Maxim > Design Support > Technical Documents > Application Notes > T/E Carrier and Packetized > APP 309
Keywords: T1, E1, T1/E1, single chip transceivers, SCT, framer, fractional, looped-timed, channel, port
APPLICATION NOTE 309
Interfacing to the Fractional T1 and E1
May 04, 2001
Abstract: This application note provides an example fractional T1 and E1 circuit design using Dallas
Semiconductor/Maxim Communications Products T1/E1 single chip transceivers (SCTs) and T1/E1
framers.
Introduction
This application note shows a "looped-timed" application where a Dallas framer or single-chip transceiver
(SCT) is configured for a fractional T1/E1 interface.
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 DS36528
DS26524
DS26522
DS26521
DS26519
DS26518
General Configuration
It is common for a T1/E1 carrier subscriber to not have the full T1/E1 rate of service, but a fractional T1
or E1 service, since the full bandwidth may not be needed or affordable. The circuit shown in Figure 1
shows an example of a fractional T1/E1 circuit design, where the application is "looped-timed" and
connected to a V.35/RS-449/S530 interface. In this figure, the transmit and receive FT1/E1 streams
occupy the same time slots. The DS2175 is our T1/CEPT Elastic Store IC and the XR-T8000 is the Exar
Clock Synchronizer/Adaptor for Communications IC. The idle registers on the Dallas framer/SCT can be
used to fill unused channels, and the used channels do not need to be contiguous. RCHBLK can be
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used with TCHBLK to allow up to three additional FT1/E1 ports. Reset should be activated after all the
clocks are stable.
Figure 1. Fractional T1/E1 to V.35 interface.
Conclusion
This application note has shown how to design our framers/SCTs for fractional T1/E1 in a "loop-timed"
application.
If you have further questions about fractional T1/E1, please contact the Telecommunication Applications
support team.
Dallas Framer/SCT Information
For more information about our framers/SCTs, please consult the data sheets available on our website at
www.maximintegrated.com/telecom.
Related Parts
DS21352
3.3V DS21352 and 5V DS21552 T1 Single Chip
Transceivers
DS21354
3.3V/5V E1 Single Chip Transceivers (SCT)
DS2141A
T1 Controller
DS2143
E1 Controller
DS21455
Quad T1/E1/J1 Transceivers
Free Samples
DS21458
Quad T1/E1/J1 Transceivers
Free Samples
DS2152
Enhanced T1 Single Chip Transceiver
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DS2154
Enhanced E1 Single Chip Transceiver
DS21552
3.3V DS21352 and 5V DS21552 T1 Single Chip
Transceivers
DS21554
3.3V/5V E1 Single Chip Transceivers (SCT)
Free Samples
DS21FF42
4 x 4 16 Channel T1 Framer / 4 x 3 12 Channel T1
Framer
DS21FF44
4x3 Twelve Channel E1 Framer / 4x4 Sixteen Channel E1
Framer
DS21FT42
4 x 4 16 Channel T1 Framer / 4 x 3 12 Channel T1
Framer
DS21FT44
4x3 Twelve Channel E1 Framer / 4x4 Sixteen Channel E1
Framer
Free Samples
DS21Q352
Quad T1/E1 Transceiver (3.3V, 5.0V)
DS21Q354
Quad T1/E1 Transceiver (3.3V, 5.0V)
DS21Q42
Enhanced Quad T1 Framer
DS21Q44
Enhanced Quad E1 Framer
DS21Q552
Quad T1/E1 Transceiver (3.3V, 5.0V)
DS21Q554
Quad T1/E1 Transceiver (3.3V, 5.0V)
DS26518
8-Port T1/E1/J1 Transceiver
Free Samples
DS26519
16-Port T1/E1/J1 Transceiver
Free Samples
DS26521
Single T1/E1/J1 Transceiver
Free Samples
DS26522
Dual T1/E1/J1 Transceiver
Free Samples
DS26524
Quad T1/E1/J1 Transceiver
Free Samples
DS26528
Octal T1/E1/J1 Transceiver
Free Samples
More Information
For Technical Support: http://www.maximintegrated.com/support
For Samples: http://www.maximintegrated.com/samples
Other Questions and Comments: http://www.maximintegrated.com/contact
Application Note 309: http://www.maximintegrated.com/an309
APPLICATION NOTE 309, AN309, AN 309, APP309, Appnote309, Appnote 309
© 2012 Maxim Integrated Products, Inc.
Additional Legal Notices: http://www.maximintegrated.com/legal
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