Cisco 2948G Hardware Installation Guide - Page 87

SFP Module, Wavelength, nanometers, Fiber Type, Core Size, micron, Modal, Bandwidth, MHz/km

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Chapter 4 Configuring the Gigabit Ethernet Ports Connecting To an SFP Module The restrictions are that each port must match the wave-length specifications on the other end of the cable, and the cable must not exceed the recommended cable length for reliable communications. Table 4-5 lists these recommendations. Table 4-5 Fiber-Optic SFP Module Port Cabling Specifications SFP Module Wavelength (nanometers) Fiber Type Core Size (micron) Modal Bandwidth (MHz/km) Cable Distance 1000BASE-SX 850 1000BASE-LX/LH 1300 MMF MMF1 SMF 62.5 160 62.5 200 50.0 400 50.0 500 62.5 500 50.0 400 50.0 500 9/10 - 722 ft (220 m) 902 ft (275 m) 1640 ft (500 m) 1804 ft (550 m) 1804 ft (550 m) 1804 ft (550 m) 1804 ft (550 m) 6.2 mi (10 km) 1000BASE-ZX 1550 SMF 9/10 - 43.4 to 62 mi (70 to 100 km)2 1. A mode-conditioning patch cord is required. Using an ordinary patch cord with MMF, 1000BASE-LX/LH SFP modules, and a short link distance can cause transceiver saturation, resulting in an elevated bit error rate (BER). When using the LX/LH SFP module with 62.5-micron diameter MMF, you must also install a mode-conditioning patch cord between the SFP module and the MMF cable on both the sending and receiving ends of the link. The mode-conditioning patch cord is required for link distances greater than 984 feet (300 m). 2. 1000BASE-ZX SFP modules can reach up to 100 km by using dispersion-shifted SMF or low-attenuation SMF; the distance depends on the fiber quality, the number of splices, and the connectors. Note For information about the Coarse Wave Division Multiplexing (CWDM), refer to the Cisco CWDM GBIC and CWDM SFP Installation Note. The 1000BASE-T (copper) SFP module is used to establish a Gigabit Ethernet connection through a Category 5 Category 5 cable. Use only Cisco SFP modules on the Catalyst 2948G-GE-TX switch. Each SFP module has an internal serial EEPROM that is encoded with security information. This encoding provides a way for Cisco to identify and validate that the SFP module meets the requirements for the switch. 78-6286-05 Catalyst 2984G, 2948G-GE-TX, and 2980G Switch Hardware Installation Guide 4-13

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4-13
Catalyst 2984G, 2948G-GE-TX, and 2980G Switch Hardware Installation Guide
78-6286-05
Chapter 4
Configuring the Gigabit Ethernet Ports
Connecting To an SFP Module
The restrictions are that each port must match the wave-length specifications on
the other end of the cable, and the cable must not exceed the recommended cable
length for reliable communications.
Table 4-5
lists these recommendations.
Note
For information about the Coarse Wave Division Multiplexing (CWDM), refer to
the
Cisco CWDM GBIC and CWDM SFP Installation Note
.
The 1000BASE-T (copper) SFP module is used to establish a Gigabit Ethernet
connection through a Category 5 Category 5 cable.
Use only Cisco SFP modules on the Catalyst 2948G-GE-TX switch. Each SFP
module has an internal serial EEPROM that is encoded with security information.
This encoding provides a way for Cisco to identify and validate that the SFP
module meets the requirements for the switch.
Table 4-5
Fiber-Optic SFP Module Port Cabling Specifications
SFP Module
Wavelength
(nanometers)
Fiber Type
Core Size
(micron)
Modal
Bandwidth
(MHz/km)
Cable Distance
1000BASE-SX
850
MMF
62.5
62.5
50.0
50.0
160
200
400
500
722 ft (220 m)
902 ft (275 m)
1640 ft (500 m)
1804 ft (550 m)
1000BASE-LX/LH
1300
MMF
1
SMF
1.
A mode-conditioning patch cord is required. Using an ordinary patch cord with MMF, 1000BASE-LX/LH SFP modules, and
a short link distance can cause transceiver saturation, resulting in an elevated bit error rate (BER). When using the LX/LH
SFP module with 62.5-micron diameter MMF, you must also install a mode-conditioning patch cord between the SFP module
and the MMF cable on both the sending and receiving ends of the link. The mode-conditioning patch cord is required for link
distances greater than 984 feet (300 m).
62.5
50.0
50.0
9/10
500
400
500
—
1804 ft (550 m)
1804 ft (550 m)
1804 ft (550 m)
6.2 mi (10 km)
1000BASE-ZX
1550
SMF
9/10
—
43.4 to 62 mi (70 to
100 km)
2
2.
1000BASE-ZX SFP modules can reach up to 100 km by using dispersion-shifted SMF or low-attenuation SMF; the distance
depends on the fiber quality, the number of splices, and the connectors.