Allied Telesis AT-SBX31GC40 User Manual

Chapter 1: Overview

28

The AT-SBx31GT40 Line Card, shown in Figure 12, is a Gigabit Ethernet 
switch.

Figure 12. AT-SBx31GT40 Line Card

Here are the main features of the line card:



40 10/100/1000Base-T ports



RJ point 5 connectors



100 meters (328 feet) maximum operating distance per port



Auto-Negotiation for speed



Full-duplex mode only



Automatic MDIX detection for ports operating at 10/100Base-TX, 
(Automatic MDIX detection does not apply to 1000Base-T 
operation.)



Port Link/Activity (L/A) LEDs



32K entry MAC address table



32 Mb buffer memory



Jumbo frame support:
– 10240 octets for tagged and untagged traffic 

between ports on the same line card

– 10232 octets for untagged traffic between ports on 

different line cards

– 10236 octets for tagged traffic between ports on 

different line cards



Non-blocking full-wire speed switching on all packet sizes, with two 
AT-SBx31CFC Central Fabric Controller cards



Hot swappable

The ports on the line card do not support half-duplex operation.

The cable requirements for the ports on the AT-SBx31GT40 Line Card are 
listed in Table 1 on page 36.