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Summary of Contents for DLS 50
- Page 1 Operating Manual DLS 50 ISDN Wireline Simulator Revision 5 January 1, 2000 TestW rks...
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Page 3: Table Of Contents
2. ISDN BACKGROUND ............5 The ISDN U-Interface ............5 ANSI Specifications ............... 6 3. OPERATION ............... 7 Powering On the DLS 50............7 Connecting the DLS 50............9 Changing the Cable Length ........... 9 Configuring the DLS 50............10 4. REMOTE CONTROL ............13 IEEE 488 Interface...............14... - Page 4 4.7.4 :SYStem:COMMunicate:SERial:FORMat <format> ....32 4.7.5 :SYStem:COMMunicate:SERial:PACE <pace> ...... 33 DLS 50 Synchronization............34 References................35 5. WARRANTY..............36 6. SHIPPING THE DLS 50............ 38 7. SPECIFICATIONS ............39 ELECTRICAL..............41 7.1.1 AC Power ................41 ENVIRONMENTAL ............41 MECHANICAL ..............41 OPERATING CONDITIONS ..........41 8.
- Page 5 8.2.1 Before Operating the Unit............45 8.2.2 Operating the Unit..............45 SYMBOLS ................46 INDEX..................47 Page iii...
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Page 7: Introduction
1. INTRODUCTION 1.1 About this Manual The DLS 50 Operating Manual can be used to learn about the unit for the first time, or can be used as a look up reference book. We suggest that you carefully read the introduction sections of this manual before powering on your unit. -
Page 8: Dls 50 Overview
The user can easily change the length of the simulated cable by using the front panel of the DLS 50 or by using a computer. It is meant to be used in laboratories, production lines etc. to simulate "real life" wireline situations on bench top. - Page 9 Introduction The standard DLS 50 simulates 12 kft or 3.6 km of wireline. The extended version provides an additional 8 kft or 2.4 km of wireline. The various types of DLS 50 that are presently available are: Standard DLS 50...
- Page 10 Introduction Fig. 1.2 The DLS 50's Back Panel 5. AC power input plug 6. Power voltage selector and fuse case 7. IEEE 488 interface connector for remote control. 8. RS-232 serial interface connector for remote control. 9. Modular connector for device under test (internally connected to items 3, 10 and 11).
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Page 11: Isdn Background
U-Interface. These bi-directional 160 kbps (i.e. 144 kbps with 16 kbps overhead) signals are coded as either a 2B1Q signal, or a 4B3T signal depending on the administration. The DLS 50 is especially suited to simulate line Page 5... -
Page 12: Ansi Specifications
Getting Started conditions for either of these. The signal is terminated at the customer premises via a Network Terminator (NT). The DLS 50 simulates the physical parameters of the U-interface in order to stress test U-interface transmission products. 2.2 ANSI Specifications ANSI specification T1.601 describes the physical characteristics of the two wire ISDN... -
Page 13: Operation
The DLS 50 uses a two fuse configuration. To operate the DLS 50, connect the unit to the power source, and turn on the unit. One convenient feature of the DLS 50 is that the last configuration used is kept latched into the relays, allowing the unit to be used even when the power is turned off. - Page 14 The self-test results can be maintained on screen by keeping the left arrow key pressed when the power is turned on. If one of the self-test fails, the DLS 50 will show an error screen with some explanation of the problem, in which case call the factory. Following is a short description of the self-test done by the DLS 50 after a reset.
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Page 15: Connecting The Dls 50
The side A of the simulated wireline can be accessed from any of the RJ-45 connectors labelled "A" at the front or at the back of the DLS 50, or from the terminal blocks at the back of the DLS 50. The user can also inject impairments to side A of the wireline by using the "noise"... -
Page 16: Configuring The Dls 50
Getting Started The resolution of the cable length is 100 ft for units that use feet, and 50 m for units that use metres. The DLS 50 sets the cable length after 1 second of keyboard inactivity . 3.4 Configuring the DLS 50 Pressing both the Left and Right arrow keys at the same time gets into the unit setup menus, where some of the operational characteristics of the unit can be changed. - Page 17 Getting Started To change the IEEE 488 address of the DLS 50 use the following steps: • From the main screen, press both the left and right arrows simultaneously. • Press the right arrow once to get to the IEEE 488 Address screen.
- Page 18 Getting Started On power up, the DLS 50 can restore the length of the wireline that was used when the power was turned off, or it can set the length to 0. To change the setting use the following steps: •...
