This chapter explains the
Tunable Dispersion Compensating Units (T-DCU) used in Cisco ONS 15454 dense
wavelength division multiplexing (DWDM) networks.
For card safety and compliance
information, refer to the
Regulatory Compliance and Safety Information for Cisco
NCS Platforms document.
unit compensates for chromatic dispersion (CD) of the transmission fiber. The
T-DCU provides two line cards with varied set of tunable wavelengths to
compensate for CD.
The T-DCU card provides a selectable set of
discrete negative chromatic dispersion values to compensate for chromatic
dispersion of the transmission line. The card operates over the entire C-band
(in the range of 1529.0 nm to 1562.5 nm) and monitors the optical power at the
input and the output ports. The two types of T-DCU line cards are:
TDC-CC (Coarse T-DCU)
TDC-FC (Fine T-DCU)
Each T-DCU card is marked
with a symbol that corresponds to a slot (or slots) on the
NCS shelf assembly. Cards should be installed in
slots that have the same symbols.