Enterasys SecureStack A2 A2H254-16 Hardware Installation Manual page 58

Connecting to the Network
3. Verify that a link exists by checking that the Link/Activity LED is ON (solid green or
blinking green). If the Link/Activity LED is OFF, perform the following steps until it is
on:
a.
b. Verify that the device at the other end of the twisted pair segment is on and
c.
d. Ensure that the twisted pair connection meets the dB loss and cable specifications
4. If a link is not established, contact Enterasys Networks. Refer to "Getting Help" on
page 1‐6 for details.
Repeat all steps above until all connections have been made.
3-30 Hardware Installation
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 meters (328 feet).
properly connected to the segment.
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 3‐17 and
Figure 3‐18 for four‐wire RJ45 connections. Refer to Figure 3‐19 and Figure 3‐20
for eight‐wire RJ45 connections.
outlined in the Cabling Guide. Refer to "Related Documents" on page xiv for
information on obtaining this document.