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Chapter 61
Configuring SONET/SDH Interfaces
SONET/SDH Interfaces Overview
SONET/SDH Interfaces Overview on page 895
Configuring SONET/SDH Physical Interface Properties on page 896
Configuring the Media MTU on SONET/SDH Interfaces on page 928
Enabling Passive Monitoring on SONET/SDH Interfaces on page 929
Configuring the Clock Source on SONET/SDH Interfaces on page 930
Configuring Receive and Transmit Leaky Bucket Properties on SONET/SDH
Interfaces on page 931
Damping Interface Transitions on SONET/SDH Interfaces on page 932
Configuring Interface Encapsulation on SONET/SDH Interfaces on page 933
Example: Configuring SONET/SDH Interfaces on page 936
Configuring Aggregated SONET/SDH Interfaces on page 936
Synchronous Digital Hierarchy (SDH) is a CCITT standard for a hierarchy of optical
transmission rates. Synchronous Optical Network (SONET) is a USA standard that is
largely equivalent to SDH. Both are widely used methods for very high speed
transmission of voice and data signals across the numerous world-wide fiber-optic
networks.
SDH and SONET use light-emitting diodes or lasers to transmit a binary stream of
light-on and light-off sequences at a constant rate. At the far end optical sensors
convert the pulses of light back to electrical representations of the binary information.
In wavelength-division multiplexing (WDM), light at several different wavelengths
(colors to a human eye) is transmitted on the same fiber segment, greatly increasing
the throughput of each fiber cable.
In dense wavelength-division multiplexing (DWDM), many optical data streams at
different wavelengths are combined into one fiber.
The basic building block of the SONET/SDH hierarchy in the optical domain is an
OC1; in the electrical domain, it is an STS-1. An OC1 operates at 51.840 Mbps. OC3
operates at 155.520 Mbps.
A SONET/SDH stream can consist of discrete lower-rate traffic flows that have been
combined using time-division multiplexing (TDM) techniques. This method is useful,
SONET/SDH Interfaces Overview
895
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