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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
PM7346 S/UNITM
QJET
S/UNI-QJET
ANSWERS TO FREQUENTLY ASKED QUESTIONS REGARDING THE S/UNI-QJET
ISSUE 1: MARCH 1998
PMC-Sierra, Inc.
105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 604 .415.6000
PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
CONTENTS 1 2 3 4 REFERENCES......................................................................................... 1 GLOSSARY OF TERMS .......................................................................... 3 BACKGROUND AND OVERVIEW ........................................................... 4 ANSWERS TO FREQUENTLY ASKED QUESTIONS.............................. 5 Q1) Q2) Q3) ARE THERE ANY REFERENCE DESIGNS OR APPLICATION NOTES AVAILABLE FOR THE QJET?.......................................... 5 ARE THERE ANY SOFTWARE DRIVERS AVAILABLE FOR THE QJET? ........................................................................................... 5 THE QJET USES A 3.3 V SUPPLY AND 5 V BIAS. WHAT IS THE CORRECT POWER SUPPLY SEQUENCING FOR POWERING UP THE QJET? ................................................................................... 5 DO ALL THE CHANNELS OF THE QJET NEED TO BE CONFIGURED IDENTICALLY?..................................................... 5 ARE THERE ANY 3.3 V LINE INTERFACE UNITS AVAILABLE TO INTERFACE TO THE QJET?......................................................... 6 WHAT LIU DOES PMC-SIERRA RECOMMEND FOR DS3 AND E3 APPLICATIONS?........................................................................... 6 WHAT LIU DOES PMC-SIERRA RECOMMEND FOR J2 APPLICATIONS?........................................................................... 6 WHAT STANDARDS APPLY TO THE QJET? ................................ 6 WHAT BGA SOCKET IS RECOMMENDED FOR PROTOTYPING WITH THE QJET? ......................................................................... 6
Q4) Q5) Q6) Q7) Q8) Q9)
Q10) CAN THE QJET BE INTERCONNECTED WITH 5V DEVICES? .. 6 5 6 NOTES..................................................................................................... 7 CONTACTING PMC-SIERRA, INC. ......................................................... 8
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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
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REFERENCES ANSI T1.627 - 1993, "Broadband ISDN - ATM Layer Functionality and Specification". ANSI T1.107a - 1990, "Digital Hierarchy - Supplement to Formats Specifications (DS3 Format Applications)". ANSI T1.107 - 1995, "Digital Hierarchy - Formats Specifications". ANSI T1.646 - 1995, "Broadband ISDN - Physical Layer Specification for UserNetwork Interfaces Including DS1/ATM". ATM Forum - ATM User-Network Interface Specification, V3.1, October, 1995. ATM Forum - "UTOPIA, An ATM PHY Interface Specification, Level 2, Version 1", June, 1995. ATM Forum, 94-0406R5, "E3 (34,368 kbps) Physical Layer Interface", Dec. 21, 1994. ATM Forum, 95-1207R1, "DS3 Physical Layer Interface Specification", December 1995.. ATM Forum, af-phy-0029.000, "6,312 Kbps UNI Specification, Version 1.0", June 1995. Bell Communications Research, TA-TSY-000773 - "Local Access System Generic Requirements, Objectives, and Interface in Support of Switched Multi-megabit Data Service" Issue 2, March 1990 and Supplement 1, December 1990. ETS 300 269 - "Metropolitan Area Network Physical Layer Convergence Procedure for 2.048 Mbit/s", April 1994. ETS 300 270 - "Metropolitan Area Network Physical Layer Convergence Procedure for 34.368 Mbit/s", April 1994. ITU-T Recommendation O.151 - "Error Performance Measuring Equipment Operating at the Primary Rate and Above", October, 1992. ITU-T Recommendation I.432 - "B-ISDN User-Network Interface - Physical Layer Specification", 1993
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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
ITU-T Recommendation G.703 - "Physical/Electrical Characteristics of Hierarchical Digital Interfaces", 1991. ITU-T Recommendation G.704 - "General Aspects of Digital Transmission Systems; Terminal Equipments - Synchronous Frame Structures Used At 1544, 6312, 2048, 8488 and 44 736 kbit/s Hierarchical Levels", July, 1995. ITU-T Recommendation G.751 - CCITT Blue Book Fasc. III.4, "Digital Multiplex Equipments Operating at the Third Order Bit Rate of 34,368 kbit/s and the Fourth Order Bit Rate of 139,264 kbit/s and Using Positive Justification", 1988. ITU-T Draft Recommendation G.775 - "Loss of Signal (LOS) and Alarm Indication Signal (AIS) Defect Detection and Clearance Criteria", October 1993. ITU-T Recommendation G.804 - "ATM Cell Mapping into Plesiochronous Digital Hierarchy (PDH)", 1993. ITU-T Recommendation G.832 - "Transport of SDH Elements on PDH Networks: Frame and Multiplexing Structures", 1993. ITU-T Recommendation Q.921 - "ISDN User-Network Interface - Data Link Layer Specification", March, 1993. NTT Technical Reference, "NTT Technical Reference for High-Speed Digital Leased Circuit Services", 1991.
