Patton electronics 2703 Manual de usuario

USER

MANUAL

MODEL 2703

G.703/E1 Digital Modem

SALES OFFICE

(301) 975-1000

TECHNICAL SUPPORT

(301) 975-1007

http://www.patton.com

Part# 07M2703-I

Doc# 031041UI

Revised 08/16/99

An ISO-9001

Certified Company

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 2703 components to be

free from defects, and will—at our option—repair or replace the prod-

uct should it fail within one year from the first date of shipment.

This warranty is limited to defects in workmanship or materials,

and does not cover customer damage, abuse, or unauthorized modifi-

cation. If this product fails or does not perform as warranted, your sole

recourse shall be repair or replacement as described above. Under no

condition shall Patton Electronics be liable for any damages incurred

by the use of this product. These damages include, but are not limited

to, the following: lost profits, lost savings and incidental or consequen-

tial damages arising from the use of or inability to use this product.

Patton Electronics specifically disclaims all other warranties,

expressed or implied, and the installation or use of this product shall

be deemed an acceptance of these terms by the user.

1.1 RADIO AND TV INTERFERENCE

The Model 2703 generates and uses radio frequency energy, and

if not installed and used properly—that is, in strict accordance with the

manufacturer's instructions—may cause interference to radio and tele-

vision reception. The Model 2703 has been tested and found to com-

ply with the limits for a Class A computing device in accordance with

the specifications in Subpart J of Part 15 of FCC rules, which are

designed to provide reasonable protection from such interference in a

commercial installation. However, there is no guarantee that interfer-

ence will not occur in a particular installation. If the Model 2703 does

cause interference to radio or television reception, which can be deter-

mined by disconnecting the cables, the user is encouraged to try to

correct the interference by one or more of the following measures:

moving the computing equipment away from the receiver, re-orienting

the receiving antenna, and/or plugging the receiving equipment into a

different AC outlet (such that the computing equipment and receiver

are on different branches).

1.2 CE NOTICE

The CE symbol on your Patton Electronics equipment indicates

that it is in compliance with the Electromagnetic Compatibility (EMC)

directive and the Low Voltage Directive (LVD) of the Union European

(EU). A Certificate of Compliance is available by contacting Technical

Support.

1.3 SERVICE

All warranty and nonwarranty repairs must be returned freight pre-

paid and insured to Patton Electronics. All returns must have a Return

Materials Authorization number on the outside of the shipping contain-

er. This number may be obtained from Patton Electronics Technical

Services at:

tel: (301) 975-1007;

email: [email protected]; or,

www: http://www.patton.com.

NOTE: 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

Patton Model 2703. Technical Service hours: 8AM to 5PM EST,

Monday through Friday.

2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product.

This product has been thoroughly inspected and tested and is warrant-

ed for One Year parts and labor. If any questions or problems arise

during installation or use of this product, please do not hesitate to con-

tact Patton Electronics Technical Support at (301) 975-1007.

2.1 FEATURES

• Synchronous network data rate of 2.048 Mbps

• Four selectable terminal rates: 256 kbps, 512 kbps,

1.024 Mbps and 2.048 Mbps

• Supports X.21/EIA-530 (RS-422) and V.35 terminal interfaces

• Both 75 ohm (BNC) and 120 ohm (modular) network terminations

• Internal or receive loop (network) clocking

• Loopback test modes

• Front panel LED indicators for power, network,

master clock and test loop

2.2 DESCRIPTION

The Patton Model 2703 G.703/E1 Digital Modem performs sev-

eral jobs: As a

modem

, the Model 2703 receives unstructured, syn-

chronous 2.048 Mbps data from a G.703 network and sends it to a

router, bridge, multiplexer or other device. As an

interface converter

the Model 2703 accepts 120 Ohm twisted pair or 75 Ohm dual coax

network connections (both types of interfaces provided). Then it con-

verts the signals to X.21/EIA-530 (RS-422) or V.35 (switchable) on an

UD-26 connector.

