ICs for Communications DuSLIC FAQs Frequently Asked Questions 11.99 DS 1 Revision History: Current Version: 11.99 Previous Version: Page (in previous Version) Page (in current Version) Subjects (major changes since last revision) For questions on technology, delivery and prices please contact the Semiconductor Group Offices in Germany or the Siemens Companies and Representatives worldwide: see our webpage at http://www.siemens.de/semiconductor/communication ABM(R), AOP(R), ARCOFI(R), ARCOFI(R)-BA, ARCOFI(R)-SP, DigiTape(R), EPIC(R)-1, EPIC(R) -S, ELIC(R), FALC(R)54, FALC(R)56, FALC(R)-E1, FALC(R)-LH, IDEC(R), IOM(R), IOM(R) -1, IOM(R) -2, IPAT(R)-2, ISAC(R)-P, ISAC(R)-S, ISAC(R)-S TE, ISAC(R)-P TE, ITAC(R) , IWE(R), MUSAC(R)-A, OCTAT(R)-P, QUAT (R)-S, SICAT(R), SICOFI(R), SICOFI(R) -2, SICOFI(R)-4, SICOFI(R)-4C, SLICOFI(R) are registered trademarks of Siemens AG. ACETM, ASMTM, ASPTM, POTSWIRETM, QuadFALC TM, SCOUTTM are trademarks of Siemens AG. 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DuSLIC FAQs General Questions Frequently Asked Questions for DuSLIC This FAQ is separated into several subchapters in order to ease the search for the right question. 1 General Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 2 Interfaces & Control of DuSLIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3 DC Feeding / AC Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 4 Ringing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 5 Auxiliary Features (DTMF, Caller-ID, TTX, ...) . . . . . . . . . . . . . . . . . . . . . .9 6 External Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 7 Tooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 1 1. General Questions What is the DuSLIC The DuSLIC is a dual channel codec-SLIC combination consisting out of a two-channel codec filter with additional features (like DTMF recognition, Caller-ID transmission, Line-Echo-Canceller) and two single-channel ringing-SLIC devices. The DuSLIC is a family with a variety of different SLICs that give the most benefit for the different applications. 2. What's the advantage to a combo - SLIC solution? The major advantages compared to a standard combo solution are: - high integration factor (Ringing, DTMF, Caller-ID, TTX, Feeding, ...) - "one design for all countries" due to software programming of all parameters - excellent transmission performance (also for modem V.34 and V.90) - integrated test and diagnosis functions IDTF allow line testing - PBX support with 3-party conferencing and message-waiting-lamp support - cheap protection possible 3. What features are handled by the DuSLIC? - Internal unbalanced/balanced ringing capability up to 85 Vrms - Programmable teletax (TTX) generation - Programmable battery feed with capability for driving longer loops - Fully programmable dual-channel codec Frequently Asked Questions 3 11.99 DuSLIC FAQs General Questions - Ground/loop start signaling - Polarity reversal - Integrated test and diagnosis functions - On-hook transmission - Integrated DTMF generator - Integrated DTMF decoder - Integrated caller ID (FSK) generator - Integrated fax/modem detection (universal tone detection) - Integrated Line Echo Cancellation unit - Optimized filter structure for modem transmission - Three-party conferencing (in PCM/C mode) - Message waiting lamp support (PBX) - Power optimized architecture - Power management capability (integrated battery switches) - 8 and 16 kHz PCM Transmission - Specification in accordance with ITU-T Recommendation Q.552 for Z-interface and applicable LSSGR 4. What different SLICs are provided for the DuSLIC? An overview of the different SLICs is available as "DuSLIC Chip Selection Guide". Here a short summary: - SLIC-E for central office, PBX systems and digital loop carrier systems (only balanced ringing) - SLIC-E2 as long-haul variant of the SLIC-E with increased DC feeding current and higher longitudinal balance - SLIC-P for power sensitive applications like NTs and PCM-x applications (balanced and unbalanced ringing) - SLIC-S only together with the SLICOFI-2S without EDSP (i.e. DTMF, LEC, CID, ...) features. - SLIC-S2 as long-haul variant of the SLIC-S with increased DC feeding current and higher longitudinal balance 5. Are the different SLICs pin-compatible? All SLICs have the same pinning. Although some pins are not used in the different SLIC types, they fit into the same PCB, if this PCB was designed to handle these differences (pins are internally not connected if unused). 6. Can I connect a combo codec to the SLIC-x? No that is not possible. The separation concept is different. Frequently Asked Questions 4 11.99 DuSLIC FAQs General Questions 7. Can I connect a standard SLIC to the SLICOFI-2? No that is not possible. The separation concept is different. 8. Why is the separation done between DuSLIC and SLIC-x as it has been done? In order to optimize the architecture it is better to have a low-voltage part and a high-voltage part. Therefore the SLICOFI handles all low-voltage part features, the SLIC-x works in the high voltage area. 9. What are the target applications? Target applications are all applications with POTS/SLIC interfaces. Different SLIC types target then the applications in more detail. 