Dell PowerConnect 2848 User's Guide - Page 25

Table 2-7. RJ-45 Pin Number Allocation for 10/100/ 1000BASE-T Ethernet Port Pin No 6 7 8 Function TxRx 3TxRx 4+ TxRx 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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Use Transmitter ground (common with receiver ground) Transmitter fault Transmitter disable; laser output disabled on high or open. Module definition 2; data line for serial ID. Module definition 1; clock line for serial ID. Module definition 0; grounded within the module. Rate select; no connection required. Loss of signal indication; logic 0 indicates normal operation. Receiver ground (common with transmitter ground) Receiver ground (common with transmitter ground) Receiver ground (common with transmitter ground) Receiver inverted data out; AC coupled. Receiver non-inverted data out; AC coupled. Receiver ground (common with transmitter ground) Dell PowerConnect 28xx Systems User Guide 25