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Chapter 1
Product Overview
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
Figure 1-2
interface (fibers, power, alarm contact, and management) that complies with international standards.
Table 1-3
Figure 1-2
78-14134-01, Release 1.0
shows the Cisco ONS 15501 front panel. The front panel provides an all-front access
explains the front panel features.
Cisco ONS 15501 Front Panel
3
INVISIBLE LASER RADIATION.
DO NOT VIEW DIRECTLY WITH
OPTICAL INSTRUMENTS.
CLASS 1M LASER PRODUCT.
1
2
5
7
RS-232
POWER
FAIL
LOS
Cisco ONS 15501
ALARM OUT
LAN
4
6
8
9
Cisco ONS 15501 Front Panel
10
-48V RET
-48V RET
11
11
DC connectors shown
with cover removed
Cisco ONS 15501 User Guide
1-7
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