Attaching The Mode-Conditioning Patch Cord - Cisco 7301 Installation And Configuration Manual
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Chapter 2
Rack-Mounting, Tabletop Installation, and Cabling
Figure 2-13
1
1
2
3
Remove the plug from the SFP GBIC module so that you can insert the cables. Keep the plug for use
Step 1
should you ever disconnect the optical fiber cables.
Warning
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into
beams or view directly with optical instruments. Statement 1051
Attach the appropriate optical fiber cable directly to the SFP GBIC module. You can use either simplex
Step 2
or duplex connectors for most devices.
being installed in SFP GBIC slot 0/1.)
•
•
A mode-conditioning patch cord can be used with the GLC-LH-SM to allow reliable laser transmission
between the single-mode laser source on the SFP GBIC module and a multimode optical fiber cable. For
installation instructions, see the
Attaching the Mode-Conditioning Patch Cord
A mode-conditioning patch cord can be used with the GLC-LH-SM to allow reliable laser transmission
between the single-mode laser source on the SFP GBIC and a multimode optical fiber cable.
When an unconditioned laser source designed for operation on single-mode optical fiber is directly
coupled to a multimode optical fiber cable, an effect known as differential mode delay (DMD) might
result in a degradation of the modal bandwidth of the optical fiber cable.
This degradation results in a decrease in the link span (the distance between a transmitter and a receiver)
that can be supported reliably. The effect of DMD can be overcome by conditioning the launch
characteristics of a laser source. A practical means of performing this conditioning is to use a device
called a mode-conditioning patch cord.
OL-5418-07
SFP GBIC Port Connections
4
AB IT ET HE
RN ET 0/ 0
G IG AB IT ET
LI NK
RJ 45 EN
TX
G BI C
RX
C I S C O 7
4 0 0
C IS C O 74
SE R IE S
11
2
3
To external 1000BASEX network
Duplex connector (TX and RX)
SFP GBIC module
For simplex connectors, two cables are required, one cable for transmit (TX) and a second cable for
receive (RX).
For duplex connectors, only one cable that has both TX and RX connectors is required.
6
5
HE RN ET 0/
1
G IG AB IT ET
LI NK
HE RN ET 0/
2
RJ 45 EN
TX
G BI C
RX
LI NK
AU X
CO NS O LE
TX
G BI C
RX
4
Gigabit Ethernet SFP GBIC port 0/1
5
TX (SFP GBIC port 0/1)
6
RX (SFP GBIC port 0/1)
(Figure 2-13
shows a SFP GBIC module with a duplex connector
"Attaching the Mode-Conditioning Patch Cord" section on page
Cisco 7301 Installation and Configuration Guide
Connecting I/O Cables
CO
FL
2-19.
2-19
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