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Maxim > Design Support > Technical Documents > Application Notes > T/E Carrier and Packetized > APP 334
Keywords: DS2172, DS21372, BERT, interface, t1 framers, single chip transceiver, SCT, E1 framers,
T1/E1, transceivers, bit error rate tester
APPLICATION NOTE 334
DS2172 BERT Interface to all Dallas Framers and
Transceivers
Oct 22, 2001
Abstract: How to interface the DS2172/DS21372 BERT to all Dallas Semiconductor family of T1/E1
framers and single-chip transceivers (SCTs).
Introduction
This application note shows a how to connect a Dallas BERT to a Dallas framer/single-chip transceiver
(SCT). This application note applies to the following products:
T1 Framers E1 Framers T1 SCTs E1 SCTs T1/E1 SCTs
DS2141 DS2143 DS2151 DS2153 DS2156
DS21Q41 DS21Q43 DS2152 DS2154 DS2155
DS21Q42 DS21Q44 DS21352 DS21354 DS21Q55
DS21FF42 DS21FF44 DS21552 DS21554 DS21455
DS21FT42 DS21FT44 DS21Q552 DS21Q554 DS21458
DS21Q352 DS21Q354
General Configuration
The circuit in Figure 1 describes a method of interfacing the DS2172/DS21372 bit error-rate tester
(BERT) to the Dallas Semiconductor family of T1/E1 framers and single-chip transceivers. This diagram
illustrates how the BERT can be used in a real system with the use of a multiplexer to determine
whether to put the system in test mode and use the BERT or to disable the BERT and send normal
data. The receive side of the DS2172/DS21372 can be connected directly to the receive-data stream of
the framer/SCT. The DS21372 is a 3.3V version of the DS2172.
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