Passport 8148TX Edge Switch Module. 48 port 10/100Base-TX The 8648TX module provides 48 switched auto-sensing 10BASE-T/100BASE-TX ports using RJ45 connectors. The module supports both full- and half-duplex operation, and complies with IEEE 802.3u for auto-negotiation. Embedded within each port connector are two unicolor LEDs that display speed (left side of port) and link/activity (right side of port). When the port is operating at 100 Mbps, the speed LED is illuminated. When the link/activity LED is off, the port is disabled, partitioned, or has no link. Steady green indicates a good link without traffic, and a flashing green indicates either transmitting or receiving traffic. There is one online LED for the module as a whole. For the online LED, "off" indicates the module is not yet functional. Flashing amber indicates initialization, while solid amber indicates failed power-on-self-test. Green indicates successfule initialization.