363-206-285
Transmission and Synchronization Interfaces
5-12 Issue 3 June 2001
With 27-type OLIUs in the main slots, VT1.5 or STS-1 signals from the function
slots can be routed to either of the two OC-1 ring interfaces. The signal is
transmitted on both rotations of the ring. Standard SONET overhead is added on
each OC-1 interface transmitted by the 27-type OLIU. In the receive direction, the
27-type OLIU processes the SONET overhead, monitors the received signals (for
parity errors, loss of signal, line and path AIS, etc.), performs standard STS-1 or
VT1.5 path switching as required, and routes the signals to any function unit. In
both directions of transmission, the two OC-1 ring interfaces are handled
independently. Figure 5-7 is an example of this configuration.
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