McAfee M3050 - Network Security Platform Guía de instalación descargar pdf (Pagina 22)

C HAPTER 7

How dongles work

Dongles, included with all 10/100-port McAfee

Network Security Sensors (Sensors), are

required when a 10/100 Sensor port runs in SPAN or inline fail-closed mode.

All 10/100 ports on the Sensors are standard 10/100 Base-T Ethernet ports. As such, they

make use of only 4 of the 8 wires in a Category 5/6 twisted pair cable:

Pin Function

1 Tx

2 Tx

3 Rx

6 Rx

Pins 1 and 2 are used to transmit (Tx) signals, pins 3 and 6 are used to receive (Rx)

signals, and pins 4, 5, 7, and 8 are not used.

When a port pair operates in inline fail-open mode, the signals are “crossed” to allow for

the normal flow of traffic:

Figure 5: Inline fail-open mode - Signals crossed

In this way, traffic that is received on the Rx pins on one port are sent on the Tx pins on

the other port.

Note: This is the same cross performed by a crossover cable.

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McAfee M3050 - Network Security Platform Guía de instalación Pagina 22