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9883 Datasheet(PDF) 17 Page - Intel Corporation |
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9883 Datasheet(HTML) 17 Page - Intel Corporation |
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17 / 56 page  Advanced 10/100 Unmanaged Repeater — LXT9883/9863 Datasheet 17 Document #: 249115 Revision #: 003 Rev. Date: 08/07/01 This multi-port repeater provides six (LXT9863) or eight (LXT9883) 10BASE-T/100BASE-TX ports. In addition, each device also provides two Media Independent Interface (MII) expansion ports that may be connected to 10/100 MACs. The LXT98x3 provides two repeater state machines and two Inter-Repeater Backplanes (IRB) on a single chip—one for 10 Mbps and one for 100 Mbps operation. The 100 Mbps repeater meets IEEE 802.3 Class II requirements. The auto-negotiation capability of the LXT98x3 allows it to communicate with connected nodes and configure itself accordingly. The segmented backplane simplifies dual-speed operation, and allows multiple devices to be stacked and function as one logical Class II repeater. Up to 240 ports (192 TP ports and 48 MII ports) can be supported in a single stack. 3.2 Port Configuration The LXT98x3 powers up in auto-negotiation mode for all twisted-pair ports. 3.2.1 Auto-Negotiation All TP ports on power-up are configured to establish link via auto-negotiation. The port and link partner establish link conditions by exchanging Fast Link Pulse (FLP) bursts. Each FLP burst contains 16 bits of data advertising the port’s capabilities. If the link partner does not support auto- negotiation, the LXT98x3 determines link state by listening for 100 Mbps IDLE symbols or 10 Mbps link pulses. If it detects either of these signals, it configures the port accordingly. Figure 3. Typical LXT9883 Repeater Architecture LXT9883 IC Device Management 10BASE-T Repeater 100BASE- X Repeater LED Drivers RMON & SNMP Counters 10 Mbps Backplane 100 Mbps Backplane 10/100 PHY 10/100 PHY MII MII 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY LXT9883 IC Device Management 10BASE-T Repeater 100BASE- X Repeater LED Drivers RMON & SNMP Counters 10 Mbps Backplane 100 Mbps Backplane 10/100 PHY 10/100 PHY MII MII 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY LXT9883 IC 10BASE-T Repeater 100BASE-X Repeater LED Drivers 10 Mbps Backplane 100 Mbps Backplane 10/100 PHY 10/100 PHY MII MII 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY Buffer 100M Backplane Buffer 10M Backplane MII to MII Bridge |
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