Cabletron Systems BRIM E100 BRIM-E100 - Manual (Page 14)

BRIM-E100 User’s Guide Page 2-1
CHAPTER 2
CABLING REQUIREMENTS
This chapter describes the cabling requirements for the BRIM-E100. The
network must meet the requirements and conditions specified in this
chapter to obtain satisfactory performance from this equipment. Failure to
follow these guidelines could result in poor network performance.
2.1 UTP CABLE SPECIFICATIONS
The BRIM-E100 with an FE-100TX Fast Ethernet Interface Module
installed provides an RJ45 connection that supports Unshielded Twisted
Pair (UTP) cabling. The device at the other end of the twisted pair
segment must meet IEEE 802.3u 100BASE-TX specifications in order for
the devices to operate properly at 100 Mbps. Use Category 5 UTP cabling
for networks operating at 100 Mbps. Category 3, 4, or 5 UTP cabling may
be used for networks operating at 10 Mbps.
When connecting a 100BASE-TX Twisted Pair Segment to the
BRIM-E100 twisted pair network port, the network must meet the
following requirements:
Length
The IEEE 802.3u 100BASE-TX standard requires that 100BASE-TX
devices be capable of transmitting over a 100 meter (328 foot) link using
Category 5 UTP cable or Category 3, 4, or 5 cable for 10 Mbps operation.
Impedance
Unshielded Twisted Pair cables typically have an impedance from 85 to
110 ohms.
NOTE
The BRIM-E100 with an FE-100TX Fast Ethernet Interface
Module installed is capable of operating at either 10 or 100
Mbps. The FE-100TX automatically senses the speed of the
other device and adjusts its speed accordingly.
book Page 1 Friday, April 19, 1996 9:53 AM