User guide

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
Writer:
Chris Seiter
Project:
Planning Installation
Comments:
299440-001
File Name:
2824_2.DOC
Last Saved On:
6/27/97 3:51 PM
100Base-TX
100Base-TX is the IEEE 802.3u specification for transmitting 100 Mb/s
Fast Ethernet over two pairs of copper wire. The pinout, connectors (RJ-45
modular plugs), and protocol (CSMA/CD) are exactly the same as
for 10Base-T.
Unshielded Twisted Pair (UTP)
■
Category 5 only
■
Two pairs used (same as 10Base-T)
■
Maximum 100-meter (328-foot) link
Figure 2-1 shows a one-to-one cable pinout for 100Base-TX.
Figure 2- 1.
One-to-One Cable Pinout for 100Base-TX
NOTE:
To prevent potential electromagnetic interference, terminate the unused
wires (4, 5, 7, and 8).
Tables 2-1 and 2-2 show the wiring for straight-through and crossover twisted-
pair cable.
Table 2- 1
Straight-Through Twisted-Pair Wiring
Twisted Pair Number Pin Number Signal
Description
To Pin Number Signal
Description
11
2
TD+
TD-
➔
➔
1
2
TD+
TD-
23
6
RD+
RD-
➔
➔
3
6
RD+
RD-