T7256 Agere Systems, T7256 Datasheet

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T7256

Manufacturer Part Number
T7256
Description
(T7234 - T7256) Compliance
Manufacturer
Agere Systems
Datasheet

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November 1998
(Refer to the T7234, T7237, and T7256 ISDN transceiver data sheets.)
Telecommunication Standard
The European Telecommunications Standards Institute (ETSI) has identified a change in the requirement of
the power spectral density (PSD) for Basic Rate Interface ISDN.
Section A.12.4, Power Spectral Density, of ETSI TS080 states the following:
The existing SCNT1 family (T7234A, T7237A, and T7256A) of U-interface transceivers fully comply with this
standard.
Conformance to the above requirement has been fully verified, and test reports are available upon request.
The upper boundary of the power spectral density of the transmitted signal shall be as shown in Figure 1,
below.
Measurements to verify compliance with this requirement are to use a noise power bandwidth of 1.0 kHz.
Systems deployed before January 1, 2000 do not have to meet this PSD requirement but shall meet the PSD
requirements as defined in ETR 080 edition 2. It is, however, expected that these systems will also meet the
PSD requirements of TS080 edition 3. Some narrowband violations could occur and should be tolerated.
Figure 1. Upper Boundary of Power Spectral Density from NT1 and LT
–100
–110
–120
–130
–140
–20
–30
–40
–50
–60
–70
–80
–90
0.001
Compliance with the New ETSI PSD Requirement
0.010
0.050
0.100
0.315
f (MHz)
1.000
1.000
5.000
T7234, T7237, and T7256
10.000
30.000
100.000
5-7388F

Related parts for T7256

T7256 Summary of contents

Page 1

... Figure 1. Upper Boundary of Power Spectral Density from NT1 and LT The existing SCNT1 family (T7234A, T7237A, and T7256A) of U-interface transceivers fully comply with this standard. Conformance to the above requirement has been fully verified, and test reports are available upon request. ...

Page 2

For additional information, contact your Microelectronics Group Account Manager or the following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA ...

Page 3

... Advisory July 1998 (Refer to the T7234, T7237, and T7256 ISDN transceiver data sheets.) The Technology and Telecommunications Standard sections below denote the differences between the T7234, T7237, and T7256 and the T7234A, T7237A, and T7256A. Technology The T-7234- - -ML, T-7237- - -ML, and T-7256- - -ML2 are 0.9 µm CMOS technology devices. ...

Page 4

... Application Circuit Please change the value of capacitor C15 from 0.1 µF to 1.0 µF in Figure 11 of the T7234 data sheet, Figure 17 of the T7237 data sheet, and Figure 20 of the T7256 data sheet. The following schematic shows the correct value (1.0 µF) for C15. MLT CIRCUIT ...

Page 5

Data Sheet February 1998 Features U- to S/T-interface conversion for ISDN basic rate (2B+D) systems — Integrated U- and S/T-interfaces — Operates in stand-alone mode to provide U- and S/T-interface activation, control, and mainte- nance functions — Automatic embedded operations ...

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T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Contents Features ....................................................................................................................................................................1 Description ................................................................................................................................................................1 Pin Information ..........................................................................................................................................................4 Functional Overview ..................................................................................................................................................8 U-Interface Frame Structure ......................................................................................................................................8 Bit Assignments .................................................................................................................................................9 S/T-Interface Frame Structure..................................................................................................................................10 U-Interface Description............................................................................................................................................12 S/T-Interface Description .........................................................................................................................................13 Loopbacks ...............................................................................................................................................................14 STLED Description ..................................................................................................................................................15 eoc State Machine ...

Page 7

February 1998 Figures Figure 1. Block Diagram ......................................................................................................................................... 4 Figure 2. Pin Diagram............................................................................................................................................. 4 Figure 3. U-Interface Frame and Superframe ........................................................................................................ 8 Figure 4. U-Interface Superframe Bit Groups......................................................................................................... 9 Figure 5. Frame Structures of NT and TE Frames ............................................................................................... 10 ...

Page 8

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Description (continued) 4-WIRE S/T-INTERFACE S/T- TRANS- CEIVER Pin Information ACTMODE SYN8K_CTL Note: Pin labels shown in bold (pins 11, 12, and 15) represent chip configuration controls that are sampled on the rising edge of ...