As a

Rate Adapter

, the Model 2703 lets a lower bandwidth

device–256 kbps, 512 kbps, or 1.024 Mbps–connect to a 2.048 Mbps

G.703 link. The Model 2703 supports internal or network (receive

loop) clocking. Loopback test is built-in, and front panel LEDs monitor

power, network, master clock and test loop. Several power supply

options are available.

3.0 CONFIGURATION

The Model 2703 is equipped with two sets of eight DIP switches

(externally accessible), as well as seven jumpers (internal). These DIP

switches and jumpers allow configuration of clocking, data rate, test

and terminal interface options. The Model 2703 is also equipped with

an internal switch that allows selection of 115 or 230 VAC power inputs

(Note: this switch is not present in Models 2703-UI and 2703-DC).

This section describes switch and jumper locations and explains all

possible configurations.

3.1 EXTERNAL DIP SWITCH SETTINGS

The Model 2703’s DIP switches are located on the underside of

the unit (see Figure 1, below). Figure 2 (below), shows the orientation

of the switch set. All possible settings for the Model 2703’s DIP

switches are presented in the summary table and descriptions on the

following pages. The switches are grouped into two eight-switch sets,

and are externally accessible from the underside of the Model 2703

(See Figure 1).

Figure 2. Close up of configuration switches

OFF

12345678

DHS-8

OFF

Figure 1. Underside of Model 2703, showing external DIP switch locations

12345678

Switch

Set “S1”

Switch

Set “S2”

1 2 3 4 5 6 7 8

OFF

3.1.1 Switch Set S1

The configuration switches on S1 set clocking, rate adaptation,

loopback enable, data invert, and interface (see also Switch S2). The

default settings are summarized in table below.

Switch S1-1: Terminal Interface (Works in Conjunction with

Switch S2)

Set Switch S1-1 (as well as S2-1 and S2-2)to determine whether

the signals passed between the Model 2703 and the terminal device

will follow the EIA-530 (RS-422), CCITT X.21 or CCITT V.35 standard.

If S2-1 and S2-2 are set for “EIA-530/X.21,” then the setting for S1-1

determines which of those two interfaces is selected. Note: If S2-1

and S2-2 are set for “V.35,” switch S1-1 must be set to “off.”

Regardless of the pin-out standard chosen, the physical connector is a

female UD-26.

S1-1 Setting

Off V.35 Interface

On X.21/EIA-530 (RS-422) Interface

S1-2 and S1-3:

Reserved for Future Use

S1 SUMMARY TABLE

Position Function Factory Default

S1-1 X.21/V.35 Off V.35

S1-2

Reserved

Off

S1-3

Reserved

Off

S1-4 Rate Adaptation Off

S1-5 Rate Adaptation Off

S1-6 Data Inversion Off Not Inverted

S1-7 Clock Master/Slave Off Slave

S1-8 Test Enable Off Front Panel

}

2.048 Mbps

Switches S1-4 and S1-5: Rate Adaptation

Set Switches S1-4 and S1-5 together to allow the Model 2703 to

adapt to terminal devices that run at data rates less than 2.048 Mbps

(The network rate remains 2.048 Mbps regardless of the terminal rate

adaptation setting). The setting you select must match the data rate of

your terminal device.

S1-4 S1-5 Setting

Off Off 2.048 Mbps

On Off 1.024 Mbps*

Off On 512 kbps*

On On 256 kbps*

Switch S1-6: Data Inversion

Set Switch S1-6 to determine whether or not the data stream from

the local DTE is inverted within the Model 2703 before being passed to

the G.703 network. You may need to invert the data stream when you

use the Model 2703 with an imbedded G.703 device that inverts the

data on the remote end. Normally, data inversion is not necessary.

S1-6 Setting

On Data inverted

Off Data not inverted

Switch S1-7: Master/Slave Clock

Set Switch S1-7 to allow the Model 2703 to provide the master

clock, or recover the clock from the G.703 network.

