Figure 3‐4, Ав б, 2tx rx – Enterasys Networks 2G4072-52 User Manual

Page 32

Connecting to the Network

3-6 Installation

Figure 3-4 Connecting a Twisted Pair Segment to the 2G4072-52

Verify that a link exists by checking that the port RX (Receive) LED is ON (flashing
amber, blinking green, or solid green). If the RX LED is OFF and the TX (Transmit)
LED is not blinking amber, perform the following steps until it is on:

To view the receive and transmit activity on a group of segments, press the
GROUP SELECT button (see

Figure 3‐4

) to step to the group of interest (Groups 1

through 3). Each time the button is pressed, the GROUP LED lights up in
sequence, indicating the selected Group. Receive and transmit activity for that
group of segments is then indicated by the RX and TX LEDs for each segment.

b. Verify that cabling is Category 5 UTP with an impedance between 85 and

111 ohms. If the port is to operate at 100 Mbps, Category 5 cabling must be used.

Verify that the device at the other end of the twisted pair segment is on and
properly connected to the segment.

d. Verify that the RJ45 connectors on the twisted pair segment have the proper

pinouts and check the cable for continuity. Typically, a crossover cable is used
between hub devices. A straight‐through cable is used to connect between
switches or hub devices and an end user (computer). Refer to

Figure 3‐5

and

Figure 3‐6

for four‐wire RJ45 connections. Refer to

Figure 3‐7

and

Figure 3‐8

for

eight‐wire RJ45 connections.

1 RJ45 connector

2 RJ45 port connector

3 GROUP SELECT button

RESET

CONSOLE

CPU

PWR

GROUP

SELECT

GROUP 3

GROUP 2

GROUP 1