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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
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GLOSSARY OF TERMS ADM ATM Direct Mapping. This refers to the asynchronous mapping of ATM cells directly into the S/UNI-QJET DS3, E3, or J2 payload. A complete description of this mapping can be found in ITU-T G.804. Ball Grid Array. This term refers to a type of pack for ICs. The package is electrically connected to the circuit board via conductive balls arranged in a grid pattern on the underside of the package. The QJET device is packaged in a BGA. Digital Service Level 3. This term refers to a standardized format for digital signals which is comprised of seven DS2 signals asynchronously multiplexed plus overhead for a sum of 4760 bits sent at a 44.736 MHz bit rate. Note that the frame rate is not 8 kHz. Japanese Transmission Format Order 2. This is a generic term for a standardized format for digital signals comprised of 98 DS0s plus overhead for a sum of 789 bits repeated at an 8 kHz repetition rate for a total bandwidth of 6312 kbit/s. Physical Layer Convergence Protocol. This is a framing pattern and payload inserted asynchronously into the S/UNI-QJET DS3, E3, or J2 payload. The payload is filled with 53 byte ATM cells. PLCP is defined in IEEE 802.6. Transmission Format Order 3. This is a generic term that refers to transmission systems, interfaces and equipment that process DS3-formatted signals. Line Interface Unit. This refers to a device that takes digital signals (such as a T3) from a framer and electrically formats them for transmission (for instance, over a DS3).
BGA
DS3
J2
PLCP
T3
LIU
3
PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
3
BACKGROUND AND OVERVIEW PMC-Sierra's PM7346 S/UNI-QJET is a single chip quad ATM User Network Interface. The device has integrated J2, E3, and T3 framers that can be individually selected per channel. In addition, the framers can be bypassed to allow support of some arbitrary bit rate using an external framer. ATM functionality may also be bypassed so that the device may be used as a framer only. In order to help customers quickly find the answers to their questions, the following list of answers to frequently asked questions has been compiled. In this document, the term "QJET" will refer to the PM7346 S/UNI-QJET device.
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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
4 Q1) A1)
ANSWERS TO FREQUENTLY ASKED QUESTIONS Are there any reference designs or application notes available for the QJET? Yes. There are 2 application notes available for the QJET: * Comparison of PLPP S/UNI-PDH, and S/UNI-QJET register space, PMC, 961125. This document is intended as an aid to assist users of the PLPP and S/UNI-PDH in migration to the PM7346 S/UNI-QJET. S/UNI-QJET Technical Overview, PMC-971016. This document contains an overview of the QJET, with short, concise descriptions of the various functions of the QJET.