10. Why is the PBX market especially supported? Several features are dedicated for the PBX market: - all timeslots are programmable -> no switching matrix needed any more - DTMF recognition, Caller-ID and TTX supported - 3-party-conferencing - Message-waiting-lamp functionality supported - up to 8 MHz PCM clock allows easy connection of several DuSLICs - "one design for all countries" due to software programming of all parameters - two PCM highways 11. What is the main advantage for intelligent NT (NT-Plus, NTab) applications? Within the intelligent NT or also SDSL NT the following features allow an optimized solution: - high integration -> no external components like DTMF receiver, TTX generator or Caller-ID generator are needed - integrated balanced and unbalanced ringing - integrated line testing - very low power consumption and up to three internal battery switches - glueless interface - "one design for all countries" due to software programming of all parameters - excellent transmission performance (also for modem V.34 and V.90) - support of external ringing (ring-trip within DuSLIC) 12. What is the main advantage for PCM-x/Pairgain/Digital Loop Carrier/DAML systems? Within the PCM-x systems the following features allow an optimized solution: - integrated balanced and unbalanced ringing - integrated line testing Frequently Asked Questions 5 11.99 DuSLIC FAQs Interfaces & Control of DuSLIC - very low power consumption and up to three internal battery switches - glueless interface - "one design for all countries" due to software programming of all parameters - excellent transmission performance (also for modem V.34 and V.90) - support of external ringing (ring-trip within DuSLIC) 13. What is the main advantage for Terminal Adapters/SOHO Routers/Cable Modems? Within application with local power supply like ISDN terminal adapters, SOHO Routers or Cable Modems, the following features allow an optimized solution: - high integration -> no external components like DTMF receiver, TTX generator or Caller-ID generator are needed - integrated balanced and unbalanced ringing - glueless interface - "one design for all countries" due to software programming of all parameters - excellent transmission performance (also for modem V.34 and V.90) 14. How can I adapt the circuitry to my country specifications? A software is available that allows You to generate coefficients for your application, taking into account your external components (protection) and country specifications. 2 Interfaces & Control of DuSLIC 15. How can I control the device? The DuSLIC is controlled either via a serial controller interface (SCI) if operated in PCM mode, or via command/indication (C/I) commands and the monitor channel if operated in IOM mode. 16. What is the difference between PCM and IOM interface access? The DuSLIC provides two different possibilities to connect to other devices: PCM mode and IOM mode. The selection is done via pinstrapping. In PCM mode there are eight PCM lines (clock, framing, receive highway A and B, transmit highway A and B, driver output highway A and B) and five SCI (serial controller interface) lines (clock, receive, transmit, chipselect, interrupt) available. Via the PCM lines the DuSLIC is connected to other telecom devices and voice data is transmitted. Via the SCI interface the DuSLIC is controller. The PCM interface works from 256 kbit/s up to 4 Mbit/s either in single or double clocking mode). The SCI interface works between 0 and 8 MHz. Frequently Asked Questions 6 11.99 DuSLIC FAQs DC Feeding / AC Transmission If IOM is selected as operation mode, the DuSLIC only works in 2 Mbit/s mode. All control and voice data is handled by the IOM-2 interface. Via pinstrapping an IOM channel consisting of four timeslots is selected. In the first two timeslots the voice data will be put, in the second two timeslots commands and indications (C/I channel) control the DuSLIC, the monitor channel programs the DuSLIC. 17. Are the different SLICs pin-compatible? All SLICs have the same pinning. Although some pins are not used in the different SLIC types, they fit into the same PCB, if this PCB was designed to handle these differences (pins are internally not connected if unused). 18. How is an isolation between POTS and an data interface in an application possible? If an isolation between the POTS interface and some dataport connected to a PC is required (EN 60 950), isolation can be realized by using optocouplers. In IOM mode the 4 IOM lines have to be separated by 4 optocouplers (e.g. SFH6943-2). The supply voltage has also to be isolated. In PCM mode both PCM and SCI lines have to be isolated (9 lines). Nine optocouplers (e.g. 2 x SFH6943-2 and SFH6186-2) have to be used. The supply voltage has also to be isolated. 19. Is there any free input/output pin available in the DuSLIC? On the SLICOFI-2 four pins per channel can be programmed by software as input/ output. Debounce and interrupt handling can be programmed. Two of the four pins can be used also as analog measurement input. Two of the four pins can be used to directly drive relays. 20. To which devices does the DuSLIC connect together? The DuSLIC is able to connect to all devices using the PCM or IOM-2 interface using either double or single clocking mode. Due to the high flexibility (programming of the PCM interface behavior) of the interface, connections to all standard PCM, IOM-2, GCI, TDM interfaces can be achieved. 