Telesto Private Wire User Manual

Telesto Private Wire Modem

Manual

Telesto P rivate Wire Modem Manual

Revision History

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Rev Date Author Description

A May 6, 2002 R. Catalfamo Initial release.

Approval: ________________________________

Configuration

Theory of Operation

Table of Conten ts

Telesto Private Wire Modem 1

1. Introduction

2. Organization of this Manual

3. Unpacking & Post Delivery Inspection

4. Technical Description

5. Servicing

Basic troubleshooting ........................................................................................

Appendix A - Connector Pinouts

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............................................................

.....................................................................................

.........................................................................................

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Appendix B - Outline and Installation Drawing

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3

5

7

9

9Overview of the Hardware ...................................................................................

9

11

15

17

19

Appendix C - Technical Specifications

...............................................................

21

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1. Introduction

Telesto Private Wire Modem 3

Telesto Private Wire Modems work in conjunction with Europa digitisers, greatly extending the
aperture of Nanometrics ter restrial Callisto networks.

It is strongly recommended that you read the entire manual before commencing testing,
configuring, or using the Telesto. On the following pages you will find a wealth of information
regarding all aspects of the Telesto modem. Please read the instructions carefully.

If you have problems or need technical support, please submit requests for technical support by
e-mail or fax. When communicating your problem to us please give as much information as
possible and inclu de "evidence" of the problem. This allows us to reproduce the pro blem in our
laboratories and to find a solution to your problem.

Introduction

by e-mail: [email protected]
by fax: To: Support at fax [phone]
by phone: Please ask for Support at [phone]

Nanometrics Inc.

250 Herzberg Road

Kanata, Ontario Canada

K2K 2A1

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Telesto Private Wire Modem 5

Organization of this Manual

2. Organization of this Manual

This manual is organized in these major sections:

Chapter 1 Introduction Introductory notes to this manual.
Chapter 2 Organization of this Manual Notes on how to use this manual.
Chapter 3 Unpacking and Identifies components and

Post Delivery Inspection references an "as-shipped" section.

Chapter 4 Technical Description Description of features

Chapter 5 Servicing Recommended maintenance and

Appendices These list pin connections, outline & installation drawings and the Telesto

Private Wire Modem Technical Specification

and technical specifications.

repair procedures.

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Telesto Private Wire Modem 7

Unpacking & Post Delivery Inspection

3. Unpacking & Post Delivery Inspection

Open and inspect the shipment for possible damage. Carefully check each item for damage or
defects. The following list includes items generally included with the Telesto modem. This list can
vary from application to application. To determine the exact list of items included in your shipment
refer to the shipping documents.

The system may include one or more of the following:

1. Telesto Private Wire Modem

2. Power cable

3. Telesto Private Wire Modem Manual

4. As-shipped Sheet

5. OEM Modem Manual

Checking the As-Shipped Sheets

Please study the as-shipped data sheet to determine the exact configuration of the Telesto modem .
The as-shipped sheet lists the serial numbers of the parts shipped and the exact configuration of
the parameters associated with your hardware. This determines how your Telesto modem operates
when first powered-on and how it functions within your network.

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Technical Description

Telesto Private Wire Modem 9

4. Technical Description

Overview of the Hardware

The Telesto Private Wire Modem is the interface at a remote seismic site between the Nanometrics
Europa digitiser and the telephony communications network. The Europa digitises analog seismic
signals, packages and outputs this information in the form of a serial data stream of a proprietary
format. The Telesto modem integrates all the hardware necessary to receive data from the Europa
digitiser and sends these data to the network central site. It also provides for the reverse flow of
data by receiving various network management information from the central site and passing it to
the Europa digitiser. Optionally, the Telesto Private Wire Modem provides power to its associated
Europa digitiser . The general function of the Telesto is shown in Figure 1.

Optional 12 VDC out (to Europa Digitiser)

POWER

24 VDC in (from external power supply)

Theory of Operation

The two main functions of the Telesto modem are to interface the data from the Europa digitiser to
the leased-line telephony network and, optionally, to supply power to the Europa digitiser. The
functions are performed by a Printed Circ uit Board (PCB) mounted inside the Telesto enclosure .
This PCB contains two principal components - a modem and three DC/DC converters. Other
ancillary comp onents include flex circuits which interface the PCB to the Telesto front panel
connectors. The main functions are described below.

TELESTO

PRIVATE WIRE

MODEM

RS-232 serial data (to/from Europa Digitiser)

DATA

Telephony traffic (to/from leased-line telephone network)

Figure 1: Telesto Private Wire Modem, General Function

Interfacing serial data to the leased-line telephony network

The serial data stream produced by the Europa digitiser uses an RS-232 physical layer protocol.
This format is not suitable for transmission over a leased-line telephone network because of signal

Technical Description

Telesto Private Wire Modem 10

levels, voltages , bit duration, etc. In order to efficiently couple the RS-232 data to the telephone
network a device known as a modem (MOdulator/DEModulator) is used to transform the RS-232
digital data into an analog signal which can be efficiently carried on the telephony channel. By
varying the properties of the analog signal such as signal amplitude, phase and duration, one can
efficiently pack the RS-232 data onto the telephony channel. The telephony channel then carries
the data traffic to the eventual destination. At the receiving end (in this case, the central station)
the telephony signal is transformed back to RS-232 format which can then be used by DTEs (Data
Terminal Equipment) such as computers and data processing equipment.

