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DSP 9612 Flash Poll Modem
User’s Guide
0049 −0117 −100 Rev. A
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Contents CHAPTER 1 INTRODUCTION........................................................ 5 FEATURES .............................................................................................. 6 APPLICATIONS........................................................................................ 7 CHAPTER 2 INSTALLATION......................................................... 9 UNPACKING YOUR HARDWARE.............................................................. 9 ADDITIONAL ITEMS YOU NEED .....
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Contents NOTES Page iv
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Chapter 1 Introduction ongratulations for purchasing the finest industrial-grade fast- poll modem available. C The Telenetics DSP9612 (Flash Poll) modem is a 9600/4800/0- 1800 bps modem designed for 4-wire, full-duplex or 2-wire, half- duplex operation over a voice-band leased line or private line. The modem is designed utilizing the latest digital-signal processing (DSP) technology to achieve high performance. The modem employs Telenetics’ proprietary modulation and encoding scheme to achieve
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Introduction Features The DSP9612 modem is specifically designed for harsh environments found in utility substations and industrial facilities. Though functionally similar to commercial modems, the DSP9612 provides the following unique features that make it well suited for utility and industrial applications. Packaged in a rugged, compact enclosure for industrial applications. Leased-line interface protected with heavy-duty surge protection hardware (15KV). Requires no human intervention, mak
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Applications Applications The DSP9612 modem is designed for point-to-point and multipoint data communications. Figure 1-1 shows a typical multipoint configuration. Figure 1-1. Network of Multipoint Configuration There are a number of factors that can affect the network’s and modem’s operation and performance. These include: Operating speed 2-wire or 4-wire configuration Transmission line characteristics, noise, and line impairments Network configuration (point-to-point or multipoint) Number
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Introduction NOTES Page 8
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Chapter 2 Installation his chapter describes how to install the modem. T Unpacking Your Hardware Your package should include: At least one of the following DSP9612 modems: − Model DSP9612FP for 85 to 265 VAC − Model DSP9612-LV for 10 to 53 VDC A leased-line cable A shielded DC power cable (model DSP9612-LV modem only) This User’s Guide If your package contents are damaged or missing, please contact your place of purchase immediately. Additional Items You Need To use your modem, you need the
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Installation A power supply that provides either: − 85 to 265 Volts AC, 50 to 60 Hz, single phase or 85 to 400 VDC (if you have the model DSP9612FP modem), or − 10 to 53 Volts DC (if you have the model DSP9612-LV modem) Hardware Overview Back View Figures 2-1 and 2-2 show the back view of the two DSP9612 modem models. Starting from the left side, these views show: A 4-wire/2-wire configuration block. See page 26. A female, 25-pin RS-232 connector, for connecting a standard DTE (RTU). See page
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Hardware Overview Figure 2-2. Back View of Model DSP9612-LV Modem Front View The Model DSP9612FP and Model 9612-LV modems have identical front panels. Figure 2-3 shows the front view of the modem. Starting from the left side, this view shows: A set of nine LEDs. See page 29. A loopback test switch. See page 30. Figure 2-3. Front View of Modem Page 11
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Installation Installation Summary The modem installation involves the following steps: 1. Finding a suitable location for the modem. See the section below. 2. Configuring the modem. See page 13. 3. Connecting to a transmission line. See page 25. 4. Connecting to a voltage source. See page 27. 5. Connecting a DTE device. See page 28. Finding a Suitable Location The location you select should provide easy access to the back panel communications interface(s) and front panel power interface. It shou