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Page 19: Remote Control
Remote Control 4. REMOTE CONTROL The DLS 50 can be remote-controlled via the IEEE 488 (also known as the GPIB bus) and RS-232 (serial) interface, allowing the integration of the DLS 50 into a larger test system. The DLS 50 remote control is designed with several standards in mind: •... -
Page 20: Ieee 488 Interface
4.1.2 IEEE 488 Address The IEEE 488 address of the DLS 50 can be set to any of the valid value as defined in the IEEE 488.1 standard, which can be from 0 to 30. The address can be change by using the front panel (see section 3.4) or remotely (see section 4.7.2). - Page 21 NOTE: The Factory default is to clear all enable registers on power up. See *PSC, *ESE and *SRE commands for more details. We recommend that you set the DLS 50 to raise the SRQ line when there is a message available and when there is an error. The control program should follow those steps: •...
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Page 22: Resetting The Dls 50
The DLS 50 uses a female DB-25 connector, and is configured as a DCE device. To use the serial interface, simply connect your computer to the DLS 50 and set both the computer and DLS 50 to the same protocol: baud rate, data format and flow control. Do NOT use a null modem. -
Page 23: Baud Rate
The flow control allows the receivers to stop and to restart the data transmission in order to prevent data loss. Both the computer program and the DLS 50 must be set with the same flow control selection. Note that some communication programs may only support some of the 5 flow control options that the DLS 50 has, and in some cases, the terminology may differ. - Page 24 Remote Control 4.2.3.1 "None" Flow Control In most cases, there is no need for flow control because of the simplicity of the DLS 50. The "None" flow control selection can be a valid choice if only one command at a time is sent with some delay between them.
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Page 25: Message Terminators
(decimal 10, hex 0A, LF). To ensure that no characters were left in the receive buffer of the DLS 50 from an old, incomplete command, you can send the line feed character by itself before sending new commands. Messages from the DLS 50 are always terminated with a Line Feed character. -
Page 26: Command Syntax
Set"). 4.4 Command Syntax The DLS 50 adheres to the IEEE 488.2 format for command syntax. As with the Data Format, the principle is forgiving listening and precise talking. Commands may take one of two forms, either a Common Command or a Device Dependent Command. -
Page 27: Status Reporting
*ESE?;*SRE? :SET:CHAN:LEN? When a command does not begin with a colon, the DLS 50 assumes that the command is at the same level as the previous command. For example, to set the serial interface, one does need to specify `:SYStem:COMMunicate:SERial' each time, such as in: :SYStem:COMMunicate:SERial:BAUD 9600;PACE CTS... -
Page 28: Status Byte Register (Stb)
RQS and SRQ are defined by the IEEE 488.1 standard and are hardware related. MSS summarizes all the status bits of the DLS 50, as defined by the IEEE 488.2 standard. bits 7, 3, 2, 1,and 0 are not used by the DLS 50. -
Page 29: Event Status Register (Esr)
Not used, so this bit is always 0. bit 7 Power on. This bit is set when the DLS 50 is turn on. Sending *ESR? clears the bit and stay cleared until the power is turned on again. -
Page 30: Common Command Set
Remote Control 4.6 Common Command Set As specified in the IEEE 488.2 standard, a number of common commands are required to set up and control of standard functions of remote controlled devices. These common commands are as follow: *CLS CLEAR STATUS COMMAND Type: Status command Function:... - Page 31 *ESE command section. *IDN? IDENTIFICATION QUERY Type: System command Function: Returns the ID of the unit. Upon receiving this command the DLS 50 will put into the output queue the following string: DLSTESTWORKS LTD, DLS 50 <Gauge>- <MaxLen Unit>,<SN>,<Ver> where: <Gauge>...
- Page 32 Function: Indicates to the controller when the current operation is complete. This command will cause the DLS 50 to set bit 0 in the Event Status Register (ESR) when all pending operations are completed. The bit is read with the *ESR? command, which also clear the bit.
- Page 33 IEEE 488.2 level 3 reset. This command will set the length of the DLS 50 to 0 kft (or 0 km), and cancel any pending *OPC operation. It will not affect the output buffer or other system settings of the unit.
- Page 34 RQS (see section 4.5.1 for more details). *TRG TRIGGER Type: Trigger command Function: Trigger operation of the device. Since the DLS 50 has no functions that can be triggered this command has no effect on the operation of the unit. Page 28...
