Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 13

Hardware Reference
C613-03023-00 REV J
Figure 10: AT-AR026 4ETH PIC
4
AT-AR026 features include:
• Five integrated switch ports with physical layer transceivers (four 10/
100 Ethernet switch ports, and one fixed 10 Mbps port acting as the PIC
to base unit connector)
• 128 kbytes of frame buffering SRAM
• 1.4 Gbps high performance memory bandwidth
• 10BASE-T and 100BASE-TX modes of operation
• LED indicators for link, activity, full/half duplex, and port speed
• Hardware based 10/100, full/half duplex, flow control, and auto-
negotiation
• Individual port forced modes (full duplex, 100BASE-TX) when auto-
negotiation is disabled
• Wire speed reception and transmission
• Integrated address look-up engine, supporting 1K absolute MAC
addresses
• Automatic address learning, address aging, and address migration
• Broadcast storm protection
• Full duplex IEEE 802.3x flow control
• Half duplex back pressure flow control
• MDI/MDI-X auto cross over support
Some features (such as autonegotiation, buffer size, and MAC address aging)
are configured by adding or removing links on the PIC's PCB.
page 15 lists the configurable features, their respective links, and their default
settings.
Table 8: AT-AR026 4ETH PIC LED functions (Two LEDs per port)
LED Function
Left Lit when the port is operating at 100Mbps and full duplex.
Right Lit when a link has been established. Flashing when data is being transmitted
through the port.
10BaseT/100BaseTX Ethernet ports
(RJ45 connectors)
LEDs
13
1
AR026PIC
Table 9 on