S1-7 Setting

On Model 2703 is master

Off Model 2703 is slave, (clock is recovered

from the network)

*NOTE: Revision C. Firmware (or newer, Implemented 6/19/98)

has been adopted to correct signal polarity at 1.024 Mbps, 512

kbps, and 256kbps. To operate Revision. C Firmware units with

Revision B. (or older) units at one of these sub-rates, you must

invert the data (Switch S1-6 On. See Below) (Firmware revision

level is printed on the label on the bottom of the unit).

Switch S1-8: Loopback Test Enable

Depending upon the setting of switch S1-8 the Model 2703 will

either be continually in loopback mode, or loopback mode will be

enabled by pressing and holding the front panel switch. Since the

front panel switch is spring loaded–it returns to “Normal” operation

when pressure is released–this DIP switch provides a way of leaving

the Model 2703 in “unattended” loopback mode for remote test pur-

poses.

S1-8 Setting

On Continual “unattended” loopback mode

Off Loopback activation by front panel switch

3.1.2 Switch Set S2 (To be Used in Conjunction with S1-1)

Set DIP Switches 2-1 and S2-2 in unison to determine the UD-26

terminal interface on the Model 2703. The alternatives are V.35 or

EIA-530/X.21. Switches S2-3 through S2-8 are

Reserved for Future

Use

S2-1 S2-2 Setting

On On V.35 Interface (S1-1 must be “Off”)

Off Off X.21/EIA-530 (RS-422) Interface

(S1-1 must be “On”)

3.2 INTERNAL JUMPER SETTINGS

The Model 2703’s seven jumpers are located on the Network

Interface Module PC board inside the unit. To access the jumpers, fol-

low these instructions:

1. Insert a flat head screw driver into an open slot on either side

of the case. Twist the screw driver head slightly and the top

half of the case will separate from the lower half, as in Figure

3, below.

S2 SUMMARY TABLE

Position Function Factory Default

S2-1 X.21/V.35 On

S2-2 Terminal Interface On

S2-3 thru S2-8

Reserved for Future Use

Off

}

V.35

NOTE: The 9/16” Hex nuts must be removed from the front of the

2703 before the Modeule can be lifted up and removed.

2. Remove the Network Interface Module by lifting gently upward

on it until it comes free from the Model 2703 main PC board.

3. Slide out the Network Interface Module and locate the

jumpers on the bottom side of the board.

4. Configure the jumpers according to the section below and

return the Network Interface Module and cover to their proper

positions.

Figure 4. Jumper locations on Model 2703 PC board.

LK6

LK7

LK5

LK3

LK2

LK4

LK1

Figure 3. Opening the 2703 Case with a Small Screwdriver

The internal jumpers mounted on the Model 2703’s PC board

(labeled LK1 - LK7) are used to configure the 75 ohm or 120 ohm net-

work link parameters. Figure 4 (above) shows the location of the

Model 2703’s jumpers on the internal PC board.

The table below shows the factory default jumper settings.

Following the table are descriptions for each jumper.

NOTE: One combination of jumper settings is required for 75 ohm

operation, and another combination is required for 120 ohm opera-

tion. The Model 2703 is factory configured for 75 ohm operation.)

Jumper LK1: 75 Ohm Transmit Shield-to-Ground Connection

This setting determines whether the shield of the 75 Ohm (coax)

transmit cable is connected to earth ground. This connection must be

made when operating in 75 Ohm (unbalanced) mode. Conversely, this

connection must not be made when operating in 120 Ohm (balanced)

mode.

LK1 Setting

Strap On 75 Ohm TX Shield-to-GND Connection Made

Strap Off 75 Ohm TX Shield-to-GND Connection Broken

JUMPER SUMMARY TABLE

Jumper Function 75 ohm 120 ohm Factory Default

LK1 75 Ohm TX Shield to GND On Off On (connect)

LK2 75 Ohm RX Shield to GND Opt.* Off Off (disconnect)

LK3

Reserved

Off Off Off

LK4 120 Ohm Shield to GND Off Opt. Off (disconnect)

LK5 Configuration Auto-Sense On Opt. On (enabled)

LK6 75 Ohm Input Impedance On Off

LK7 75 Ohm Input Impedance On Off

}

On (75 Ohm)

*Opt. = optional setting, all others are required for proper operation

Jumper LK2: 75 Ohm Receive Shield-to-Ground Connection

This setting determines whether the shield of the 75 Ohm (coax)

receive cable is connected to earth ground. This connection is optional

when operating in 75 Ohm (unbalanced) mode. This connection must

not be made when operating in 120 Ohm (balanced) mode.

