CentreCOM
AT-3624TS/AT-3624TRS
Repeaters
45
10BASE-FL/FOIRL Ethernet
The IEEE 802.3 10BASE-FL standard supports up to 2,000 meters
(6,560 ft.) of multimode duplex fiber optic cable in a point-to-point link
which directly attaches two devices. FL is compatible with FOIRL, but
FOIRL supports connections of 1,000 meters (3,280 ft.). Duplex refers to
support for fiber optic cable pairs, enabling a two-cable fiber optic
connection with transmit mode dedicated to one cable and receive mode on
the other. The wide dynamic range of a fiber optic interface allows for an
easy installation. When connecting fiber optic cable, the receiving pin (RD)
is connected to the transmitting pin (TD) and vice versa.
10BASE2 (Thin) Ethernet
For 10BASE2 coax segment configurations, IEEE 802.3 specifications
allow 29 or fewer MAUs per cable segment spaced at no less than
0.5 meter (1.64 ft.). The 10BASE2 cable length can not exceed 185 meters
(607 ft.) per 10BASE2 cable segment. The worst case propagation delay for
a 185 meters (607 ft.) thin Ethernet segment is 950.9 ns. The propagation
delay for 10BASE2 Ethernet cable is 5.14 ns/meter. Both ends of the
segment must be terminated with a 50
Ω
termination with a power rating
of 0.5 watts or greater. Earth grounding of the segment shield must take
place at only one point on the cable.
Figure 22: Hub-to-Hub or
MAU-to-MAU
Wiring
Not Used
RD-
Not Used
Not Used
RD+
TD-
TD+
Not Used
Not Used
RD-
Not Used
Not Used
RD+
TD-
TD+
Not Used
RJ 45 Pin
RJ 45 Pin
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Pair twisted as per level 3, 4 or 5 cable
1
1
1
