Data Cabling Techniques
20
Table 7: UTP Wiring Specifications
10BASE-T Point-to-
Point Cabling
The standard connection when using a repeater is from a Data
Communications Equipment (DCE) device, such as a repeater, to a DTE
device, such as a workstation NIC. This configuration uses a straight-through
cable. See Figure 13.
On an RJ45 connector, it is important to know where pin 1 is so you can count
your pins correctly. Figure 14 shows the location of pin 1.
Cable
Level
Cable Description
AC Character
Specification
Twist/
Foot
10BASE-T
OK?
1
Unshielded
Untwisted
N/A
CCITT
None
NO!
2
Individual UTP
100 W
±
30 W
RS232 1BASE5
AT&T PDS
None
NO!
3
Typical Individual
UTP
100 W
±
15 W
T1, AT&T ISDN
10BASE-T
IBM Type 3
3-5
YES
4
Enhanced Individual
STP
100 W
±
30 W
EIA, TIA
10BASE-T
NEMA
5-8
YES
5
Individual STP
100 W
±
30 W
EIA, TIA
10BASE-T
8-10
YES
IBM
Type 1
Individual STP
150 W
PCC FT 1
N/A
NO!
Figure 13:
10BASE-T UTP
Cabling Hub-to-MAU
(Straight-Through)
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
TD +
TD -
RD +
Not Used
TD +
TD -
RD +
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
RD -
RD -
UTP MAU
RJ45 PIN
UTP HUB
RJ45 PIN
