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2500
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Patton 2500 User Manual

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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.
Character Length
4.1.2 SWITCH SET SW2
In asynchronous data format, 10 and 11 bit characters are
supported. This setting is ignored in synchronous data format.
Character Character Description
SW1-6 Length Start Data bits Parity Stop bits
Off 10-bit 1 8 None 1 or more
1 7 1 1 or more 1 7 None 2
On 11-bit 1 8 1 1 or more
1 9 None 1 or more
Data Format
The data format selection controls whether an async-to-sync conversion is performed. (Data is always transferred synchronously between the two CSU/DSU’s)
SW1-7 Data Format
On Asynchronous Off Synchronous
Note1: The async rate of 57.6 kbps is supported at the 56kbps line rate, provided the DTE equipment transmits two stop bits. Two stop bits can be configured on most DTE equipment. This extra stop bit reduces the DTE’s effective data rate by a few percent to allow synchronization with the 56kbps line speed.
Note2: Lower speed asynchronous data can be transmitted on synchronous circuits by simple over-sampling. To do this, leave Data Format set to synchronous. Make sure the CSU/DSU’s sync data rate is at least 4 times more than the async data rate you wish to send.
DSR Loop Status
The behavior of the DSR output during performance of a local loop can be controlled.
DSR
SW1-8 Loop Status Description
On DSR On DSR remains high (On) during the
Analog Loop
Off DSR Off DSR goes low (Off) during the
Analog Loop
The configuration switches on switch SW2 control the Rate Adapter/DTE Rate, Clock Mode, Anti-Stream Timer and RTS/CTS Delay. Figure 5 (below) summarizes SW2 switch settings, including the factory defaults. Following Figure 4 is a description of each switch setting.
Rate Adapter/DTE Rate
The Model 2500 Series includes a rate adapter that allows the unit to be used with DTE devices that support rates lower than 56/64 kbps. All switch settings below are valid for line rates of 56 or 64 kbps.
Note: for DTE devices that operate at 57.6 kbps, set the Line Rate to 56 kbps (see Section 4.1.1), set the rate adapter for “Line Rate=DTE Rate”, and configure your DTE device for two stop bits (set character length accordingly).
SW2-1 SW2-2 SW2-3 DTE Rate
On On On 2.4 kbps Off On On 4.8 kbps On Off On 9.6 kbps Off Off On 19.2 kbps On On Off 38.4 kbps Off Off Off Line Rate = DTE Rate
DTE Loop Control
CTS Delay
The local loop and remote loop can be activated from the DTE
interface using signals “LL” and “RL”.
SW2-4
On Enable LL and RL inputs Off Disable
Clock Mode
The appropriate transmitter clocking modes can be selected for
Dedicated DDS, Switched-56 or campus-area (private) operation.
SW2-5 SW2-6 Mode Description
On Off External Clock Mode Transmit Clock derived
from terminal interface
Off Off Network Clock Mode Transmit clock derived
(Looped Clock Mode) from the received line
signal; Use this mode for Dedicated DDS operation
On On Internal Clock Mode Transmit Clock derived
internally
Off On Switched 56 (Model 2510, 2520)
Anti-Stream Timer
The anti-stream timer protects multidrop networks from a drop that is continuously transmitting. If the terminal keeps RTS raised for more than 30 seconds, the timer forces RTS off internally. This allows the rest of the multidrop network to resume operation. The CSU/DSU remains in the forced-off condition until the terminal drops RTS.
The RTS/CTS turn-on delay can be set to Normal or Extended.
Delay in mSec at Various Line Rates
SW2-8 CTS Delay 56 19.2 9.6 4.8 2.4
Off Normal 0.3 0.9 1.9 3.8 7.5 On Extended 1.3 3.8 7.5 15 30
4.2 CONFIGURATION USING SOFTWARE SWITCHES
The Model 2500 Series CSU/DSUs can be soft configured using a VT100 terminal or similar RS-232 DTE with terminal emulation. To use software switches for configuration, follow these steps:
1) Connect the serial RS-232C port of the terminal to the modular
EIA-561 control port on the front panel of the Model 2500 Series.
