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Cisco ONS 15501 User Guide
78-14134-01, Release 1.0
Chapter 1 Product Overview
Cisco ONS 15501 Front Panel
Inserting attenuation devices such as VOAs (variable optical attenuators) between the OADM (optical
add/drop multiplexer) and the transmitter allows optical power management of individual channels. Per
band power management at the trunk line, between the OADM and the EDFA, is also an effective
method. The Cisco ONS 15501 is capable of supporting either approach, and its wide input range (-29
to 0 dBm) makes it an ideal amplifier for a broad array of ring network designs.
Adding or Dropping Wavelengths
Automatic gain control reacts to the adding or dropping of wavelengths in a network, without requiring
power equalization tuning. The fast response of the Cisco ONS 15501 reduces the impact of adding or
dropping channels, and prevents BER hits.
Adjusting to Span Loss Changes
It is typically necessary to adjust gain and attenuation values both for trunk attenuation and channel or
band power equalization.
Cisco ONS 15501 Front Panel
shows the Cisco ONS 15501 front panel. The front panel provides an all-front access
interface (fibers, power, alarm contact, and management) that complies with international standards.
explains the front panel features.
Figure 1-2
Cisco ONS 15501 Front Panel
POWER
ALARM OUT
Cisco ONS 15501
FAIL
LOS
-48V
RET
-48V
RET
LAN
RS-232
DC connectors shown
with cover removed
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68377
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INVISIBLE LASER RADIATION.
DO NOT VIEW DIRECTLY WITH
OPTICAL INSTRUMENTS.
CLASS 1M LASER PRODUCT.
