Cisco ONS 15454 DWDM Reference Manual

9-15
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 9 Node Reference
9.1.5 Anti-ASE Node
Figure 9-14 ROADM Optical Signal Flow Example
9.1.5 Anti-ASE Node
In a mesh ring network, the ONS 15454 requires a node configuration that prevents ASE accumulation
and lasing. An anti-ASE node can be created by configuring a hub node or an OADM node with some
modifications. No channels can travel through the express path, but they can be demultiplexed and
dropped at the channel level on one side and added and multiplexed on the other side.
The hub node is the preferred node configuration when some channels are connected in pass-through
mode. For rings that require a limited number of channels, combine AD-xB-xx.x and 4MD-xx.x cards,
or cascade AD-xC-xx.x cards. See Figure 9-8 on page 9-10.
Figure 9-15 shows an anti-ASE node that uses all wavelengths in the pass-through mode. Use
Cisco TransportPlanner to determine the best configuration for anti-ASE nodes.
1 The OSC-CSM receives the optical signal. It separates the optical service channel from the optical payload and sends the
payload to the OPT-PRE module.
2 The OPT-PRE compensates for chromatic dispersion, amplifies the optical payload, and sends it to the 32WSS or
40-WSS-C/40-WSS-CE.
3 The 32WSS or 40-WSS-C/40-WSS-CE splits the signal into two components. The 80 percent component is sent to the
DROP-TX port and the 20 percent component is sent to the EXP-TX port.
4 The drop component goes to the 32DMX card or 40-DMX-C/40-DMX-CE card where it is demultiplexed and dropped.
5 The express wavelength aggregate signal goes to the 32WSS or 40-WSS-C/40-WSS-CE on the other side where it is
demultiplexed. Channels are stopped or forwarded based upon their switch states. Forwarded wavelengths are merged
with those coming from the ADD path and sent to the OSC-CSM module.
6 The OSC-CSM combines the multiplexed payload with the OSC and sends the signal out the transmission line.
32-ch
demux
Side B
OSC-CSM
115228
Side A
OSC-CSM
OSC
Side B
32WSS
Side A
32WSS
80/20
Side B
32DMX
Add
Add
Drop
2 slots
1 slot
Side B
OPT-PRE
Side B
Line
Side A
OPT-PRE
Side A
Line
32-ch
demux
Side A
32DMX
Drop
1 slot
32R_OAM
80/20
2 slots
32R_OAM
1
1
2
2
3
3
5
5
6
6
4
4
OSC

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