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AL5068S Designer’s Guide
ISDN Socket Modem
AL5068S, AL5068S-3V Series
Designer’s Guide
RELEASED 13. SEPTEMBER 2006
No. AL5068S-E00-105 Altec Electronic AG Seite 1 / 25
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AL5068S Designer’s Guide Information provided by Altec Electronic AG is believed to be accurate and reliable. However, no responsibility is assumed by Altec Electronic for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Altec Electronic other than for circuitr
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AL5068S Designer’s Guide TABLE OF CONTENTS 1. INTRODUCTION................................................................................................. 5 1.1 Overview ...................................................................................................... 5 1.2 Product description....................................................................................... 5 1.3 Features ....................................................
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AL5068S Designer’s Guide List of Figures FIGURE 1-1. TYPICAL SERIAL BLOCK DIAGRAMS ................................................ 8 FIGURE 3.1 – SERIAL TTL PINOUT ....................................................................... 11 FIGURE 4-1. AL5068S SOCKET MODEM PHYSICAL DIMENSIONS ................... 22 List of Tables TABLE 3.1. SERIAL TTL SIGNALS..................................................................
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AL5068S Designer’s Guide 1. INTRODUCTION 1.1 Overview This Designer’s Guide describes the hardware for the following ISDN socket modems of Altec Electronic AG: AL5068S ISDN Socket Modem (5V Version) AL5068S-3V ISDN Socket Modem (3V Version) AL5068SI-3V ISDN Socket Modem (3V Version and IOM-2 bus) The description apply to all these isdn-modems with any differences between product families noted. Refer to Modem Firmware Release notes f
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AL5068S Designer’s Guide 1.3 Features • D-Channel Protocols: - DSS1 - X.31 (D-Channel) • B-Channel Protocols: - HDLC transparent - PPP async-sync (RFC1662) - X.75, - V.120 - V.110 - X.31, X.25 • ISDN S0 (I.430) Interface. • Several Dial Procedures: - AT commands - Auto Connect • X.3 PAD intergrated. • Command Interpreters with standard AT Commands • Trace Log Buffers. • Caller ID access control. • Firmware updatable
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AL5068S Designer’s Guide 2. TECHNICAL OVERVIEW 2.1 Dialing procedures The following dial procedures are supported: • AT commands • Auto-connect (Hotline call) • X.3 PAD 2.2 AT Commands Via AT-Commands you may control the ISDN connections and change the configuration of the AL5068S. ISDN specific configuration commands are supported. 2.2.1 Configuration Commands A range of parameters can be controlled by the configuration comm
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AL5068S Designer’s Guide 2.3 ISDN Protocols: ISDN Channel Protocols DSS1 D-channel protocols: X.31 D-channel HDLC (transparent) PPP sync-async (RFC 1662) X.75 B-channel protocols: Bit-transparent X.31 / X.25 V.110 V.120 2.4 Firmware Updates Firmware updates can always be affected via the local serial interface. 2.5 Supported Interfaces The major hardware signal interfaces of the AL5068S Series Socket Modem are illustra
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AL5068S Designer’s Guide Serial / Indicator Interface: DTE serial interface and indicator outputs are supported. Serial Interface: 8-line TTL logic serial interface to the DTE is supported. LED Interface: Four direct connect LED indicator outputs are supported The terminal (DTE) baudrate is determined automatically by the MCU firmware. It provides autobaud from 9600bps to 115200bps. The terminal (DTE) character format is fixed to 8 b
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AL5068S Designer’s Guide 3. HARDWARE INTERFACE 3.1 Interface Signals The ISDN Socket Modem pin assignments with DTE serial TTL interface are shown in Figure 3-1 and are listed in Table 3-1. 3.2 Signal Descriptions The Socket Modem interface signals are described in Table 3.2, 3.3 and 3.4. The digital electrical characteristics are listed in Table 3.5 The absolut maximum ratings are listed in Table 3-6.
