Module definition 1; clock line for serial ID.

6Module definition 0; grounded within the module.

7Rate select; no connection required.

8Loss of signal indication; logic 0 indicates normal operation.

9Receiver ground (common with transmitter ground)

10Receiver ground (common with transmitter ground)

11Receiver ground (common with transmitter ground)

12Receiver inverted data out; AC coupled.

13Receiver non-inverted data out; AC coupled.

14Receiver ground (common with transmitter ground)

Dell PowerConnect 28xx Systems User Guide

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Dell 28XX manual SFP Ports, SFP Pin Connections Pin No Use