21. Is the DuSLIC able to work also under jittery environment? The DuSLIC has been designed to work also under jittery clock conditions. 3 22. DC Feeding / AC Transmission Which transmission specifications are fulfilled? All major specifications are fulfilled, like Q.552, G.712. 23. What modem performance can be achieved? With the DuSLIC it is possible to transfer up to 56kbaud. New filter structures that are very widely and flexibly programmable allow a very good modem performance. Frequently Asked Questions 7 11.99 DuSLIC FAQs Ringing 24. What is the idle channel noise? The idle channel noise of the DuSLIC without using the TTX generator is typically -76 dB; while using the TTX generator, it is typically -73 dB. 25. What Vbat voltage is minimum needed to provide a certain DC feeding voltage? An application note "DuSLIC Voltage and Power Dissipation Calculation" is available the shows all necessary calculations. 26. What is the accuracy of the programming of the feeding current? The DuSLIC itself provides an accuracy of the current programming of 2% (gain error). In addition the accuracy of the line resistance (typically 1%) has to be added for the overall accuracy. The offset errors can be calibrated within the DuSLIC. 27. What is the power consumption of the DuSLIC? An application note "DuSLIC Voltage and Power Dissipation Calculation" is available the shows all necessary calculations. 4 Ringing 28. What voltage has to be applied to VBATR or VHR to get a certain ringing voltage? An application note "DuSLIC Voltage and Power Dissipation Calculation" is available the shows all necessary calculations. 29. What kind of ringing is supplied? The SLIC-E provides balanced ringing up to 85 Vrms. The SLIC-P provides in addition up to 50 Vrms unbalanced ringing. The SLIC-S provides up to 45 Vrms balanced ringing only. 30. What is the power consumption of the DuSLIC? An application note "DuSLIC Voltage and Power Dissipation Calculation" is available the shows all necessary calculations. 31. What is the accuracy of the programming of the ringing voltage? The accuracy of the ringing voltage is 5 % under worst case conditions including the accuracy of external components. Frequently Asked Questions 8 11.99 DuSLIC FAQs Auxiliary Features (DTMF, Caller-ID, TTX, ...) 5 32. Auxiliary Features (DTMF, Caller-ID, TTX, ...) What auxiliary features are supported? The following features are summarized as auxiliary features or EDSP features: - DTMF recognition - Tone generation - Caller-ID generation - TTX generation - Line Echo Canceler - Line Testing - Three-party conferencing - Universal Tone Detector 33. What type of Caller-ID is supported? Two different modes of Caller-ID support are implemented. One is the high level framing mode where seizure and mark bits are generated automatically. The FSK (frequency shift key) signal according to V.23 and Bell 202 is generated automatically. The data is managed via a 48 bytes buffer. The second mode is the low level framing mode, where the protocol and framing information has to be handled manually. This allows to use the Caller-ID sender also for countries with different implementations. For countries with DTMF caller ID DTMF tone generation and polarity reversal is programmable. 34. What is the maximum programmable metering (TTX) pulse? The DuSLIC supports both 12 kHz and 16 kHz metering pulses. A notch filter in transmit direction is integrated. DuSLIC-E and DuSLIC-P support up to 2,5 Vrms amplitude, the DuSLIC-S only up to 1,2 Vrms. The amplitude and frequency is SW programmable. For turning on the TTX pulses, a soft switching is implemented. 35. What kind of line testing is supported by the DuSLIC? The DuSLIC has several possibilities to perform line testing. For that either DC feeding, ring signals, ramps, tones in the transmission bandwidth or 12/16 kHz signals can be generated. At the same time level meter blocks can be used to measure. The following measurements are supported: - line resistance - ringer capacity - ringing voltage - foreign voltages Frequently Asked Questions 9 11.99 DuSLIC FAQs External Circuitry - leakage currents - feeding current - transversal / longitudinal current - battery voltage - ... 36. How good is the DTMF receiver? There is a test report available showing the performance of the DTMF receiver. 37. What is the performance of the Line Echo Canceler (LEC)? The LEC is a high performance rate adaptive echo canceller with up to 8 ms echo time. The transhybrid filter can attenuate more than 50 dB. Freeze mode and modem detection is supported. 6 External Circuitry 38. How is the protection realized? The protection differs on the requirements depending on country specification, application and the type of DuSLIC used. Therefore an application note shows different implementations for protection. 7 Tooling 39. What tools are available? - coefficient calculation software Duslicos - evaluation board SMART 3265 with control SW - intelligent NT demonstration board SIPB 8x9x2 featuring DuSLIC - Intelligent NT for 4B3T demonstration board SIPB 8090-16 Frequently Asked Questions 10 11.99