Therefore, the Telesto modem at a remote site must be paired with a corresponding modem at the
central site. Both of these units perform the same function - they transform the local data stream to
a form suitable for transmission on the leased line tel ephone network. Because data flow can occur
in both directions, i.e., to/from a remote site, the Telesto private wire modem is a full-duplex device.
This allows seis mic data to be sent continuously to the central data acquisition site while also
providing a return path for retransmission requests from the central site.

Both the remote site Telesto modem and its counterpart at the central site perform error detection
and correction which may have been caused by noise on the telephone channel. This function is
performed transparently, i.e., neither the Europa digitiser nor the central site data acquisition
equipment have knowledge of this real-time error correction.

The Telesto modem has been designed to require no “handshaking” between itself and the data
device connected to it, e.g., Eu ropa digitiser. Only 3 signal lines are necessary to transmit/receive
data over the leased-line telephone network with the Telesto; thes e are Tx (Transmit), Rx (Receive)
and GND (Ground). Data to be transmitted is simply placed on the Tx line while data to be received
is obtained by monitoring the Rx line; GND serves as an electrical return path.

Power Conversion (Optional)

Because the available power at the remote site is 24 VDC, the Telesto Private Wire Modem
converts this voltage to a 12 VDC level re quired by the Europa digitiser. As well the Telesto’s
internal electronics require differe nt voltage levels. The power conversion is accomplished inside
the Telesto with the use of 3 DC/DC converters. These solid state devices provide 15 VDC, 12 VDC
and 5 VDC. The 12 VDC is made available to the Europa Digitizer via a MIL connector on the front
panel of the Telesto enclosure.

Configuration

Telesto Private Wire Modem 11

The Telesto Private Wire Modem requires configuration in order to properly integrate it into the
seismic network. This config uration assumes that the telephone network is a 4-wire leased line
system. Because the Telesto Modem at the remote site is paired with a corresponding unit at the
central site, it is important to configure the remote site Telesto Modem in ANSWER mode (the
central site modem, in this case, is in ORIGINATE mode). Both the hardware and firmware
configurations are detailed below.

Hardware Configuration

Inside the Telesto Private Wire Modem can be found a telephone modem PCB (model Multitech,
MT2834BLRe) as shown in Figure 2. The PCB has two dip switches containing a total of 16
switches which must be configured as in Table 1.

Technical Description

TELEPHONE MODEM

PCB

switches

13 to 16

13 1

Figure 2: DIP Switch Location on Telephone Modem PCB

switches

1 to 12

OPENOPEN

No.

Telesto Private Wire Modem 12

6

8

Technical Description

TELEPHONE MODEM DIP SWITCH SETTINGS

FunctionDIP Switch

DOWNUP

Maximum throughput
enabled

Command modem
disabled

Table 1: DIP Switch Settings (UP = OPEN, DOWN = CLOSED)

disabled

enabled

Manufacturer’s
Default

Telesto
Modem

downdownDTR forcedDTR from interface1
downupFlow control di sabledFlow control enabled2
downdownTx level = -9dBTx level = -15 dB3
upupUUCP enabledUUCP disabled4
downupAnswerOriginate5
upupMaximum throughput

downdownRTS forced onRTS normal7
downdownCommand modem

downdownRemote loopbackLocal loopback9
downupLeased lineDial-up10
downdownMT result codesAT result codes11
downdownAsynchronousSynchronous12
upupSee note belowSee note below13
upupSee note belowSee note below14
upupCD forced onCD from interface15
downdown4-wire2-wire16

NOTE:
Baud Rate(kbps) Switch 13 Switch 14

28.8 UP UP

19.2 DOWN UP

14.4 UP DOWN

9.6 DOWN DOWN

Firmware Configuration

Firm ware configuration allows the user to tailor such configurable param eters as data port rate, flow
control, error correction, etc. In this application, as a point-to-point private wire modem, the
following settings are required. The Telesto Private Wire Modem is shipped with this
configuration. The firmware configuration procedure is given below.

1. Ensure that the Telesto Private Wire Modem is undowered.

2. Remove the cover and gain access to the telephone modem PCB inside the Telesto Private
Wire Modem.

3. Configure the DIP switches as described above.

4. Change dip switch 10 to UP position.

Serial port data rate = 9600 bps

$

sb9600

Data compression disabled

&e14

No flow control

&e3

No error correction

&e0

Function

AT Command

TELEPHONE MODEM “AT” COMMAND SETTINGS

Technical Description

Telesto Private Wire Modem 13

5. Connect the comms port of the Telesto Private Wire Modem to the serial COM port of a PC or
laptop computer.

6. Start a terminal emulator, e.g., ZOC, on the computer and configure it to the correct COM port.

7. Power up the Telesto Private Wire Modem.

8. Type in the following command (this is a sequence of “AT” commands) at the terminal
emulator:

at&e0&e3&e14$sb9600&w0

The modem should reply with: OK (displayed by the terminal emulator).

