Cisco 7600-SIP-400 - SPA Interface Processor 400 Installation Manual page 287

Appendix B Connector and Cable Specifications
WS-G5484
The WS-G5484 GBIC (1000BASE-SX) operates on ordinary multimode fiber-optic link spans of up to
550 meters in length.
WS-G5486
The WS-G5486 GBIC (1000BASE-LX/LH) interfaces fully comply with the IEEE 802.3z
1000BASE-LX standard. However, their higher optical quality allows them to reach 10 km over
single-mode fiber (SMF), versus the 5 km specified in the standard.
WS-G5487
The WS-G5487 GBIC (1000BASE-ZX) operates on ordinary single-mode fiber-optic link spans of up to
70 km in length. Link spans of up to 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 per unit
length and less dispersion.)
The WS-G5487 GBIC must be coupled to single-mode fiber-optic cable, which is the type of cable
typically used in long-haul telecommunications applications. The WS-G5487 GBIC will not operate
correctly when coupled to multimode fiber, and it is not intended to be used in application environments
(e.g., building backbones or horizontal cabling) where multimode fiber is frequently used.
The WS-G5487 GBIC is intended to be used as a physical medium dependent (PMD) component for
Gigabit Ethernet interfaces, as found on various switch and router products. It will operate at a signaling
rate of 1250 MBaud, transmitting and receiving 8B/10B encoded data.
When shorter distances of single-mode fiber are used, you might need to insert an in-line optical
attenuator in the link to avoid overloading the receiver:
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GBICs use an SC-type connector to link the module to the fiber-optic cable.
Dense Wavelength Division Multiplexing (DWDM) GBIC Transceivers
DWDM GBIC transceivers are used as part of a DWDM optical network to provide high-capacity
bandwidth across an optical fiber network. There are 32 fixed-wavelength GBICs that support the
International Telecommunications Union (ITU) 100 GHz wavelength grid. Refer to your release notes
for a list of compatible modules and the software release level necessary to support these DWDM
GBICs.
OL-4503-26
Insert a 10-dB in-line optical attenuator between the fiber-optic cable plant and the receiving port
on the WS-G5487 GBIC at each end of the link whenever the fiber-optic cable span is less than
25 km.
Insert a 5-dB in-line optical attenuator between the fiber-optic cable plant and the receiving port on
the WS-G5487 GBIC at each end of the link whenever the fiber-optic cable span is equal to or
greater than 25 km and less than 50 km.
Figure B-7 shows the physical form of the DWDM GBIC.
Connector Specifications
Cisco 7600 Series Router Installation Guide
B-5