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Hitachi Gigabit Router GR2000-B Series Installation Guide
3.2.15
UTP Cable (Cat-5)
The boundary with the network is the router's connector. For connection to the hub
of 100BASE-TX port at 100 Mbit/s, use UTP interface cable (Category 5). You may
use the Category 3 UTP interface cable when connecting only to the 10BASE-T (10
Mbit/s) port. The maximum transmission distance between the GR2000-B and a 10
Mbit/s or 100 Mbit/s hub is 100 m.
Figure 3-12 and Table 3-4 below show a diagram of the twist pair cable and the pin
arrangement, respectively.
RJ45
Figure 3-20 UTP Cable (CAT-5)
Table 3-14 Pinout for GR2000-B 10BASE-T/100BASE-TX Interface
Pin No. Specification
1
Transmit (+) (A)
2
Transmit (-) (a)
3
Receive (+) (B)
4
Unused (Note 1) (C)
5
Unused (Note 1) (c)
6
Received (-) (b)
7
Unused (Note 1) (D)
8
Unused (Note 1) (d)
Note 1:
This should be connected to the port when using 100BASE-TX. When using 10BASE-T, it can
be disconnected or connected.
Note 2:
Because the interface uses differential, twisted pairs of wires, make (A) and (a), (B) and (b), (C)
and (c), and (D) and (d) into a pairs when using 100BASE-TX. Make (A) and (a), and (B) and (b) into a
pair when using 10BASE-T. The other pins can be connected to one another without particular regard,
or may be left open.
3-18
Lm
1. CAT-5 UTP Cable (4 Pairs)
2. 8-Pin Modular Connector (RJ45)
1
+1
m
-0
L = Specified Length
2
RJ45
GR2K-GA-0007
Rev. 5.00
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