*
There is not currently a reference design available for the QJET. A paper reference design using the QJET and PM7364 FREEDM-8 will be available in June 1998. Customers should regularly check our website for new and updated application notes, reference designs, and datasheet errata. Q2) A2) Are there any software drivers available for the QJET? Yes. Software drivers for many of PMC-Sierra's components, including the QJET, are available by accessing the following web page: http://www.pmc-sierra.com/softwarefiles/default.asp The QJET uses a 3.3 V supply and 5 V bias. What is the correct power supply sequencing for powering up the QJET? Correct power supply sequencing is important to prevent accidental damage to the QJET. The voltage applied to VDD[1:28] must never exceed the voltage on BIAS by more than 0.7 V. Therefore, BIAS must be applied before VDD. In practice, this is easily implemented by placing a 1N5817M zener diode between the +5V supply and the +3.3V supply. This will ensure that BIAS is not lower than VDD by more than 0.7V. Do all the channels of the QJET need to be configured identically? No. Each of the four transmitters and four receivers can be configured independently.
Q3) A3)
Q4) A4)
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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
Q5) A5) Q6) A6)
Are there any 3.3 V Line interface units available to interface to the QJET? No. At the time this document was created, there were no 3.3V DS3, E3, or J2 LIUs available on the market. What LIU does PMC-Sierra recommend for DS3 and E3 applications? PMC-Sierra's evaluation board uses the TSC 78P7200 DS3/E3 LIU. This is the same LIU that was used on the D3MX reference design and S/UNI-PDH reference design. Because this is a 5V LIU, level conversion must take place between the outputs from the QJET and the inputs to the LIU. This is easily accomplished using a TTL Buffer. What LIU does PMC-Sierra recommend for J2 applications? PMC-Sierra's evaluation board uses the Transwitch TXC-02050 J2 LIU. Because this is 5V LIU, level conversion must take place between the outputs from the QJET and the inputs to the LIU. What standards apply to the QJET? A list of relevant standards can be found in the `references' section of the S/UNIQJET datasheet. What BGA socket is recommended for prototyping with the QJET? For testing and prototyping with the QJET, PMC-Sierra uses BGA sockets from: Yamaichi Electronics U.S.A., Inc. 2235 Zanker Road San Jose, CA 95131 U.S.A. Phone: (408) 456-0797 Fax: (408) 456-0799 Web site: http://www.yeu.com
Q7) A7)
Q8) A8) Q9) A9)
Q10) Can the QJET be interconnected with 5V devices? A10) The inputs to the QJET are 5V tolerant if BIAS is applied correctly. Therefore nothing need be done on QJET inputs to accommodate connection with 5V devices. QJET outputs are TTL level compatible. Care must be taken to ensure that the inputs to the 5V device are also TTL compatible.
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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
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NOTES
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PM7346 S/UNI-QJET
APPLICATION NOTE PMC-980319 ISSUE 1 SATURN QUAD USER NETWORK INTERFACE FOR J2/E3/T3
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CONTACTING PMC-SIERRA, INC. PMC-Sierra, Inc. 105-8555 Baxter Place Burnaby, BC Canada V5A 4V7 Tel: Fax: (604) 415-6000 (604) 415-6200 document@pmc-sierra.com info@pmc-sierra.com apps@pmc-sierra.com (604)415-4533 (604)415-6206 http://www.pmc-sierra.com
Document Information: Corporate Information: Application Information: Phone: Fax: Web Site:
None of the information contained in this document constitutes an express or implied warranty by PMC-Sierra, Inc. as to the sufficiency, fitness or suitability for a particular purpose of any such information or the fitness, or suitability for a particular purpose, merchantability, performance, compatibility with other parts or systems, of any of the products of PMC-Sierra, Inc., or any portion thereof, referred to in this document. PMC-Sierra, Inc. expressly disclaims all representations and warranties of any kind regarding the contents or use of the information, including, but not limited to, express and implied warranties of accuracy, completeness, merchantability, fitness for a particular use, or non-infringement. In no event will PMC-Sierra, Inc. be liable for any direct, indirect, special, incidental or consequential damages, including, but not limited to, lost profits, lost business or lost data resulting from any use of or reliance upon the information, whether or not PMC-Sierra, Inc. has been advised of the possibility of such damage. (c) 1998 PMC-Sierra, Inc. PMC-980319 Issue date: March 1998
PMC-Sierra, Inc.
105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 604 .415.6000

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