To construct an RS-232 to EIA-561 patch cable, refer to the control port pinout diagram in Appendix D.
2) Power up the terminal and set its RS-232C port as follows: 9600 baud
8 data bits, 1 stop bit, no parity local echo CR = CR/LF on inbound data ANSI, VT-100 emulation
3) Key menu, then press [RETURN]. The Model 2500 Series
Main Menu should then display on the terminal screen (see below).
Timer Value in Sec at Various Line Rates
SW2-7 Timer 56 19.2 9.6 4.8 2.4
On Disabled Off Enabled 2 4 8 15 30
4.2.1 USING THE SOFTWARE MENU SYSTEM
The Model 2500 Series Menu System operates as follows:
1) All selections must be followed by [RETURN].
2) To make a selection from any menu, enter the option number at the prompt and press [RETURN].
3) To exit any menu without making a selection, press [ESC] followed by [RETURN]. (Note: You can also exit by just pressing [RETURN]. However, doing this in the Store Phone Number Menu will clear the buffer of the currently stored number.)
4.2.2 VERIFYING SOFTWARE SWITCH CONTROL
In order to use software switches for configuration, it is necessary to disable the hardware switch settings. To do this, use the following procedure (Note: If this procedure is omitted, your software configurations will be overridden by the hardware switch settings):
1) On the Main Menu (opposite page), choose item 1, “Select Hardware/Software Switch Control”. The following screen will appear:
2) In the Hardware/Software Control Menu, select item 2 to enable software switch control.
3) The Main Menu will automatically reappear after your selection is entered.
Circuit Assurance
Character Length
Choosing option 2 in the Software Switch Menu takes you to the Circuit Assurance Menu (below). On dedicated (DDS) circuits, the transmitter and the CTS output can be configured to go ON only when a working communication circuit is established. If you use Circuit Assurance with DDS services, enable it on only one end of the communication link. For Switched-56 service, enable Circuit Assurance on both ends of the circuit. When Circuit Assurance is disabled, the transmitter and CTS operate without regard to the receiver state.
Force RTS
Choosing option 3 in the Software Switch Menu takes you to the RTS Menu (below). The RTS input can be forced ON, ignoring the RTS signal from the DTE. RTS controls the transmitter by sending either user data (when high) or idle code (when low). On a Model 2510 or 2520, Force RTS should be enabled for Switched-56 operation.
Choosing option 4 in the Software Switch Menu takes you to the Character Length Menu (below). In asynchronous data format, the Model 2500 Series supports 10-bit and 11-bit character lengths. Set this option according to the characteristics of the data being transmitted.
DTE Data Format
Choosing option 5 in the Software Switch Menu takes you to the Data Format Menu (below). This option controls whether an async-to­sync conversion is performed between the DTE and the Model 2500 Series. (Data is always transferred synchronously between two Model 2500 Series units.) For an asynchronous DTE, select the asynchronous data format
1,2
; for a synchronous DTE, select the
synchronous data format.
Note: When the Line Rate (Software Switch Menu option 1) is 64 kbps, RTS is always forced ON, regardless of the Force RTS switch setting.
Note1: The async rate of 57.6 kbps is supported at the 56 kbps line rate, provided the DTE equipment transmits two stop bits. Two stop bits can be configured on most DTE equipment. This extra stop bit reduces the DTE’s effective data rate by a few percent to allow synchronization with the 56 kbps line speed. Set the Model 2500 Series for two stop
bits by selecting “11 bit character length” in the Character Length Menu.
(continued)
Note2: You can use the Model 2500 Series to transmit lower-speed
asynchronous data (up to 9.6 kbps) over synchronous circuits by simple over-sampling. To do this, select the synchronous data format and set the line Line Rate (Software Switch Menu option 1) to at least four times that asynchronous data rate you wish to send. For example, use a Line Rate of 9.6 kbps or higher for 2.4 kbps async data.