LK2 Setting

Strap On 75 Ohm RX Shield-to-GND Connection Made

Strap Off 75 Ohm RX Shield-to-GND Connection Broken

Jumper LK3: Reserved for Future Use

This strap is reserved for future use and must remain Off.

LK3 Setting

Strap On Not a Valid Setting

Strap Off Normal Operation

Jumper LK4: 120 Ohm Shield-to-Ground Connection

This setting determines whether the shield of the 120 Ohm (modu-

lar) cable is connected to earth ground. This connection is optional

when operating in 120 Ohm (balanced) mode. This connection must

not be made when operating in 75 Ohm (unbalanced) mode.

LK4 Setting

Strap On 75 Ohm RX Shield-to-GND Connection Made

Strap Off 75 Ohm RX Shield-to-GND Connection Broken

Jumper LK5: Configuration Auto-Sense

This setting determines whether the host can automatically sense

the configuration of the Applique. The operation of the Applique is not

affected by this jumper setting. Auto-sense should be enabled when

operating in 75 Ohm (unbalanced) mode. Current interface standards

do not list this feature for 120 Ohm (balanced) mode.

LK5 Setting

Strap On Auto-sense enabled

Strap Off Auto-sense disabled

Jumper LK6 & LK7: 75 Ohm Termination Impedance

This jumper sets the termination impedance correctly for 75 Ohm

operation. Both jumpers must be in place when operating in 75 Ohm

(unbalanced) mode. Conversely, both jumpers must be removed when

operating in 120 Ohm (balanced) mode.

LK6 LK7 Setting

On On 75 ohm operation

Off Off 120 ohm operation

3.3 POWER SUPPLY OPTIONS

The Model 2703 is available with three power supply options:

The

Standard

power supply option (Model 2703 or 2703-230) is

factory configured for either 115 or 230 VAC, depending on how

the product is ordered, and is available with a variety of domestic

and international power cords (see Appendix C).

The

Universal Interface

power supply option (Model 2703-UI)

operates in environments ranging from 85 to 265 VAC, with no re-

configuration necessary (see Appendix C for available domestic

and international power cords).

The

power supply option (Model 2703-DC) operates in 48

VDC environments and is equipped with a 3-pin “terminal strip”

style DC power cord.

WARNING! There are no user-serviceable parts in the

power supply section of the Model 2703. Voltage setting

changes and fuse replacement should only be performed

by qualified service personnel. Contact Patton Electronics

Technical support at: http://www.patton.com; or, sup-

[email protected](301)975-1007 for more information.

4.0 INSTALLATION

Once the Model 2703 is properly configured, it is ready to connect

to your system. This section tells you how to properly connect the

Model 2703 to the G.703 network and terminal device interfaces.

4.1 CONNECTION TO THE G.703 NETWORK

The Model 2703 supports 2.048 Mbps communication over an

unstructured G.703 network. Both 120 ohm twisted pair and 75 ohm

coax interfaces are provided on the rear panel of the Model 2703 (see

Figure 5, below). Be sure the unit is configured properly to operate in

either 120 ohm or 75 ohm mode, and that the network connection is

grounded appropriately (see Section 3.0).

