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Transition Networks E-TEL-1200 Benutzerhandbuch

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CABLE SPECIFICATIONS
(continued)
COPPER CABLE 
Each RJ-45 connector requires 2 pairs of Category 5 rated cable.
The 50-pin Telco connector requires 24 pairs of Category 5 rated
cable.
Either shielded twisted-pair (STP) or unshielded twisted-pair (UTP) can
be used. DO NOT USE FLAT OR SILVER SATIN WIRE.
CATEGORY 5:
Gauge
24 to 22 AWG
Attenuation 
22.0 dB /100m @ 100 MHz
Maximum Cable Distance:
Telco
75 meters
RJ-45
100 meters
TELCO CONNECTOR
TELCO SIGNALS
Media Converter Port in Full-Duplex Network
In a full-duplex network, maximum cable lengths are determined by the
cables used. See page 10 for cable specifications. 
NOTE: The 512-Bit Rule described below does NOT apply in a full-duplex
network.
Media Converter Port in Half-Duplex Network
The 512-Bit Rule applies separately to each collision domain.
USING THE 512-BIT RULE
In a half-duplex network, maximum cable lengths are determined by the
round trip delay limitations of each Fast Ethernet
™
collision domain.
(Switches and routers divide the network into separate Ethernet™
collision domains.) The 512-Bit Rule determines maximum distances by
calculating the collision domain round-trip delay in bit-times. 
To calculate a collision domain round-trip delay in bit-times, find the
longest path between any two
terminal devices in the collision
domain. Calculate the round
trip delay by multiplying the
length of the cable (in meters)
by the delay per meter (in bit-
times (BT)), then take the sum of
all cable delays plus station
(DTE), repeater, and multi-port
media converter port delays. If
the result is less than or equal to 512 bit-times, the path is good. 
Class I repeater
140 BT
Class II repeater
92 BT
Class I TX/FX media converter
130 BT
Class II TX/FX media converter
92 BT
DTE (PC, switch, router)
50 BT
E-TX-FX-xx00 port
15 BT
1 meter CAT.5 TP cable
1.11 BT
1 meter fiber cable
1 BT
Fast Ethernet switch
50 BT
10 meters TP 
@ 1.11BT/meter 
= 11.1BT
DTE= 50BT
Class II
Hub
= 92BT
10 meters TP 
@ 1.11BT/meter 
= 11.1BT
10 meters TP 
@ 1.11BT/meter 
= 11.1BT
E-TX-FX-xx
Port
= 15BT
DTE= 50BT
150 meters fiber 
@ 1.0 BT/meter 
= 150BT
10 meters TP 
@ 1.11BT/meter 
= 11.1BT
Class I
Hub
= 140BT
Half-Duplex Collision Domain
50.00BT
+11.10BT
+140.00BT
+150.00BT
+15.00BT
+11.10BT
+50.00BT
__________
_
= 437.20BT
Half-Duplex Collision Domain
200 meters fiber 
@ 1.0 BT/meter 
= 200BT
DTE= 50BT
50.00BT
+11.10BT
+92.00BT
+200.00BT
+15.00BT
+11.10BT
+50.00BT
__________
_
= 439.20BT
Full-Duplex - NO Collision Domain
Switch/
Router
= 50BT
E-TX-FX-xx
Port
= 15BT
E-TX-FX-xx
Port
= 15BT
NOTE: Media converter
port is 15 bit-times IN
and 15 bit-times OUT =
30 bit-times round-trip.
Pin # Signal
Pin # Signal
1
Port 1 Transmit -
26
Port 1 Transmit +
2
Port 1 Receive -
27
Port 1 Receive +
3
Port 2 Transmit -
28
Port 2 Transmit +
4
Port 2 Receive -
29
Port 2 Receive +
5
Port 3 Transmit -
30
Port 3 Transmit +
6
Port 3 Receive -
31
Port 3 Receive +
7
Port 4 Transmit -
32
Port 4 Transmit +
8
Port 4 Receive -
33
Port 4 Receive +
9
Port 5 Transmit -
34
Port 5 Transmit +
10
Port 5 Receive -
35
Port 5 Receive +
11
Port 6 Transmit -
36
Port 6 Transmit +
12
Port 6 Receive -
37
Port 6 Receive +
13
Port 7 Transmit -
38
Port 7 Transmit +
14
Port 7 Receive -
39
Port 7 Receive +
15
Port 8 Transmit -
40
Port 8 Transmit +
16
Port 8 Receive -
41
Port 8 Receive +
17
Port 9 Transmit -
42
Port 9 Transmit +
18
Port 9 Receive -
43
Port 9 Receive +
19
Port 10 Transmit -
44
Port 10 Transmit +
20
Port 10 Receive -
45
Port 10 Receive +
21
Port 11 Transmit -
46
Port 11 Transmit +
22
Port 11 Receive -
47
Port 11 Receive +
23
Port 12 Transmit -
48
Port 12 Transmit +
24
Port 12 Receive -
49
Port 12 Receive +
25
N.C.
50
N.C.
1
25
26
50