Enterasys Matrix E1 Series Installation Manual page 49

3. Verify that a link exists by checking that the Link LED
is OFF, and the RX/TX LED
a. Verify that the cabling being used is Category 5 or better with an impedance between 85 and
111 ohms with a maximum length of 100 m (328 ft.).
b. Verify that the device at the other end of the twisted pair segment is on and properly
connected to the segment.
c. 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 3-16 and
d. Ensure that the twisted pair connection meets the dB loss and cable specifications outlined
in the Cabling Guide. Refer to
on obtaining this document.
4. If a link is not established, contact Enterasys Networks. Refer to
for details.
Repeat all the steps above until all connections have been made.
Figure 3-14 Four-Wire Crossover Cable RJ45 Pinouts for 10/100BASE-TX
Ã
➀
RJ45 device port
➁
Other device port
➂
is not blinking amber, perform the following steps until it is on:
Figure 3-14 and
Figure 3-17 for eight-wire RJ45 connections.
"Related
À
RX+ 1
RX– 2
TX+ 3
TX– 6
➁
is ON (solid green). If the Link LED
Figure 3-15 for four-wire RJ45 connections. Refer to
Documents" in About This Guide for information
Â
➂
RJ45-to-RJ45 crossover cable
➃
RX+/RX- and TX+/TX- connections.
These connections must share a common color pair.
Connecting to the Network
"Getting Help" in Section 1.4
Á
1 RX+
2 RX–
3 TX+
6 TX–
Hardware Installation 3-21