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Chapter 5 Connecting Optical Cables
Connecting Fiber Channel or Gigabit Ethernet to a High-Speed Transparent WCM
5-12
Cisco Metro 1500 Series Hardware Installation Guide
78-10588-03
Connecting Fiber Channel or Gigabit Ethernet to a
High-Speed Transparent WCM
When connecting a fiber channel or Gigabit Ethernet port to a high-speed
transparent WCM on the Cisco Metro 1500 series system, you must ensure that
the optical power levels from the fiber channel or Gigabit Ethernet transmitter do
not overdrive the local receiver (L/R) port on the WCM. To avoid an overdrive
condition, insert an optical attenuation of 5 dB between the fiber channel or
Gigabit Ethernet transmitter and the L/R port on the WCM. You can implement
this attenuation with either an attenuating single-mode patch cable assembly or an
attenuating coupler, which are described in the following sections.
Attenuating Single-Mode Patch Cable
An attenuating single-mode patch cable is a 9.84-ft (3 m) fiber-optic jumper cable
with a built-in attenuation of 5 db. (See Figure 5-8.)
Figure 5-8 Attenuating Single Mode Patch Cable Assembly
The attenuating single-mode patch cable assembly should contain Corning
SMF-28 or equivalent single-mode fiber.
Attenuating Coupler
As an alternative to the attenuating single-mode patch cable, you can use a 5-dB
attenuating coupler. (See Figure 5-9.)
Blue MiniSC (MUPC)
single-mode connector
Blue SC
single-mode connector
5-dB
Yellow jacket
SMF SMF
3 meters
(9.84 feet)
39362