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Introduction
The OC3port Plus constantly monitors the SONET/SDH framing structure to
detect errors. This chapter describes how to set up your OC3port Plus to test
STS-3c and STM-1 signals. It shows you how to monitor these signals and
describes the various results provided by the OC3port Plus about the transmitted
signals. Finally, this chapter describes the alarms that you can transmit. It shows
you how to generate an alarm and view information about received alarms.
Configuring the Framing Format
If your OC3port Plus has been factory configured and shipped to work on a
SONET OC3 STM-1 network, you have the ability to do testing that is compliant
with
Synchronous Digital Hierarchy (SDH)
major differences between SONET OC3 STS-3c and SDH STM-1 standards and
then shows you how to configure the framing format on the OC3port Plus so that
you can work with SDH-compliant equipment.
Differences between SONET OC3 STS-3c and SDH STM-1
The differences between SONET OC3 STS-3c and SDH STM-1 standards are
minimal. Both technologies operate at 155 Mbits per second. SONET OC3
networks use STS-3c frames. SDH networks, on the other hand, use STM-1
frames. ATM traffic is carried on both of these formats and the formats are nearly
identical.
Although the differences are minor, STS-3c frames can only be used on SONET
OC3 networks, and STM-1 frames can only be used on SDH networks. The
following information summarizes the differences between the SONET and SDH-
compliant networks:
•
To configure the OC3port Plus for compliance with SDH standards, you need
to change the framing format. When you choose STS as the framing format,
the OC3port Plus automatically sets the S-bits to "00" for SONET STS-3c
networks. When you choose STM as the framing format, the OC3port Plus
automatically sets the S-bits to "10" for the SDH STM-1 networks.
After you choose a framing format, you can (for diagnostic
purposes) override the S-bit settings used by the framing format.
To do this, see "Changing the S-Bit Values" later in this chapter
for information on how to do this.
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SONET/SDH Configuration and Testing
standards. This section describes the
Note
4
Introduction
4-3
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