H3C Technologies H3C S12500 Series Switches - Manual (Page 10)

4
Interface type
Central
wavelength (nm)
Fiber grade Transmission distance
10GBASE-SR 850
OM1 < 33 m (108.27 ft)
OM2 < 82 m (269.03 ft)
OM3 < 300 m (984.25 ft)
10GBASE-LRM 1310
OM1 < 220 m (721.78 ft)
OM2 < 220 m (721.78 ft)
OM3 < 220 m (721.78 ft)
• Single-mode fibers
Single-mode fibers (SMFs) have a small core size, typically 9 μm or 10 μm, and can transmit light
in only one mode. Single-mode fibers suffer little inter-mode dispersion and are suitable for
long-reach communication. Single-mode fibers transmit light at the central wavelength of 1310
nm or 1550 nm.
Telecommunication Industries Alliance (TIA)/Electronic Industries Alliance (EIA) defines that
single-mode fibers use yellow outer jackets with the mark "SM".
ITU defines single-mode fiber types in its G series standards. The mostly-commonly used
single-mode fibers are defined in ITU G.652 and G.655 standards.
Table 4 describes features of
the G.652 and G.655-compliant fibers.
Table 4 Features of G.652 and G.655-compliant fibers
Single-mode fiber
type
Wavelength (nm) Features Applications
G.652-compliant
fiber (standard
single-mode fiber)
• 1260 to 1360
• 1530 to 1565
Zero dispersion at 1310
nm.
Connecting transceiver
modules with a central
wavelength of 1310
nm or 1550 nm.
G.655-compliant
fiber (non-zero
dispersion shifted
fiber)
1530 to 1565
Near-zero dispersion
around 1550 nm.
For 1550-nm
wavelength-division
multiplexing (WDM)
transmissions.
Fiber diameter
Fiber diameter is generally expressed as core diameter/cladding diameter, in μm. For example, 9/125
μm means the fiber core diameter is 9 μm and the fiber cladding diameter is 125 μm.
For the H3C devices, the following fiber diameters are recommended:
• G.652 standard single-mode fiber—9/125 μm.
• G.655 single-mode fiber—9/125 μm.
• G.651 standard multimode fiber—50/125 μm or 62.5/125 μm.
Connector
CAUTION:
Cover the connector with a dust cap when it is not connected to any optical fiber.