DSR Status During Local Loopback
Choosing option 6 in the Software Switch Menu takes you to the DSR Loop Status Menu (below). This option controls the behavior of the DSR output during local loopback. To force DSR high (ON) during local loopback, enable this option. To force DSR low (OFF) during a local loopback, disable it.
Rate Converter/DTE Rate
Choosing option 7 in the Software Switch Menu takes you to the Rate Adapter/DTE Rate Menu (opposite page). The Model 2500 Series rate converter adapts a 56 kbps or 64 kbps line rate to slower DTE data rates. Set the Rate Converter to match the DTE data rate. If the DTE data rate is the same as the line rate, disable rate conversion by selecting item 6 on this menu.
(continued)
5.0 OPERATION
Once the Model 2500 Series unit is installed and configured properly it is ready to operate. This section describes the function of the LED indicators, the status displays, the use of loopback test modes, and Switched 56 dialing procedures (Models 2510 and 2520 only).
• “OS” glows red to indicate Out-of-Service. This means the Model 2500 Series has received an Out-of-Service signal from the digital service provider and indicates a problem with the service provider’s equipment. If this condition persists, contact your service provider.
5.1 LED DESCRIPTIONS
The Model 2500 Series is equipped with nine LED indicators that monitor the status of communication. Figure 5 (below) shows the location of the LEDs on the Model 2500 Series front panel. Note also the location of the test mode switches and RS-232 control port (used in Switched 56 dialing as well as software configuration). Following Figure 5 is a description of each LED’s function.
• “TD” and “RD” will glow red to indicate an Idle condition or Binary “1” data on the respective terminal interface signals. Green indicates Binary “0” data.
• “CTS” will glow red to indicate an Off condition. Green indicates an On condition. When on, the unit is ready to send data. If CTS remains off, check the Forced RTS, Circuit Assurance and Anti-Stream settings.
• “CD” will glow green to indicate that the a valid carrier is present. Red indicates that there is no valid carrier detected.
• “ER” glows red to indicate that an error has been detected in the received signal. ER will flash if the Model 2500 Series receives illegal bi-polar violations or framing errors. During the 511 or 511/E test, ER will flash to indicate that the Test Pattern Detector has detected a bit error.
• “TM” glows red to indicate Test Mode. It will light if the unit is placed into a test mode. The unit can be placed in test mode by the local user, by the remote user or by the service provider.
5.2 STATUS DISPLAYS
The Model 2500 Series lets you use a VT-100 type RS-232 terminal to display the current configuration settings, as well as the line/loop status.
5.2.1 DISPLAYING CONFIGURATION SETTINGS
To display the current settings of the hardware and /or software switches, go to the Main Menu (see Section 4.2) and select item 2, “Read Configuration”. This will take you to the Read Configuration Menu (below).
• “DTR” will glow green to indicate that the DTR signal from the terminal is active.
• “NS” will glow red to indicate No Signal. This means the Model 2500 Series receiver does not detect a signal from the digital service provider (or, in the case of short-haul operation, from the remote Model 2500 Series). If NS is lit, check for an unplugged cable, broken wire or an incorrect Line Rate selection.
(continued)
(continued)
Figure 6. Local analog loop
Figure 7. Remote digital loop
Figure 8. CSU loop
Figure 9. DSU loop
(APPENDIX D - Continued)
DB-25 CONNECTOR, TERMINAL INTERFACE
Pin # Signal
1 Frame Ground 2 TD 3 RD 4 RTS 5 CTS 6 DSR 7 SGND (Signal Ground)
8 CD 15 TC 17 RC 18 LL (Local Loop) 20 DTR 21 RL (Remote Loop) 24 XTC 25 TM (Test Mode)
CONTROL PORT INTERFACE
8 Position modular connector compliant with EIA-561.
APPENDIX E
TRANSMITTER CLOCK SOURCE DURING TEST LOOPS
RC = Received Clock
Pin # Signal
4 Signal Ground
5 RD (Output) 6 TD (Input)
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