Milan e-fl-hb-0400 ユーザーズマニュアル
E-FL-HB-0x00 in Half-Duplex Network
The 5-4-3 Rule applies separately to each collision domain. NOTE: A
collision domain is any Carrier Sense Multiple Access with Collision Detection
(CSMA/CD) network in which a collision will occur if two attached stations
transmit at the same time. A segment is the cable connection between two
network interfaces.
collision domain is any Carrier Sense Multiple Access with Collision Detection
(CSMA/CD) network in which a collision will occur if two attached stations
transmit at the same time. A segment is the cable connection between two
network interfaces.
USING THE 5-4-3 RULE:
The 5-4-3 Rule allows no more than five segments in any 10-Mb/sec
Ethernet collision domain, no more than four repeaters (hubs) and no
more than three populated segments (10Base-2 or 10BASE-5 coaxial-
cable installations).
Ethernet collision domain, no more than four repeaters (hubs) and no
more than three populated segments (10Base-2 or 10BASE-5 coaxial-
cable installations).
To determine the size of the collision domain by assigning segment
numbers to cable connections, determine the two network devices in a
transmission path that are separated by the greatest number of segments.
Define a segment path between the network devices by labeling the
cable connection to the first device “segment 1” and numbering each
segment in the path to the last network device, up to “segment n” (n =
total number of segments
numbers to cable connections, determine the two network devices in a
transmission path that are separated by the greatest number of segments.
Define a segment path between the network devices by labeling the
cable connection to the first device “segment 1” and numbering each
segment in the path to the last network device, up to “segment n” (n =
total number of segments
≤
5). Verify that no segment path in the entire
collision domain contains more than n
≤
5 segments.
STAT
10BASE-FL
1
2
3
4
5
6
7
8
PWR
COL
ACT
BB
1
3
2
4
5
7
6
8
STAT
10BASE-FL
1
2
3
4
5
6
7
8
PWR
COL
ACT
BB
1
3
2
4
5
7
6
8
STAT
10BASE-FL
1
2
3
4
5
6
7
8
PWR
COL
ACT
BB
1
3
2
4
5
7
6
8
STAT
10BASE-FL
1
2
3
4
5
6
7
8
PWR
COL
ACT
BB
1
3
2
4
5
7
6
8
1
2
3
3
3
4
4
4
4
5
CABLE SPECIFICATIONS
10BASE-2 Cable Specifications
10BASE-2 CABLE CHARACTERISTICS:
Cable type:
Stranded Coaxial RG58 (ThinNet)
Impedance: 50
Ω
@ 10 MHz
Mutual Capacitance:
24 pF/ft ±20% @ 10 MHz
Maximum Cable Length:
185 meters (610 feet)
Maximum number network connections:
30
Minimum distance between connections:
0.5 meters (1.6 feet)
Terminate 10BASE-2 cable at one end using a 50 ohm terminator and at the other end
using a 50 ohm terminator grounded to earth ground.
using a 50 ohm terminator grounded to earth ground.
AUI/10BASE-5 Cable Specifications
10BASE-5 CABLE CHARACTERISTICS:
Cable type:
RG8 Solid Coaxial (ThickNet)
Impedance: 50
Ω
@ 10 MHz
Capacitance:
26pF/ft
Maximum Cable Length:
500 meters (1650 feet)
Maximum number network connections:
100
Minimum distance between connections:
2.5 meters (8.2 feet)
Terminate 10BASE-5 cable at one end using a 50 ohm terminator and at the other end
using a 50 ohm terminator grounded to earth ground.
using a 50 ohm terminator grounded to earth ground.
AUI CABLE AND CONNECTOR SPECIFICATIONS
The cable is a special 4-pair individually shielded with an overall braided shield.
Maximum AUI Cable Length:
Maximum AUI Cable Length:
50 meters (165 feet)
AUI CONNECTOR CHARACTERISTICS:
AUI Port:
Male DB-15 with locking posts.
AUI Connection:
Cable shell must be grounded.
Connector Legend:
1 Logic Ref.
6 Power Return
11 Logic Ref
2 Collision+
7 N/C
12 Receive
3 Transmit+
8 Logic Ref.
13 Power
4 Logic Ref.
9 Collision--
14 Logic Ref.
5 Receive+
10 Transmit-
15 N/C
10BASE-FL Cable Specifications
Fiber Optic Cable Recommended:
62.5 / 125 µm multimode fiber
Optional:
100 / 140 µm multimode fiber
85 / 125 µm multimode fiber
50 / 125 µm multimode fiber
85 / 125 µm multimode fiber
50 / 125 µm multimode fiber
Wavelength
1300 nM
Fiber Optic Transmitter Power:
min: -__._ dBm
max: -__._ dBm
Fiber Optic Receiver Sensitivity:
min: -__._ dBm
max: -__._ dBm
Typical Maximum Cable Distance*:
2000 meters (6600 feet)
*Actual distance dependent upon physical characteristics of network installation.