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2500
User Manual
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Patton 2500 User Manual

USER
MANUAL
MODEL 2500 Series
Models 2500, 2510, 2520 All-Rate CSU/DSU
SALES OFFICE (301) 975-1000 TECHNICAL SUPPORT (301) 975-1007
TABLE OF CONTENTS
Section Page
1.0 General Information...............................................................2
1.1 Warranty Statement
1.2 Radio and TV Interference
1.3 FCC Information
1.4 Service Information
2.0 Product Overview..................................................................4
2.1 Product Features
2.2 General Product Description
2.3 Supported Applications
3.0 Installation .............................................................................6
3.1 DTE Interface Connections
3.2 Network Interface Connections
3.3 Control Port Interface
3.4 Power
4.0 Configuration .........................................................................8
4.1 Configuration Using Hardware Switches
4.2 Configuration Using Software Switches
5.0 Operation.............................................................................23
5.1 LED Descriptions
5.2 Status Displays
5.3 Loopback Test Modes
5.4 The V.52 BER Test Pattern Generator
5.5 Switched 56 Dialing Commands (Models 2510 & 2520)
Appendix A - Specifications Appendix B - Cable Recommendations Appendix C - Factory Replacement Parts and Accessories Appendix D - Interface Pin Assignments Appendix E - Transmitter Clock Source During Test Loops
1.3 FCC INFORMATION
The Model 2500 Series has been tested and registered in compliance with the specifications in Part 68 of the FCC rules. A label on the equipment bears the FCC registration number. You may be requested to provide this information to your telephone company.
Your telephone company may make changes in its facilities, equipment, operations or procedures that could affect the proper operation of the Model 2500 Series. If this happens, the telephone company should give you advance notice to prevent the interruption of your service.
The telephone company may decide to temporarily discontinue your service if they believe your Model 2500 Series may cause harm to the telephone network. Whenever possible, they will contact you in advance. If you elect to do so, you have the right to file a complaint with the FCC.
If you have any trouble operating the Model 2500 Series, please contact Patton Technical Support at (301) 975-1000. The telephone company may ask you to disconnect the equipment from the telephone network until the problem has been corrected or until you are certain that the Model 2500 Series is not malfunctioning.
The following information may be required when applying to your local telephone company for leased line facilities:
2.0 PRODUCT OVERVIEW
This section provides an overview of the Model 2500 Series, including features, general description, and a breakdown of model numbers by application.
2.1 PRODUCT FEATURES
• Operates over 4-wire dedicated digital lines
• Supports rates of 56 kbps and 64 kbps and all sub rates
• Supports Switched 56 dialing
• Provides both RS-232 and V.35 interfaces
• Features V.52 and V.54 compliant tests
• Nine easy-to-read LED indicators to monitor data signals
• Internal, external or received loopback clocking
• AT&T 62310 compliant
• Can be used as a high speed modem for private twisted pair
• Available in rack card and clusterbox versions
• Made in the USA
Service Digital Facility Service Order Network
Type Interface Code Code Jacks
2.4 Kbps Digital Interface 04DU5-24 6.0F RJ48S
4.8 Kbps Digital Interface 04DU5-48 6.0F RJ48S
9.6 Kbps Digital Interface 04DU5-96 6.0F RJ48S 56 Kbps Digital Interface 04DU5-56 6.0F RJ48S
(Note: As of this publication date, 19.2 and 64Kbps digital services
have not been assigned Digital Facility Interface Codes)
1.4 SERVICE INFORMATION
All warranty and non-warranty repairs must be returned freight prepaid and insured to Patton Electronics. All returns must have a Return Materials Authorization number on the outside of the shipping container. This number may be obtained from Patton Electronics Technical Service at (301) 975-1007. Packages received without an
RMA number will not be accepted.
Patton Electronics' technical staff is also available to answer any questions that might arise concerning the installation or use of your Model 2500 Series. Technical Service hours: 8AM to 5PM EST,
Monday through Friday.
2.2 GENERAL PRODUCT DESCRIPTION
The Model 2500 Series CSU/DSUs operate either synchronously
or asynchronously over 4-wire circuits up to 64 kbps. Rate conversion allows operation with a variety of DTE devices. Diagnostics include V.54 and V.52 loopback tests, as well as CSU loops. Configuration is accomplished by either externally accessible DIP switches or RS-232 software switches (user provides terminal). Nine easy-to-read front panel LED indicators monitor data and control signals. The rear panel presents both RS-232/V.24 and V.35 DTE connections.
The Model 2500 Series is AT&T compliant and supports DDS, Switched 56, Clear Channel 64 and other digital services available from major service providers including AT&T, Sprint and MCI. Dedicated models can also be used as a high speed modem for private twisted pair. The Model 2500 Series is available in standalone or in rack-card configurations (only standalone versions are covered in this manual).
3.0 INSTALLATION
This section describes connection of the Model 2500 Series to the
DTE and telco (line) interfaces, as well as AC power connection
3.1 DTE INTERFACE CONNECTION
The Model 2500 Series has connectors for both V.35 and RS-232 interfaces. Signals output by the Model 2500 Series will appear on both interfaces. An internal jumper is used to select which interface will be used for input. With the jumper in the factory default position, the Model 2500 Series automatically selects which interface will be used for input. If the DTR signal on the RS-232 is active, then the RS-232 inputs are selected. Otherwise, the V.35 inputs are selected. If you choose, you may re-configure the Model 2500 Series for fixed V.35 or fixed RS-232 operation. To do this, follow the steps below:
1) Turn the power switch off.
2) Remove the power cord from the unit.