Page 9

February 1998 Pin Information (continued) Table 1. Pin Descriptions Pin Symbol Type* 1, 10, GND — OPTOIN I 3 STLED O 4 SYN8K/LBIND — DDD 6 ILOSS I 7 FTE ...

Page 10

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Pin Information (continued) Table 1. Pin Descriptions (continued) Pin Symbol Type* 8 PS2E d Power Status #2. This is an input for the PS2 bit in transmit U-interface data I stream. If the PS2E ...

Page 11

February 1998 Pin Information (continued) Table 1. Pin Description (continued) Pin Symbol Type* 25, 34, GND — Analog Ground. Ground leads for analog circuitry RNR I Receive Negative Rail for S/T-Interface. Negative input of S/T-interface analog ...

Page 12

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Functional Overview The T7234 device provides two interfaces for informa- tion transfer: the U-interface, the S/T-interface. The ANSI maintenance controller can operate in fully automatic or in fully manual mode. In automatic mode, the ...

Page 13

February 1998 U-Interface Frame Structure Bit # 1—18 19—234 Frame # Sync 12(2B+D) 1 ISW 2B Bit Assignments Table 2. U-Interface Bit Assignment Bit # 1—18 19—234 Frame # Sync 12(2B+D) 1 ...

Page 14

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver S/T-Interface Frame Structure The S/T-interface transfers its subscriber line 2B+D information as a 192 kbits/s full-duplex signal grouped into frames of 48 bits with a period of 250 s, as speci- fied in the ...

Page 15

February 1998 S/T-Interface Frame Structure In the TE-to-NT direction least four of five frames, this second violation occurs within 13 bits of the F bit. If this coding algorithm is not maintained, the receiver loses synchronization, but the ...

Page 16

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver U-Interface Description At the U-interface, the T7234 conforms to ANSI T1.601 and ETSI ETR 080 when used with the proper line interface circuitry. The T7234 Reference Circuit description in the Application Briefs section of ...

Page 17

February 1998 S/T-Interface Description At the S/T-interface, the 4-wire line transceiver meets the ANSI T1.605 standard, ITU-T I.430 recommenda- tion, and ETSI ETS 300 012 when used with the proper line interface circuitry. Refer to the March 1996, T7903 ISA ...

Page 18

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Loopbacks The figure below shows the Layer-1 loopbacks that are defined in ITU-T I.430, Appendix I and ANSI Speci- fication T1.605, Appendix G. A complete discussion of these loopbacks is presented in ITU-T I.430, ...

Page 19

February 1998 STLED Description The STLED pin is used to drive an LED and provides a visual indication of the current state of the T7234. The STLED control is typically configured to illuminate the LED when STLED is LOW. This ...

Page 20

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver STLED Description (continued) STLED = OFF STLED = 8 Hz STLED = START RESET YES PIN LOW? NO RESET = 0, QUIET MODE = ACTIVE, OR ILOSS MODE = ACTIVE NO ...

Page 21

February 1998 eoc State Machine Description The following list shows the eight eoc states defined in ANSI T1.601 and ETSI ETR 080. The bit pattern below represents the state of U-interface overhead bits eoci1—eoci8, respectively (see Table 2). 01010000—Operate 2B+D ...

Page 22

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Application Briefs T7234 Reference Circuit A reference circuit illustrating the T7234 in a stand- alone NT1 application is shown in Figures 11 and 12. This depicts a complete stand-alone NT1 design with the exception ...

Page 23

February 1998 Application Briefs (continued) T7234 Reference Circuit (continued) Figure 11. T7234 Stand-Alone Reference Circuit-A Lucent Technologies Inc. T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver SMP100-140 VRCM GND 28 A RPR 40 GND 27 A RNR DDA GND ...

Page 24

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Application Briefs (continued) T7234 Reference Circuit (continued) R16 R20 TPR 75 46 VR3 D5 D9 R17 R21 TNR 75 46.4 R18 R22 RPR 10 k 46.4 D6 D10 D2 D3 VR4 C17 ...

Page 25

February 1998 Application Briefs (continued) T7234 Reference Circuit (continued) Table 5. T7234 Reference Schematic Parts List Reference Designator C[1—4, 7, Ceramic Chip Capacitor, 0. X7R 10, 11] C5 Tantalum Chip Capacitor, 1 ...

