The 1830 VWM device can be used in point-to-point or ring deployments to multiplex multiple CWDM/DWDM channels over a single fiber. Either the existing fiber is reused or a single fiber is used to meet the increasing demand for service bandwidth. Up to 8 fixed CWDM channels are multiplexed over a single fiber using this unit.
The following figure shows 5 CWDM channels that are multiplexed over a single fiber.
There are two types of ring locations. One is a channel termination location, with the 1830 PSS-32 that optically terminates all the channels using either the 4-channel or the 8-channel termination module. The second location is the intermediate OADM sites with the 7210 SAS. These sites use the CWDM passive units to add or drop a channel in both directions (east and west), for the node to process traffic. Additionally, these sites provide express lanes for all other channels (that is, those not processed locally by the node). The 1830 VWM provides an option to add or drop up to 1, 2, 4 channels of fixed wavelength for local processing by the node.