3) Remove the two screws on the rear panel and slide the board out from the rear.
4) Locate the DTE port selection jumper near the middle of the PC board. This jumper has three pins, two of which are covered by the strap. The factory position of the jumper is with the strap covering the two pins closest to the rear of the unit.
5) To reconfigure the Model 2500 Series for fixed V.35 operation, move the strap so that it covers the two pins closest to the front of the unit.
6) To reconfigure the Model 2500 Series for fixed RS-232 operation, remove the strap altogether (be sure not to lose the strap).
3.1.1 V.35 INTERFACE PORT
For V.35 operation, attach your DTE (terminal) cable to the 34 pin rectangular M/34 connector. The DTE cable should be pinned according to the diagram in Appendix D.
3.1.2 RS-232 INTERFACE PORT
For RS-232 operation, attach your DTE (terminal) cable to the 25 pin DB-25 connector. The DTE cable should be pinned according to the diagram in Appendix D.
3.2 NETWORK INTERFACE CONNECTION
The Network Interface is an 8 position modular connector. Connect this port to the RJ-48S jack provided by the digital data service provider. If the Model 2500 Series is being used for private short haul communication, the twisted pair cable will connect to this port. See Appendix D for the pin assignments of this connector.
4.0 CONFIGURATION
Before you can operate your Model 2500 Series CSU/DSU, you must configure the unit. Configuration may be done using the externally accessible hardware switches or by using the software switches. Software switches can be accessed from the front panel control port using a VT-100 type RS-232 terminal that responds to ANSI escape sequences.
3.3 CONTROL PORT INTERFACE
The Control Port Interface is an 8 position modular connector. If it is to be used, connect this port to an asynchronous terminal using a shielded cable. See Section 4.4 for control port operation.
3.4 POWER
The model 2500 series has a built-in powers supply that is factory configured for either 115 or 230 VAC, depending on how the product is ordered. This power supply is equipped with a shrouded male IEC-320 power entry connector, and is available with a variety of domestic and international power cords (see Appendix C).
In order for the Model 2500 Series unit to operate, the power cord (supplied) must be attached to the power entry connector on the rear of the unit and plugged into an outlet that is easily accessible. The power switch on the rear of the unit must also be turned ON.
4.1 CONFIGURATION USING HARDWARE SWITCHES
The Model 2500 Series defaults to the use of hardware switches for configuration. The unit can also use software switches for configuration (see Section 4.3), in which case the hardware switches will be ignored.
Note: If you are attempting to configure the unit using hardware
switches and find they are being ignored, you will need to override
the software switches and force the unit back into hardware switch
mode. To do this, power-up the unit once with the Line Rate (SW1-
1, 1-2, 1-3) set to Off, Off, Off. Then set the hardware switches as
you require and power-up the unit again.
The hardware configuration mode for the Model 2500 Series uses sixteen externally accessible DIP switches. Figure 1 (below) shows the location of the Model 2500 Series' DIP switches.
The Model 2500 Series’ DIP switches can be configured as either “On” or “Off”. Figure 2 (opposite page) shows the orientation of the DIP switches with respect to ON/OFF positions.
SW2
SW1
ON
For line rates of 56 and 64 kbps, it is possible to operate the DTE interface at a lower rate. To do this, set these switches to 56 or 64 kbps and set the Rate Converter/DTE Rate switches as required.
Figure 2. Close up of DIP switches showing ON/OFF positions.
4.1.1 SWITCH SET SW1
The configuration switches on switch set SW1 allow you to specify Line Rate, Circuit Assurance, RTS, Character Length, Data Format and DSR Loop Status. Figure 3 (below) summarizes SW1 switch settings, including the factory defaults. Following Figure 4 is a description of each switch setting.
SWITCH SET 1 SUMMARY TABLE
Position Function Factory Default
Switch SW1-1 Line Rate Off Switch SW1-2 On Switch SW1-3 On Switch SW1-4 Circuit Assurance Off Disabled Switch SW1-5 RTS Off Forced On Switch SW1-6 Character Length Off 10 Bit Switch SW1-7 Data Format Off Synchronous Switch SW1-8 DSR Loop Status Off DSR Off
Figure 3. Summary of switch settings, showing factory defaults
Line Rate
These switches control the signalling rate on the line (RJ-48S port).
They should match the speed of your digital service.
SW1-1 SW1-2 SW1-3 Setting
On On On 2.4 kbps On On Off 4.8 kbps On Off On 9.6 kbps On Off Off 19.2 kbps Off On On 56 kbps Off On Off 64 kbps Off Off Off Force configuration pointer to
(continued)
56,000 bps
}
Model 2510 Enabled
default to hardware switches (See Section 4.2)
Circuit Assurance
On dedicated circuits, the transmitter and the CTS output can be configured to go On only when a working communication circuit is established. If Circuit Assurance is used, enable it on only one end of the communication link. In Switched 56 mode, this switch should be set to On on both ends of the circuit.
Circuit
SW1-4 Assurance Description
On Enabled CTS will go low and the
transmitter will be held off if the receiver is in the No Signal state or CD is low
Off Disabled The transmitter and CTS will
operate without regard to the receiver state
RTS
The RTS input can be forced on, ignoring the terminal’s RTS signal. RTS controls the transmitter by either sending the user’s data or sending an idle code. Force RTS should be enabled in Switched 56 mode.
SW1-5 RTS Description
Off Forced On An On (high) condition is trans-
mitted regardless of the state of this unit’s RTS input
On Follows DTE The RTS input controls the
transmitter
Note: At 64K line rate, RTS is always Forced On.
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