MDS1903URH

Description

The MDS105 is a fully integrated 5 port Ethernet switch designed to support the low-cost requirements of unmanaged switch applications. The MDS105 provides features that are normally not associated with plug-andplay technology, while not requiring an external processor to facilitate their utilization.

Features

• 4 10/100 Mbps auto-negotiating RMII ports
• 1 10/100 Mbps auto-negotiating MII/serial port (Port 4) that can be used as a WAN uplink or as a 5th port
• External I2C EEPROM for power-up configuration
- Default mode allows operation without external EEPROM
• Up to 4 port-based VLANs
• Full wire-speed layer 2 switching on all ports (up to 1.448 M packets per second)
• Internal 1 k MAC address table
- Auto address learning
- Auto address aging
• Leading edge QoS capabilities provided based on 802.1p and IP TOS/DS field
- 2 queues per output port
- Packet scheduling based on Weighted RoundRobin (WRR) and Weighted Random Early Detection/Drop (WRED)
- Without flow control can drop packets during congestion using WRED
- 2 levels of packet drop provided
• Supports both Full/Half duplex ports
• Supports external parallel port for configuration updates
• Port 3 can be used to mirror traffic from the other 3 ports (0-2)
• Provides port-based prioritization of packets on up to 2 ports (0-1)
- Input ports are defined to be high or low priority
- Allows explicit identification of IP Phone ports
• Ports 0 & 1 can be trunked to provide a 200 Mbps link to another switch or server
• Utilizes a single low-cost external Pipelined, SyncBurst SRAM (SBRAM) for buffer memory
- 256 k bytes or 512 k bytes (1 chip)
• Flow Control capabilities
- Provides back pressure for half duplex
- 802.3x flow control for full duplex
• Special power-saving mode for inactive ports
• Ability to support WinSock2.0 and Windows2000 smart applications
• Transmit delay control capabilities
- Provides maximum delay guarantee (<1 ms)
- Supports mixed voice-data networks
• Optimized pin-out for easy board layout