Information Technology Reference
In-Depth Information
The 10BaseT specifications are as follows:
•
24 AWG UTP .4/.6 mm cable.
•
Maximum segment length is 100 m.
•
1 device per cable.
The media specifications for 100Base-TX are as follows:
•
Transmission over Cat 5 UTP or Cat 1 STP wire.
•
RJ-45 connector (same as in 10BaseT).
•
Punchdown blocks in the wiring closet must be Category 5 certified.
•
4B5B coding.
IBM and IEEE 802.5 Token Ring Specification Similarities
Table 4-14
Specification
IBM Token Ring
IEEE 802.5
Data Rate
4 or 16 Mbps
4 or 16 Mbps
4 Mbps only, on UTP
Stations per segment
260 (on STP)
72 (on UTP)
250 (on STP)
72 (on UTP)
Physical Topology
Star
Not specified
Media
Twisted pair
Not specified
Signaling
Baseband
Baseband
Access Method
Token passing
Token passing
Encoding
Differential Manchester
Differential Manchester
To ken Ring Characteristics
Table 4-15
Token Ring Function
Description
Active Monitor (AM)
Acts as the centralized source of timing information for other ring
stations and performs a variety of ring-maintenance functions.
Beaconing
A beacon frame is sent by a station that does not receive any more
frames from its upstream neighbor.
Early Token Release (ETR)
A token is released immediately after the sending station transmits its
frame.
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