Connecting to the Network
3-12 Hardware Installation
Figure 3-11 Eight-Wire Straight-Through Cable RJ45 Pinouts for 10/100/1000BASE-T
3.5.2 Connecting Fiber-Optic Cables to MT-RJ Ports
This section contains the procedures for connecting a 1000BASE-SX multimode fiber-optic
segment from the network or other devices to an MT-RJ port connector of a Mini-GBIC
(MGBIC-MT01) in front panel port 50 or 52.
Each fiber-optic link consists of two fiber-optic strands within the cable:
• Transmit (TX)
• Receive (RX)
The transmit strand from a device port connects to the receive port of a fiber-optic Fast Ethernet
device at the other end of the segment. The receive strand of the applicable MT-RJ port connects to
the transmit port of the fiber-optic Fast Ethernet device.
Enterasys Networks recommends labeling fiber-optic cables to indicate receive and transmit ends.
Many cables are pre-labeled, providing matching labels or tapes at both ends of each strand of
cable.
RJ45 device port
RJ45-to-RJ45 straight-through cable
Other device port
WARNING: Mini-GBICs use Class 1 lasers. Do not use optical instruments to view the
laser output. The use of optical instruments to view laser output increases eye hazard.
When viewing the output optical port, power must be removed from the network adapter.
3680_29
TX1+
TX2+
RX4-
RX1-
TX4+
RX3-
TX3+
RX2-
2
1
3
6
4
5
7
8
TX2+
TX1+
RX3-
RX2-
TX3+
RX4-
TX4+
RX1-
2
1
3
6
4
5
7
8
À
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Á
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