9. Reset the modem by typing atz in the terminal emulator. The modem should reply with: OK.

10. Type in atl5 at the terminal emulator. The modem will display the configured parameters.
Ensure that the above commands have configured the parameters correctly as shown in Table

2.

11. Power down the Telesto Private Wire Modem.

12. Change dip switch 10 to DOWN position.

13. The firmware has now been configured; reassemble the Telesto Private Wire Modem.

Table 2: Telephone Modem “AT” Command Settings

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5. Servicing

Telesto Private Wire Modem 15

Basic troubleshooting

The Telesto Private Wire Modem is always used as part of a network containing Europa digitisers.
Therefore troubleshooting the Telesto usually involves setting up some combination of
(digitiser,Telesto Modem,central site) equipment under laboratory conditions. In this manner the
commas port of the Telesto Modem can be checked for data continuity which is sufficient proof
that the Telesto Modem is operational.

Before you attempt any troubleshooting check all the connections, batteries and fu ses to rule out
the possibility that the malfunctioning is due to one of these items .

Unable to communicate with the Telesto Modem

If the Telesto Modem fails to send any data or, during firmware configuration, the terminal emulator
menu appears inaccessible on power-up, check both the settings of the terminal emulator and the
Telephone Modem PCB firmware. In most cases the cause is either a mismatch in baud rate settings
or the AT command settings in the modem PCB firm ware are incorrect.

Disassembly and Reassembly

There are two paired boards within the Telesto. The objective is to troubleshoot to the board level
and replace these boards. Attempt to identify the faulty PCB board pair by swapping in the
corresponding board pair from a working unit. The necessary tools are:

1. Phillips screwdriver.

2. Allan key 3 mm for socket head cap screws.

Servicing

Disassembly Instructions

1. Disconnect all the cables from the Telesto.

2. Remove the screws around the edge of the front plate of the enclosure box and pull

out the electr onics tray using two of the face plate connectors..

3. Remove the sma ller board by first unscrewing the only screw on the board and then
pulling out the board away from the edge connector.

4. Remove the other board by 1.unscrewing the 4 screws to the flex circuits attached to
the front panel connectors, 2. Pulling off each flex circuit from the board connector, 3.
unsrewing the 7 screws holding this board to the chassis .

Assembly Instructions

The assembly instructions are the reverse of the disassembly instruction. Make sure that the
repaired unit has the same configuration parameter values as the previously faulty unit. Refer to the
as-shipped sheets for the configuration parameters. After power up , check the following:

} The telephone PCB firmware menu is accessible.
} The Europa Digitiser is transmitting data.
} Re-requested packets from the central site are received by the central site.

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Appendix A - Connector Pinouts

Dgnd

T

Shield

SHD

leased 4

C

Earth

B

Earth

B

Telesto Private Wire Modem 17

RDH
TDG

Table 1: Comms Connector Pinout

leased 1A
leased 2 (Dial 1)B

leased 3 (Dial 2)D

Table 2: Leased Line Connector Pinout

Signal NamePin Number

Signal NamePin Number

Signal NamePin Number

Battery+A

Battery-C

Table 3: Input Power Connector Pinout

Signal NamePin Number

Battery+A

Battery-C

Table 4: Output Power Connector Pinout

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Appendix B - Outline and Installation Drawing

Telesto Private Wire Modem 19

Appendix C - Technical Specifications

Telesto Private Wire Modem 20

Description

The Telesto Private Wire Modem is an interfacing unit between an RS232 line and an analog
private wire line (dedicated telephone line). At one end it connects to the serial data port (port 2) of
the Callisto Europa digitiser and at the other end to a 2 or 4 wire analog telephone line. The Telesto
is powered from a 24 Vdc power source and provides 12 Vdc to the Callisto Europa digitiser.

Specifications

Power Consumption 15 W (Typical)
Supply voltage 24 Vdc
Voltage Range 22-26 VDC
Surge Level no voltages above +/- 30 VDC

Interfaces

To Callisto Europa: RS232 with RTS/CTS data flow control
To telephone line: analog private wire on 2 or 4 wires

Baud rate: 19.2K and below
Standards: Data: Enhanced V.34, V.34, V.32bis, V.32,

V.22bis
Error Correction: V.42
Data Compression: V.42bis, MNP® 3 & 4

& Class 5

Environment

Housing Rugged waterproof aluminum enclosure
Size 469.9 mm L x 279.4mm W x 137.2mm H (18.50" L x 11.00"

W x 5.40" H)
Weight 3 kg (6 lbs)
Connectors RS-232, 19 pin cicular

Power, 3 pin

Telephone line, 4 pin circular
Environment meets or exceeds protected outdoor specification, see

Nanometrics document 13065

Included Parts

Telesto Private Wire Modem 21

Telesto Private Wire Modem
Power Mating connector

Notes

1. See Nanometrics document 13005 for physical characteristics.

2. The unit must be properly grounded with a ground wire connected to the grounding lug

on the front panel.