Cisco Patch Cable, Mode Conditioning, SC CAB-MCP50-SC= 用户手册
产品代码
CAB-MCP50-SC=
Product Bulletin
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Page 2 of 4
Figure 1. Mode Conditioning Patch Cable Installation
Types of Multimode Fiber
Table 3 provides a brief overview and naming conventions of various MMF types deployed in the field.
For additional information about optical fibers, refer to
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/white_paper_c11-463661.html
.
Table 3.
Types of MMF
Naming Convention
Core Size in Microns
Modal Bandwidth at 850 nm (MHz*km)
OFL Modal Bandwidth at 1310 nm (MHz*km)
FDDI-grade
62.5
160
500
OM1
62.5
200
500
OM2
50
500
500
OM3
50
1500
500
Requirements for Gigabit Ethernet Transmissions
The requirement for MCP is specified only for 1000BASE-LX/LH transceivers transmitting in the 1300-nm window
and in applications over MMF. MCP should never be used in 1000BASE-SX links in the 850-nm window.
MCP is required for 1000BASE-LX/LH applications over FDDI-grade, OM1, and OM2 fiber types. MCP should never
be used for applications over OM3, also known as “laser-optimized fiber.”
Notes:
1. Some customers might be tempted to connect 1000BASE-LX/LH devices over short reaches of MMF jumper
cables without MCP cables. There is a risk associated to this type of nonstandard deployment, especially when
the jumper cable is an FDDI-grade or OM1 type. In such case the power coupled directly into a 62.5-micron fiber
could be as high as a few dBm (typically 5 to 6 dBm), and if the jumper cable is short, the adjacent receiver will
be saturated, causing high bit error rate, and eventually irreversibly damaged. We recommend the use of MCP,
but if the customer remains reluctant to the deployment of MCP, a 5-dB attenuator for 1300nm should be used
and plugged at the transmitter of the optical module on each side of the link.
2. Another alternative for short reaches within the same location is to use a single-mode patch cable. There will be
no saturation over single-mode fiber.
Requirements for 10 Gigabit Ethernet Transmissions
The requirement for MCP is specified only for 10GBASE-LX4 and 10GBASE-LRM transceivers transmitting in the
1300-nm window and in applications over MMF. MCP should never be used in 10GBASE-SR links in the 850-nm
window.
MCP is required for 10GBASE-LX4 and 10GBASE-LRM applications over FDDI-grade, OM1, and OM2 fiber types.
MCP should never be used for applications over OM3, also known as “laser-optimized fiber.”