Page 26

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Application Briefs (continued) T7234 Reference Circuit (continued) Table 5. T7234 Reference Schematic Parts List (continued) Reference Description Designator R[14, 15] SMC Resistor, 1 R[16, 17] SMC Resistor ...

Page 27

February 1998 Application Briefs (continued) T7234 Reference Circuit (continued) Table 5. T7234 Reference Schematic Parts List (continued) Reference Description Designator VR1 Transient Voltage Suppressor VR2 Transient Voltage Suppressor VR[3,4] Transient Voltage Suppressor, 6 15.36 Crystal 1. Kemet is ...

Page 28

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent or latent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied ...

Page 29

February 1998 Electrical Characteristics All characteristics are for a 15.36 MHz crystal, 135 5%, GND = 0 V, and output capacitance = 50 pF. DD Power Consumption Table 7. Power Consumption Parameter Power Consumption Power Consumption ...

Page 30

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Electrical Characteristics S/T-Interface Receiver Common-Mode Rejection Table 9. S/T-Interface Receiver Common-Mode Rejection Parameter Common-mode Rejection (at device pins) Crystal Characteristics Table 10. Fundamental Mode Crystal Characteristics These are the characteristics of a parallel resonant ...

Page 31

February 1998 Timing Characteristics Table 12. RESET Timing Parameter tRSLFL, tFLRSH RESET Setup and Hold Time tRSLRSH RESET Low Time: From Idle Mode or Normal Operation From Power-on SYN8K RESET Switching Test Input/Output Waveform 2.4 V 0.4 V Propagation Delay ...

Page 32

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Outline Diagram 44-Pin PLCC Dimensions are in millimeters. PIN #1 IDENTIFIER Note: The dimensions in this outline diagram are intended for informational purposes only. For detailed schematics to assist your ...

Page 33

February 1998 Questions and Answers Introduction This section is intended to answer questions that may arise when using the T7234 Single-Chip NT1 Trans- ceiver. The questions and answers are divided into three cate- gories: U-interface, S/T-interface, and miscellaneous. U-Interface Q1: ...

Page 34

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers U-Interface (continued) A9: (continued) This statement could be interpreted to mean that a protector such as VR2 in Figure 11 should not trip if subjected to a voltage of that amplitude. ...

Page 35

February 1998 Questions and Answers U-Interface (continued) Q12 planning on using a Raychem PTC (p/n TR600-150) on the U-interface of the T7234 as shown in Figure 11. The device is rated at 6 — ...

Page 36

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers U-Interface (continued) A12: (continued desirable to express the return loss in terms of im- pedance bounds, since an impedance measurement is relatively simple to make. From the above equation, ...

Page 37

February 1998 Questions and Answers U-Interface (continued) Q14: Where can information be obtained on lightning and surge protection requirements for 2B1Q products? A14: Requirements vary among applications and between countries. ANSI T1.601, Appendix B, provides a list of applicable specifications ...

Page 38

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers U-Interface (continued) A16: (continued transceiver can operate over Loop #1 error- free, it should have adequate range to meet all the other loops specified in T1.601. Loop #1 has ...

Page 39

February 1998 Questions and Answers U-Interface (continued) Q19: I need a way to generate a scrambled 2B1Q data stream from the T7234 for test purposes (e.g., ANSI T1.601 Section 5.3.2.2, Total Power and Section 7.2, Longitudinal Output Voltage). How can ...

Page 40

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers U-Interface (continued) Q27: What is the value of the ANSI T1.601 cso and nib bits in the 2B1Q frame? A27: cso and nib are fixed at 0 and 1, respectively, by ...

Page 41

February 1998 Questions and Answers S/T-Interface (continued) Q32: I notice that the application note entitled Design an S/T Line Interface Circuitry Using the T7250C/ T7259 recommends relays on both the transmit- ter and receiver outputs that disconnect the device when ...

Page 42

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers S/T-Interface (continued) A34: (continued) T7250C: The line interface transformer has a turns ratio of 2.5, and the transmitter drives a line-side load Reflecting this imped- ance to the ...

Page 43

February 1998 Questions and Answers S/T-Interface (continued) A34: (continued) T7234 Transmit to T7903/T7250C Receive a) Transmitter Load: The T7234 S/T line interface transformer has a turns ratio of 2.5, and the transmitter drives a line-side load Reflecting ...

