Supports seven 10/100 Mbit/s Ethernet ports with RMII 10/100 Mbit/s Et

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Supports seven 10/100 Mbit/s Ethernet ports with RMII 10/100 Mbit/s Et

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AL121 Advance Information Port 10/100 Mbit/s Dual Speed Fast Ethernet Switch
Supports seven 10/100 Mbit/s Ethernet ports with RMII 10/100 Mbit/s Ethernet port with MII/RMII interface Capable trunking Mbit/s link with link fail-over Full- half-duplex mode operation Supports address tables Scalable design stackable switch implementation RoX-II expansion link supports Gbit/s throughput Flexible prioritized queueing multimedia data traffic Gigabit Ethernet ready with AL1022 Layer switching with AL3000 RoX-II IEEE 802.3x flow control full-duplex operation Optional backpressure flow control support half-duplex operation IGMP frame trapping Supports multicast groups RMON SNMP support with AL300A management (MIB) device 0.25 micron, 2.5V 3.3V CMOS technology 2.5V 3.3V operation Packaged 272-pin
AL121 eight-port 10/100 Mbit/s dual speed Ethernet switch. low-cost scalable solution 32-ports achieved through low-cost buffer memory Allayer's proprietary RoX-II architecture. addition, AL121 also supports port-based VLAN multiple port aggregation trunks.
10/100
Switch Controller
Buffer Manager
10/100 Expansion Interface
10/100 High Speed Switch Fabric
Address Control
10/100
10/100
Address Table
10/100 EEPROM Interface 10/100 Management Information 10/100
Figure
System Block Diagram
Reference Only Allayer Confidential
AL121 Advance Information
AL121 Overview
AL121 eight-port 10/100 ethernet switch chip with RoX-II expansion interface. RoX-II interface Gbit/s interface (6.4 Gbit/s full-duplex). RoX-II support four switch chips management router chip. Various combinations used different configurations. maximum port configuration will 32-port Mbit/s ports 24port 10/100 Mbit/s plus Gigabit Ethernet ports, eight gigabit ports. Higher port count stacking configurations achieved with additional bridges crossbar devices. RoX-II interface supports external management device, AL300A. SNMP RMON supported through this management device. RoX-II interface also supports Layer Layer switching provided AL3000. Because AL3000 AL300A functions integrated, there need AL300A AL3000 already RoX-II bus. AL121 also supports trunking applications. chip provides optional load balancing schemes, explicit dynamic. With trunking, possible group eight full-duplex links together form single 1600 Mbit/s link. device also supports current IEEE 802.3ad specification. Data received from interface stored external memory buffer. AL121 utilizes cost effective SGRAM provide Mbit Mbit buffer memory. AL121 provides flow control methods. half-duplex operations, optional jamming based flow control (also known backpressure) available prevent loss data. With this method flow control, switch will generate signal when receive-buffer full. full-duplex mode, AL121 utilizes IEEE 802.3x flow control mechanism. ports support multiple addresses. managed switch applications, AL121 supports network management through network management option. When management option enabled, network statistics each port gathered sent across RoX-II bus. management information base chip will collect store data network management agent. Access statistic counters provided interface AL300A. AL121 operates only store forward mode. entire frame checked errors frames with errors automatically filtered forwarded destination port. device also provides multicast group addresses multicast applications. switch initialized configured external EEPROM. unmanaged switch design, there need CPU. parallel interface utilized reprogram EEPROM field reconfiguration. device supports port based VLAN workgroup segment switching applications. device also provides levels security intrusion protection. Security implemented per-port basis. Other features include port monitoring broadcast storm filtering reduce broadcast traffic through switch.
2/2000
Reference Only Allayer Confidential

Supports seven 10/100 Mbit/s Ethernet ports with RMII 10/100 Mbit/s Et

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