Chapter 5 Connecting Optical Cables
Connecting Fiber Channel or Gigabit Ethernet to a High-Speed Transparent WCM
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
| | | | | | 3 meters | | | | | |
| | | | | | (9.84 feet) | | | | | | |
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| | | | | SMF | SMF | | | | |
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| | | | | | | 5-dB | | | | |
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Blue MiniSC (MUPC) | Yellow jacket | Blue SC |
single-mode connector | | | | | | single-mode connector |
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.)
| Cisco Metro 1500 Series Hardware Installation Guide |
5-12 | 78-10588-03 |