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AL5068S Designer’s Guide Figure 3.1 – Serial TTL Pinout 1 64 64 TX + NC NC 2 63 63 TX - GND GND 3 62 62 RX + NC NC 4 61 61 RX - VCC VCC 6 TX + 7 RX + 8 RX - 9 TX - Top View AL5068S AL5068S2 47 47 FSC FSC 46 46 DCL DCL 45 45 DD DD 44 44 DU DU 43 43 NC NC 42 42 NC NC 24 41 24 41 RESET# GND RESET# GND 25 40 25 40 NC DTR# NC DTR# 26 39 26 39 GND DCD# GND DCD# 27 38 27 38 NC CTS# NC CTS# 28 37 28 37 NC DSR# NC DSR# 29 36 29 36 DC
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AL5068S Designer’s Guide Table 3.2 / Signal Descriptions I/O Label Signal Name Description Type VCC PWR +5 VDC / 3.3 VDC GND GND Ground. Connect to Digital Ground on the interface circuit. Modem Reset. The Active Low ~RESET input resets the Socket Modems logic and returns the AT command set to the original factory default ~RESET IC values and to “stored values” in NVRAM. ~RESET is connected to a built- in reset circuit on the Socket Modem
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AL5068S Designer’s Guide Table 3.4 / Serial Interface Signal Descriptions Request To Send (TTL Active Low). ~RTS is used to condition the local modem for data transmission and, during half-duplex operation, to control the direction of data transmission. On a full-duplex channel, RTS-OFF maintains the modem in a non- ~RTSTTL IA transmit mode. A non-transmit mode does not imply that the ISDN link have been terminated. RTS input ON causes the mode
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AL5068S Designer’s Guide Table 3.5 / Digital Electrical Characteristics Parameter Symbol Min. Typ. Max. Units Test Condition Input Voltage V Vdc I Type IA 0 - 5.5 5V tolerant Type IC 0 - 5.5 5V tolerant Output Voltage V Vdc I Type IA 0 - 3.3 Type IC 0 - 3.3 Input High Voltage V Vdc ICH Type IA 2.0 - - Type IC 2.0 - - Input Low Voltage V Vdc IL Type IA - - 0.8 Type
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AL5068S Designer’s Guide Table 3.6 / Absolute Maximum Ratings Parameter Symbol Min. Typ. Max. Units Test Condition Supply Voltage V Vdc DD 5V Version -0.5 - +7.0 3V Version -0.5 - +3.6 Input Voltage V Vdc IN +6.0 -0.5 - Nominal Supply Voltage V Vdc DD 5V Version 4.75 5.0 5.25 3V Version 3.10 3.3 3.50 Static Discharge Voltage V V ESD @ 25°C +/- 2500 -
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AL5068S Designer’s Guide 3.3 S INTERFACE 0 The ISDN Socket Modem has all the necessary circuitry for the S Interface 0 on-board, and is designed to meet the I.430 requirements of the European ISDN Network (S Bus). 0 The TX+/- and RX+/- signals must be provided from the RJ45 Telco jack to pins 1 to 4 of the Socket Modem. The TX+/- and RX+/- signal traces are to be no closer than 2.5mm (0.1”) from any other traces on the main board.
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AL5068S Designer’s Guide 3.4 External Reset Interface The AL5068S Socket Modem provides an external RESET input pin. This signal is used to force a reset procedure by providing low level during at least 100uS. This signal has to be considered as an emergency reset only. A reset procedure is already driven by an internal hardware during the power- up sequence. If no external reset is necessary this input can be left open. If used (emergency reset), it
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AL5068S Designer’s Guide 3.5 IOM-2 Bus Interface The AL5068SI-3V ISDN Modem supports 2 independent analog channels by adding 2 external PCM Codecs. This Codecs are connected to the IOM-2 bus on pins 44…47 of the socket modem. It is possible to setup 2 simultaneous links for both incoming and outgoing calls. The serial port remains in command state in this mode. The 2 external Codecs are marked with Codec A and Codec B. Each Codec (A or B) can ha
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AL5068S Designer’s Guide 4. DESIGN CONSIDERATIONS Good engineering practices must be adhered to when designing a printed circuit board (PCB) containing the AL5068S Socket Modem module. Suppression of noise is essential to the proper operation and performance of the modem itself and for surrounding equipment. Two aspects of noise in an OEM board design containing the AL5068S Socket Modem module must be considered: on-board/off-board generated noise t
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AL5068S Designer’s Guide 4.1.2 Electromagnetic Interference (EMI) Considerations The following guidelines are offered to specifically help minimize EMI generation. Some of these guidelines are the same as, or similar to, the general guidelines but are mentioned again to reinforce their importance. In order to minimize the contribution of the Socket Modem-based design to EMI, the designer must understand the major sources of EMI and how to reduce the
