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Fast Ethernet/Ethernet RJ-45 Port Pinouts
GBIC-ZX or WS-G5487
The 1000BASEZX (extended wavelength) GBIC operates on ordinary single-mode fiber-optic link spans
of up to 43.5 miles (70 km). Link spans of up to 62.1 miles (100 km) are possible using premium
single-mode fiber or dispersion-shifted single-mode fiber (premium single-mode fiber has a lower
attenuation per unit length than ordinary single-mode fiber; dispersion-shifted single-mode fiber has
both lower attenuation and less dispersion).
The 1000BASEZX GBIC must be coupled to single-mode fiber-optic cable, which is the type of cable
typically used in long-haul telecommunications applications. The 1000BASE-ZX GBIC will not operate
correctly when coupled to multimode fiber, and it is not intended to be used in environments where
multimode fiber is frequently used (for example, building backbones, horizontal cabling).
The 1000BASEZX GBIC is intended to be used as a Physical Medium Dependent (PMD) component for
Gigabit Ethernet interfaces found on various switch and router products. It operates at a signaling rate
of 1250 Mbaud, transmitting and receiving 8B/10B encoded data.
When shorter lengths of single-mode fiber are used, it may be necessary to insert an in-line optical
attenuator in the link to avoid overloading the receiver.
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•
Note
Fiber-optic cables are commercially available; they are not available from Cisco Systems.
Fast Ethernet/Ethernet RJ-45 Port Pinouts
The Cisco 7401ASR router has RJ-45 ports for the two Fast Ethernet/Ethernet connections. The RJ-45
ports support IEEE 802.3 (Ethernet) and IEEE 802.3u (Fast Ethernet) interfaces compliant with
10BASET and 100BASETX specifications.
The RJ-45 ports support standard straight-through and crossover Category 5 UTP cables with RJ-45
connectors. Cisco Systems does not supply Category 5 UTP cables; these cables are available
commercially.
To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network
Warning
voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some
LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables.
Figure A-1
Cisco 7401ASR Installation and Configuration Guide
A-6
Insert a 10-dB in-line optical attenuator between the fiber-optic cable plant and the receiving port
on the 1000BASEZX GBIC at each end of the link whenever the fiber-optic cable span is less than
15.5 miles (25 km).
Insert a 5-dB in-line optical attenuator between the fiber-optic cable plant and the receiving port on
the 1000BASEZX GBIC at each end of the link whenever the fiber-optic cable span is equal to or
greater than 15.5 miles (25 km) but less than 31 miles (50 km).
shows an RJ-45 port and connector.
Table A-8
lists the pinouts and signals for the RJ-45 port.
Appendix A
Specifications
OL-5419-01 B0
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