4.1.1 TWISTED PAIR (120 OHM) CONNECTION

The Model 2703 is equipped with a single RJ-45 jack for connec-

tion to a 120 ohm twisted pair G.703 network interface. The pinout of

this jack is as follows:

RJ-45 Pins SIGNAL

1 & 2. . . . . . . . . . . . Receive pair (from network)

3. . . . . . . . . . . . . . . Shield reference point

4 & 5. . . . . . . . . . . . Transmit pair (to network)

6. . . . . . . . . . . . . . . Shield reference point

7. . . . . . . . . . . . . . . Not used

8. . . . . . . . . . . . . . . Not used

4.1.2 DUAL COAX BNC (75 OHM) CONNECTION

In addition to the 120 ohm twisted pair connection, the Model 2703

is equipped with dual female BNCs (TX and RX) for connection to a 75

ohm dual coax G.703 network interface.

Figure 5. Model 2703 Rear Panel

(Model 2703-DC has terminal strip)

4.2 CONNECTION TO THE TERMINAL DEVICE

The Model 2703 is wired as a DCE, and–when configured proper-

ly–supports communication with a wide variety of terminal (DTE)

devices. Compatible interface standards include EIA-530 (RS-422),

CCITT X.21 and CCITT V.35.

All interfaces are supported on a female UD-26 connector (a sub-

miniature 26-pin “D” connector designated the “alt A” in the EIA-232

Standard). The various physical/electrical connections mentioned

above are achieved by changing the Model 2703’s DIP switch settings

and attaching different adapter cables.

If you wish to construct your own terminal adapter cable, please

consult the pinout diagram in Appendix B. If you wish to purchase a

terminal adapter cable specifically designed to work with the Model

2703, please refer to the specific Patton part numbers listed in

Appendix C.

4.3 CONNECTION TO THE POWER SOURCE

As described in Section 3.3, the Model 2703 is available with three

power supply options: two AC and one DC. The two AC power supply

options (Standard and Universal) use a female IEC power cord inter-

face, for which Patton can supply various domestic and international

power cords. Please refer to Appendix C for specific Patton part num-

bers when ordering power cords. The DC power supply option uses a

3-pin terminal strip interface (Note: Please refer to the Model 2703

Service Manual for DC power supply wiring instructions).

5.0 OPERATION

Once the Model 2703 is properly configured and installed, it

should operate transparently. This sections describes power-up, read-

ing the LED status monitors, and using the built-in loopback test

modes.

5.1 POWER-UP

To apply power to the Model 2703, first be sure that you have read

Section 3.3, and that the unit has the proper voltage setting and fuse.

Failure to do so could result in damage to the unit and connected

equipment, and may constitute a fire hazard.

Having checked the volt-

age setting, plug the AC power cord into both the Model 2703 and the

AC outlet. Then Power-up the unit using the rear Power switch. Note:

the “Power” LED should glow when power is applied to the unit.

5.2 LED STATUS INDICATORS

The Model 2703 features four front panel LEDs that indicate the

status of power, network connection, master clock and loopback test.

Figure 6 (below) shows the front panel location of each LED.

Following Figure 6 is a description of each LED’s function.

Power Glows red when the Model 2703 is powered up.

Network Glows green when the Model 2703 is receiving

correctly encoded data from the line interface

equipment.

Master Clock Glows green when the Model 2703 is

configured as the master clock unit.

Loop Glows green when the Model 2703 is in

loopback mode.

Figure 6. Model 2703 Front Panel

5.3 LOOPBACK TEST (LAL)

The Model 2703 is equipped with a Local Analog Loopback (LAL)

mode to assist in evaluating the operation of the local Model 2703.

Any data sent to the local Model 2703 in this test mode will be echoed

(returned) back to the user device. For example, characters typed on

the keyboard of a terminal will appear on the terminal screen. To per-

form a LAL test, follow these steps:

A. Activate LAL by moving the front panel toggle switch UP and

holding it in the “Loopback” mode. The “Loop” LED should

glow. Once LAL is activated, the Model 2703 transmit output

is connected to its own receiver.

NOTE: The front panel switch is spring loaded, so it will

return to “Normal” operating mode when pressure is released.

To put the Model 2703 in

continual

loopback mode, for the

purpose of performing a BER test, move DIP switch S1-8 to

the “ON” position (see Section 3.1).

