ServerNet Cluster Manual

Fiber-Optic Cable Information
ServerNet Cluster Manual—520575-003
G-3
Optical Characteristics
Optical Characteristics
As specified by IEEE 802.3z, the fiber-optic cable requirements are satisfied by the
fibers specified in IEC 793-2;1992 for the type B1 (10/125 µm single mode) with the
exceptions noted in Table G-1.
Optical Fiber Connection
An optical connection consists of a mated pair of optical connectors. The Physical
Media Dependent (PMD) is coupled into the fiber optic cabling through a connector
plug into the MDI optical receptor as shown in Figure G-4.
Insertion Loss
The insertion loss is specified for a connection that consists of a mated pair of optical
connectors. You must not exceed the 4.5dB channel loss specified in Table G-2.
For example, assume a 1000-meter channel has six connections, each with an
average of 0.5 dB loss per connection. This combined with .5 dB loss per Km would
result in a total attenuation of 3.5 dB, which is 1 dB less than the maximum channel
loss.
Table G-2 lists the insertion loss for single-mode fiber-optic cables.
.
You can use connections with different loss characteristics if the requirements in
Table G-1 and Table G-2 are met.
Table G-1. Optical Fiber and Cable Characteristic
Description 9 µm SMF
Nominal fiber specification wavelength 1310 nm
Fiber cable attenuation (max) 0.5 dB/Km
Zero dispersion wavelength (λ
0
) 1300 nm <= λ
0
<= 1324 nm
Dispersion slope (max) (S
0
) 0.093 ps / nm
2
* km
Table G-2. Single-Mode Fiber Insertion Loss
Description 10 µm Single-Mode Fiber
Wavelength 1310 nm
Operating Distance For connections between a node and a cluster switch, a maxi-
mum of 80 m is supported. For connections in a multilane link
,
see Table 2-4, Cable Length Requirements for Multilane Links,
on page 2-11.
Channel Insertion Loss 4.5 db typical
SC Connector Loss 0.5 typical