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Configuring the Modem Configuring the Modem You configure the modem using the three sets of DIP switches on the bottom of the modem. It is important to follow the three steps described below, in the order shown, to ensure that you configure IMPORTANT your modem properly using the modem DIP switches: 1. Use DIP switch 3 (SW3) to configure the modem for your host DTE interface and network topology. Using SW3, you select the modem to operate in high-speed fast-poll or low-speed (FSK) mode. 2. If y
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Installation SW1 DIP Switch Settings SW1 is an 8-position DIP switch. Table 2-1 shows the modem switch settings for DIP switch SW1. A description of the SW1 switch settings follows the table. Note: SW1 settings apply for both high-speed fast-poll and low- speed (FSK) modes Table 2-1. Modem Switch Settings for DIP Switch SW1 Switches Switch Settings ON OFF (Default) (see Table 2-2 on page 15) SW1-1 − 1-4: Transmit Level (page 15) SW1-5: Receiver Dynamic Range −10 to −43 dBm +3 to −30 dBm (page 16
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Configuring the Modem SW1-1 through SW1-4 − Transmit Level Switches SW1-1 through SW1-4 adjust the modem’s transmit level. Table 2-2 shows the transmit levels you can select using these switches. Table 2-2. Transmit Levels SW1 through SW4 Switch Settings SW1-1 SW1-2 SW1-3 SW1-4 Transmit Level 0 dBm OFF OFF OFF OFF OFF OFF OFF ON −1 dBm OFF OFF ON OFF −2 dBm −3 dBm OFF OFF ON ON −4 dBm OFF ON OFF OFF OFF ON OFF ON −5 dBm OFF ON ON OFF −6 dBm −7 dBm OFF ON ON ON ON OFF OFF OFF −8 dBm ON OFF OFF ON
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Installation SW1-5 − Receiver Dynamic Range SW1-5 ON = −10 to −43 dBm OFF = +3 to −30 dBm For a low receive signal level, set SW1-5 to ON ( −43 dBm ). For short distances or to select a strong receive signal, set SW1-5 to OFF. SW1-6 and SW1-7 − Cable Equalizer (Fast-Poll Mode Only) SW1-6 ON = Enable TX Cable Equalizer OFF = Disable TX Cable Equalizer SW1-7 ON = Enable RX Cable Equalizer OFF = Disable RX Cable Equalizer To improve or extend the modem’s polling performance, use the fixed Compromis
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Configuring the Modem SW2 DIP Switch Settings SW2 is an 8-position DIP switch. Table 2-3 shows the modem switch settings for DIP switch SW2. A description of the SW2 switch settings follows the table. Table 2-3. Modem Switch Settings for DIP Switch SW2 Switches Switch Settings ON OFF (Default) SW2-1: FSK Mode (page 18) V.23 Bell 202 SW2-2: Receiver Squelch (page 18) Turnaround Turnaround (valid for FSK mode, 2-wire half-duplex Squelch (Bell Squelch (Bell 202): operation only) 202): 8ms 0ms Turn
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Installation SW2-1 FSK Mode SW2-1 ON = ITU-T V.23 mode OFF = Bell 202 mode The modem has two FSK modes: Bell 202, which supports data rates from 0 to 1800 bps ITU-T V.23, which supports data rates from 0 to 1200 bps SW2-1 configures the modem for either of these FSK modes. Setting SW2-1 to ON selects ITU-T V.23 mode. In this mode, the modem complies with ITU-T (CCITT) recommendation V.23 with the following parameters: Mode 2 modulation only No backward channel No provisions for disablemen
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Configuring the Modem wire, half-duplex mode (SW3-7 ON), the modem squelches the receiver after RTS is turned off to prevent far-end echoes from causing data errors. The duration that the modem squelches the receiver is either: 8 milliseconds if the modem is configured for Bell 202 mode (SW2-1 OFF) 150 milliseconds if the modem is configured for ITU-T V.23 mode (SW2-1 ON) SW2-3 FSK Soft Carrier (Bell 202 FSK Mode Only) SW2-3 ON = None OFF = 8ms SW2-3 controls the soft carrier and is valid fo
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Installation When the modem is configured for V.23 operation (SW2-1 ON), the RTS-CTS delay is fixed at 33 ms. SW2-6 FSK CD Delay (Bell 202 Mode Only) SW2-6 ON = 23ms OFF = 6ms SW2-6 selects the FSK CD delay and is valid when Bell 202 mode is active (SW2-1 OFF). Setting SW2-6 ON configures the modem to turn on CD 23 milliseconds after it detects a valid carrier signal. Setting this switch to OFF configures the modem to turn on CD 6 milliseconds after it detects a valid carrier signal. This swit
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Configuring the Modem SW3 DIP Switch Settings SW3 is a 10-position DIP switch. Table 2-5 shows the modem switch settings for DIP switch SW3. A description of the SW3 switch settings follows the table. Table 2-5. Modem Switch Settings for DIP Switch SW3 Switches Switch Settings ON OFF (Default) SW3-1: Fast Poll/FSK (page 22) FSK Fast Poll Auto-Rate SW3-2: Data Rate (page 23) 4800 bps 9600 bps SW3-3: Async Character (page 23) 11 bits 10 bits SW3-4: Auto RTS (page 23) Enabled Disabled SW3-5: Transm
