Cisco ONS 15454 DWDM Reference Manual

10-10
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 10 Network Reference
10.4 Automatic Power Control
10.4 Automatic Power Control
The ONS 15454 automatic power control (APC) feature performs the following functions:
• Maintains constant per-channel power when desired or accidental changes to the number of channels
occur. Constant per-channel power increases optical network resilience.
• Compensates for optical network degradation (aging effects).
• Simplifies the installation and upgrade of DWDM optical networks by automatically calculating the
amplifier setpoints.
Note APC algorithms manage the optical parameters of the OPT-BST, OPT-PRE, OPT-AMP-17-C, 32DMX,
40-DMX-C, 40-DMX-CE, OPT-BST-L, OPT-AMP-L, OPT-AMP-C, and 32DMX-L cards.
Amplifier software uses a control gain loop with fast transient suppression to keep the channel power
constant regardless of any changes in the number of channels. Amplifiers monitor the changes to the
input power and change the output power proportionately according to the calculated gain setpoint. The
shelf controller software emulates the control output power loop to adjust for fiber degradation. To
perform this function, the TCC2/TCC2P needs to know the channel distribution, which is provided by a
signaling protocol, and the expected per-channel power, which you can provision. The TCC2/TCC2P
compares the actual amplifier output power with the expected amplifier output power and modifies the
setpoints if any discrepancies occur.
Table 10-1 Supported Topologies and Node Types
Number of Channels Fiber Topologies Node Types
32 channels SMF-28
1
E-LEAF
2
TW-RS
3
1. SMF-28 = single-mode fiber 28.
2. E-LEAF = enhanced large effective area fiber.
3. TW-RS = TrueWave reduced slope fiber.
Ring
Linear
Linear without OADM
Hub
Active OADM
Passive OADM
Terminal
Line
OSC regeneration
16 channels SMF-28 Ring
Linear
Linear without OADM
Hub
Active OADM
Passive OADM
Terminal
Line
OSC regeneration
8 channels SMF-28 Linear without OADM Terminal
Line

Cisco ONS 15454 DWDM Specifications

General

Chassis Type	DWDM
Form Factor	Rack-mountable
Slots	17
Storage Temperature	-40 to 158°F (-40 to 70°C)
Relative Humidity	5% to 95% non-condensing
Power Supply	AC or DC
Cooling	Internal fans
Operating Temperature	23 to 104°F (-5 to 40°C)
Altitude	0 to 6500 ft (0 to 1981 m)
Safety Compliance	EN 60950-1
EMI Compliance	FCC Part 15