B. Verify that the data terminal equipment is operating properly

and can be used for a test. If a fault is indicated, call a tech-

nician or replace the unit.

C. Perform a BER (bit error rate) test on each unit. If the BER

test equipment indicates no faults, but the data terminal indi-

cates a fault, follow the manufacturer’s checkout procedures

for the data terminal. Also, check the interface cable between

the terminal and the Model 2703.

APPENDIX A

PATTON MODEL 2703 SPECIFICATIONS

Network Interface: G.703

Network Rate: 2.048 Mbps

Network Connectors: Two BNC (75 Ohm) and one

modular RJ-45 connector (120

Ohm)

Terminal Interface: EIA RS-530 (V.36/RS-422), X.21,

V.35 on UD-26

Terminal Rate: 2.048 Mbps;

1.024 Mbps, 512 kbps, 256 kbps

Diagnostics: Loopback Test

Indicators: LEDs for power, network, master

clock and loopback test

Clocking: Internal or network (receive

loop)

Receiver Sensitivity: -10 dB (0dB = 2.4V)

Power: 115/230 VAC (switch selectable),

50/60 Hz; 85-265 VAC, 50/60 Hz

(universal input option); 48 VDC

(option)

Temperature Range: 0-60°C (32-140°F)

Altitude: 0-15,000 feet

Humidity: 5 to 95% non-condensing

Dimensions: 7.3” x 6.6” x 1.62” (185mm x

168mm x 41mm)

Weight: 2.02 lbs.

APPENDIX B

PATTON MODEL 2703 PIN CONFIGURATIONS

13- (CTS/) Clear to Send

12- (TC/) Transmit Clock

11- Not Used

10- (CD/) Carrier Detect

9- (RC/) Receive Clock

8- (CD) Carrier Detect

7- (SG) Signal Ground

6- (DSR) Data Set Ready

5- (CTS) Clear to Send

4- (RTS) Request to Send

3- (RD) Receive Data

2- (TD) Transmit Data

1- Shield

UNIVERSAL D-26 INTERFACE (DCE WIRING)

Not Used -26

Not Used -25

Not Used -24

Data Term Ready (DTR/) -23

Data Set Ready (DSR/) -22

Not Used -21

Data Term Ready (DTR) -20

Request to Send (RTS/) -19

Not Used -18

Receive Clock (RC) -17

Receive Data (RD/) -16

Transmit Clock (TC) -15

Transmit Data (TD/) -14

APPENDIX C

PATTON MODEL 2703

FACTORY PARTS AND ACCESSORIES

C-1 Basic Standalone Units

The Patton Model 2703 standalone digital modem is available in

three versions, depending upon the power supply installed. The

Standard and Universal Interface versions are supplied with a power

cord,

which must be specified in the model number when ordering

The DC version is supplied without a power cord.

All versions of the Model 2703 are supplied without a terminal

(DTE) interface cable. This cable may be ordered separately, or may

be supplied by the user.

Standard power supply option,

switchable between 115 and 230 VAC............................Model 2703/★★

Universal Interface power supply option,

operates in environments ranging from

85 to 265 VAC ............................................................Model 2703-UI/★★

DC power supply option,

operates in 48 VDC environments,

equipped with a 3-pin “terminal strip”

for DC power connection..............................................Model 2703-DC

C-2 AC Power Cords

Power cord must be specified when ordering Models 2703 or

2703-UI. If power cord is omitted, suffix “K” will be assigned.

Ordering Suffix (★★) Power Cord Description

A.....................................Continental Europe, CEE 7

C.....................................reserved, Australia, New Zealand

D.....................................United Kingdom

E.....................................reserved, Denmark

F.....................................reserved, France/Belgium

G.....................................reserved, India

H.....................................reserved, Israel

I ......................................reserved, Italy

J......................................reserved, Japan

K.....................................North America

L .....................................reserved, Switzerland

Example: 2703-UI/D = Universal Interface w/ UK power cord.

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