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Page 35: Self-Test
WAIT TO CONTINUE Type: Synchronization command Function: Used to delay execution of commands. The DLS 50 will ensure that all commands received before "*WAI" are completed before processing any new commands. This means that all further communication with the DLS 50 will be frozen until all pending operations are completed. -
Page 36: Device Dependent Command Set
Each section of the command may be sent in the full or the truncated form (indicated in upper case). The command itself may be sent in upper or lower case form. The DLS 50 will round any number to the nearest number permitted by the resolution of the parameter. -
Page 37: System:communicate:gpib:address
Remote Control To query the length currently simulated by the DLS 50 send: :SET:CHAN:LEN? The command will return an integer number ranging from 0 to the maximum length followed by the units. For example, if the length of the wireline is 8.5 kft, the return... -
Page 38: System:communicate:serial:format
Remote Control For example, to set the baud rate to 9600 bit per second, send: :SYS:COMM:SER:BAUD 9600 bps The units are optional, but they must be "bps" if used. Note that the new baud rate must be used immediately for any further serial communication. -
Page 39: System:communicate:serial:pace
In order to simplify the setting of the serial interface, we have slightly modified the command set as specified by the SCPI standard. The SCPI standard requires separate settings for parity, character size, and number of stop bits. The DLS 50 combines the three settings. -
Page 40: Dls 50 Synchronization
The SCPI standard requires separate settings for the RTS/CTS flow control and XOn/XOff pacing, and differentiates between the receive and the transmit sides. The command set of the DLS 50 combines the ":RTS" and the "XON" settings into one ":PACE" command. -
Page 41: References
*OPC? will return an ASCII "1" when all pending operations are completed. Make sure that all the required enable bits are set. When using *OPC or *OPC?, the program controlling the DLS 50 can determine when the operation is completed by waiting for SRQ, or by reading the status byte with the serial poll or with *STB? (if corresponding bits are enabled). -
Page 42: Warranty
DLS TestWorks to inspect and repair the equipment. If inspection by DLS TestWorks discloses a defect in workmanship or material it shall, at its option, repair or replace the equipment without cost to the customer, and return it to the customer by the least expensive mode of transportation, the cost of which shall be prepaid by DLS TestWorks. - Page 43 DLS TestWorks, be effective to extend the warranty coverage provided herein. In no event (including, but not limited to the negligence of DLS TestWorks, its agents or employees) shall DLS TestWorks be liable for special consequential damages or damages arising from the loss of use of the equipment, and on the expiration of the warranty period all liability of DLS TestWorks whatsoever in connection with the equipment shall terminate.
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Page 44: Shipping The Dls 50
Shipping 6. SHIPPING THE DLS 50 To prepare the DLS 50 for shipment, turn the power off and disconnect all cables, including the power cable, and pack the simulator in the original carton. Do not place any cables or accessories directly against the front panel as this may scratch the surface of the display. -
Page 45: Specifications
The attenuation accuracy is within ±?5% ±0.2 dB of the response of an ideal cable in the 10 kHz to 50 kHz frequency range, ±4% ±0.2 dB from 50 kHz to 300 kHz and ±8% ±0.2 dB from 300 kHz to 500 kHz. -
Page 46: Serial Poll
Specifications IEEE 488 Remote Control: The unit can be controlled via an IEEE 488 interface. The unit supports the following functions: Listener Talker Local Lockout Serial Poll Selective Device Reset Bus Reset Primary Addressing from 0 to 30 RS-232 Remote Control: The unit can be controlled via a RS-232 serial interface. -
Page 47: Electrical
In order for the unit to operate correctly and safely, it must be adequately ventilated. The DLS 50 contains ventilation holes for cooling. Do not install the equipment in any location where the ventilation is blocked. For optimum performance, the equipment must be operated in a location that provides at least ½"... - Page 48 Specifications ventilation holes. Blocking the air circulation around the equipment may cause the equipment to overheat, compromising its reliability. Page 42...
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Page 49: Safety
8.1.3 Supply Power Requirements The unit can operate from any single phase AC power source that supplies between 100V and 240V (±10%) at a frequency range of 50 Hz to 60 Hz. For more information, see the specifications section of this manual. -
Page 50: Mains Fuse Type
Operating and Reference Manual is in direct violation of the standards of design, manufacture and intended use of the equipment. DLS TESTWORKS LTD. assumes no liability for the customers failure to comply with any of these requirements. -
Page 51: Before Operating The Unit
Safety 8.2.1 Before Operating the Unit Inspect the equipment for any signs of damage, and read the Operating and Reference Manual thoroughly. Install the equipment as specified in the relevant section of this manual. Ensure that the equipment and any devices or cords connected to it are properly grounded. -
Page 52: Symbols
Safety 8.3 SYMBOLS This symbol appears on the unit and has the following meaning: FIG. 8.1 "PROTECTIVE GROUNDING CONDUCTOR TERMINAL" Page 46... -
Page 53: Index
INDEX *CLS...........................23 *ESE....................15, 20, 21, 24, 25 *ESR....................15, 21, 23, 25, 28 *IDN ......................15, 20, 21, 25 *OPC ....................22, 25, 26, 34, 35 *PSC ......................15, 24, 26, 27 *RST........................20, 26 *SRE......................15, 20, 21, 27 *STB......................15, 21, 28, 35 *TRG ........................ - Page 54 MAV....................15, 22, 27, 28, 34 Message Terminators..................... 16, 19 MSS ........................ 22, 27, 28 NR1..........................19 NRf ..................19, 21, 24, 26, 27, 30, 31 port ......................13, 16, 19, 34 query ....................15, 20, 23, 31, 32, 33 References ........................35 Reset ........................26, 40 RQS........................