Page 44

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers S/T-Interface (continued) A34: (continued) T7903/T7250C Transmit to T7234 Receive a) Transmitter Load use the same S/T-transmitter line inter- face circuit as in the normal (stand-alone TE) case, the transmitter ...

Page 45

February 1998 Questions and Answers S/T-Interface (continued) A34: (continued) T7903: In this case, the T7234 transmitter is driving into a transformer with a turns ratio of 2.0. The pulse amplitude that the transmitter must generate on the device side of ...

Page 46

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers S/T-Interface (continued) A34: (continued) T7234 75 TPR TNR 75 RPR D10 D7 D8 RNR 10 k T7903 10 NPx_PT ...

Page 47

February 1998 Questions and Answers S/T-Interface (continued) A34: (continued) T7250C 10 TPR TNR 10 RPR D10 D7 D8 RNR Refer to the T7250 data sheet, Figure F-10 for ...

Page 48

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers S/T-Interface (continued) A34: (continued) T7903 NPx_PT NPx_NT NPx_PR NPx_PT Figure 20. T7903 to T7234 Direct-Connect Scheme T7250C TPR TNR RPR RNR Figure 21. T7250C to T7234 Direct-Connect Scheme 44 (continued) 249 ...

Page 49

February 1998 Questions and Answers S/T-Interface (continued) A34: (continued T7903 10 NPx_PT NPx_NT 10 T7234 TPR 143 TNR 143 Refer to the T7903 data sheet, Figure F-10 for an example of ...

Page 50

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers S/T-Interface (continued) A34: (continued T7250C 10 TPR TNR 10 T7234 TPR 75 TNR D10 Refer to the T7250 data sheet, ...

Page 51

February 1998 Questions and Answers S/T-Interface (continued) Q35: In the Analog Interface section of the S/T-inter- face description in the data sheet, where does the value of 0 ms—3.1 ms maximum differential delay in adaptive timing mode come from? A35: ...

Page 52

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers Miscellaneous (continued) Q44: Is there a recommended method for powering the T7234? For example desirable to separate the power supplies, etc.? A44: The T7234 is not extremely sensitive to ...

Page 53

February 1998 Questions and Answers Miscellaneous (continued) A47: (continued) Therefore apparent that the conditions under which power is measured must be clearly specified. The methods Lucent has used to evaluate typical and worst-case power consumption are based on ...

Page 54

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Questions and Answers Miscellaneous (continued) Q48: What would cause the STLED indicator to flash sporadically rate? A48: If the T7234 S/T-interface is operating over a long loop that is outside ...

Page 55

February 1998 Glossary ACTMODE/INT: Act bit mode, serial interface microprocessor interrupt. ACTR: Receive activation (register CFR1, bit 0). ACTSC: Activation/deactivation state change on U-interface (register UIR0, bit 1). ACTSCM: Activation/deactivation state change on U-interface interrupt mask (register UIR1, bit 1). ...

Page 56

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Glossary (continued) ERC1: eoc state machine control— information register. ESD: Electrostatic discharge. ETSI: European Telecommunications Standards Institute. FEBE: Far-end block error (register CFR1, bit 5). FSC[2:0]: Frame strobe (FS) control, (register TDR0, bits 2—0). ...

Page 57

February 1998 Glossary (continued) OUSCM: Other U-interface state change mask (register UIR1, bit 3). PS1: Power status #1 (register GR1, bit 2). PS1E/TDMDO: Power status #1, TDM clock. PS2: Power status #2 (register GR1, bit 1). PS2E/TDMCLK: Power status #2, ...

Page 58

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver Glossary (continued) SXB1[1:0]: S/T-interface transmit path source for B1 channel (register DFR0, bits 5—4). SXB2[1:0]: S/T-interface transmit path source for B2 channel (register DFR0, bits 7—6). SXD: S/T-interface transmit path source for D channel ...

Page 59

February 1998 Standards Documentation Telecommunication technical standards and reference documentation may be obtained from the following organizations: ANSI (U.S.A.) American National Standards Institute (ANSI) 11 West 42nd Street New York, New York 10036 Tel: 212-642-4900 FAX: 212-302-1286 Lucent Technologies Publications ...

Page 60

For additional information, contact your Microelectronics Group Account Manager or the following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com U.S.A.: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: ...

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