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Maxim > Design Support > Technical Documents > Application Notes > Communications Circuits > APP 340
Maxim > Design Support > Technical Documents > Application Notes > T/E Carrier and Packetized > APP 340
Keywords: framers, SCTs, single chip transceiver, ETSI, ETS 300-011, remote alarm, framer, tranceiver,
SCT, E1 framers
APPLICATION NOTE 340
DS2153 Programming, ETS 300-011 Remote Alarm
Generation
May 15, 2001
Abstract: This application note is a guide for building software to control Remote Alarm generation in all
Dallas Semiconductor E1 Framers and Single Chip Transceivers (SCTs). The basis for Remote Alarm
generation is the European Telecommunications Standards Institute (ETSI) standard ETS 300-011. ETS
300-011 is intended for systems which incorporate an Integrated Services Digital Network (ISDN),
Primary rate user-network interface. The specification describes Layer 1 operation and test principles,
which includes but is not limited to Remote Alarm generation. Remote Alarm generation is important
because it is by the system for notification of a line fault. To ensure interoperability between many
different E1 systems, it is important that each system follows the same specifications. This application
note contains background information on ETS 300-011 and a complete software flow diagram, which
illustrates how to properly generate a Remote Alarm in accordance with the specification.
Introduction to ETS 300-011
The European Telecommunications Standards Institute, better known as ETSI, is a standards body that
operates throughout the European Union. Their goal is to produce the telecommunications standards that
will be used for decades to come throughout Europe and beyond. Further information on the ETSI
organization can be found on their website at www.etsi.org.
The ETS 300-011 specification is intended for designs with an Integrated Services Digital Network
(ISDN), Primary rate user-network interface. ETS 300-011 describes the Layer 1 specification and test
principles for the ISDN interface. One aspect of the ISDN interface is the use of the Remote Alarm for
notification of a line fault. This application note focuses on the use of the Remote Alarm and how to
implement it in software.
ETS 300-011 Software Loop Description
The flowchart in Figure 1 can be used to implement the Remote Alarm functions in Dallas
Semiconductor's singlechip transceivers or framers. It is based on the ETS 300-011 specification and
designed to guide the software development.
Software Initialization Sequence
The following seven initialization tasks need to be performed prior to the flow chart sequence.
1. Power Up All Necessary Hardware.
2. Reset All SCT or Framer Registers to 0x00.
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