Nortel Networks OPTera Metro 3500 - Manual (Page 299)

Hardware feature descriptions 3-71
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
STS-12c, STS24c or STS-48c signals: one from the provisioned working
optical interface circuit pack and one from the switchmate optical interface
circuit pack. The network element selects the better of the two signals.
Protection of path failures on a single OC-48 optical interface completes in
60 ms, but protection of path failures on multiple OC-48 optical interfaces
completes in less than 200 ms.
OC-48 DWDM circuit pack
(See
Table 8-8 on page 8-15 in Part 2 of this guide for PEC codes)
The OC-48 DWDM circuit pack is provisioned in the same way as other
OC-48 circuit packs.
The OC-48 DWDM circuit pack and OMX are required to support DWDM
topologies for OPTera Metro 3500.
Note 1: There are four wavelengths (channels) in each band. Each OMX
accommodates one band. Combined, the 8 OMX’s can accommodate 32
wavelengths on a single fiber.
Note 2: The OPTera Metro OMX does not support OC-48 DWDM
1535.04 nm, OC-48 DWDM 1555.75 nm, OC-48 DWDM 1596.34 nm or
OC-48 DWDM 1578.69 nm wavelengths.
Note 3: Additional wavelengths for DWDM C-Band may be introduced in
the future.
Each OC-48 DWDM circuit pack corresponds to a specific wavelength of
light. The DWDM band and channel number are specified on the circuit pack
label. Variable optical attenuators (VOA) are required when the received
power level exceeds the received overload level, observed, for example, in
short fiber distances between nodes. For more information, see
Dense
wavelength division multiplexing (DWDM) on page 2-46 .
Section data communication channel (SDCC)
A DWDM OC-48 line carries a DCC channel that can be edited, provisioned,
and deprovisioned.
Note 1: The maximum number of simultaneous SDCC-provisionable
ports on an OPTera Metro 3500 shelf is 34 (the shelf must be equipped with
eight unprotected OC-3x4 circuit packs in slots 3 through 10, and a
protected pair of OC-48 DWDM circuit packs in slots 11 and 12).
Note 2: For Nortel Networks interworking and multi-vendor network
scenarios, DCC interoperability can be achieved with the appropriate
provisioning. See Optical Networks Data Communications Network
Planning Guide, NTR710AM.