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Chapter 5 Connecting Optical Cables
Connecting Optical Isolators
5-14
Cisco Metro 1500 Series Hardware Installation Guide
78-10588-03
Caution When connecting Cisco Metro 1500 series systems, you must
adhere to the minimum remote link budget, as called out in
Table A-9 on page A-15. If you do not adhere to this minimum
budget, you might damage the receivers of the channel cards. This
damage can only be repaired at the factory and is not covered by the
warranty.
Connecting Optical Isolators
The Cisco Metro 1500 series optical isolator allows direct transmission from a
WCM over a remote (or trunk) fiber. The optical isolator enables a WCM to
bypass the multiplexer/demultiplexer (MUX/DMX) module in the system chassis.
By connecting the WCM to the optical isolator through fiber jumpers, you can
transmit directly over the remote fiber and obtain an additional 3 dB to 5 dB for
use in your optical budget.
The optical isolator minimizes optical back reflection. Optical back reflection is
common in fiber-based transmissions. Back reflection is a small amount of light
that is reflected back towards the transmitting optical component. The optical
isolator absorbs this reflected light so that the transmitting optical component
operates with minimal interference.
Installation Notes
The optical isolator is connected directly to a jumper that extends from the remote
connection of the WCM. The optical isolator sits between the WCM and the
remote (or trunk) fiber. (See Figure 5-10.)