TC Communications TC1540 User Manual

TC1540

RS-232/RS-422/RS-485

FIBER OPTIC MODEM

User's Manual

MODEL:

S/N:

DATE:

Although every effort has been made to insure that this manual is current
and accurate as of date of publication, no guarantee is given or implied
that this document is error free or accurate with regard to any specifica­tion. TC Communications, Inc. reserves the right to change or modify
the contents of this manual at any time without prior notification.

Notice!

© COPYRIGHT 1992-2007. ALL RIGHTS RESERVED.

TC1540D User's Manual

Rev. 1.2

Table Of Contents

Chapter 1 - Overview ...................................................................................................3

Description.......................................................................................................................................... 3

DIP Switch Functions ........................................................................................................................ 5

LED Functions .................................................................................................................................... 5

Theory of 2 and 4-Wire RS-485 Operation .................................................................................... 6

RS-485 Transition Timer Setup ....................................................................................................... 7

RS-422 & RS-485 Termination Resistor......................................................................................... 7

Pin Assignments and Connection ................................................................................................... 8

Transmission Distances (typical) ..................................................................................................10

Launch Power & Sensitivity ...........................................................................................................10

Power Supply....................................................................................................................................10

Chapter 2 - Installation .............................................................................................. 11

Unpacking the Unit ..........................................................................................................................11

Equipment Location ........................................................................................................................11

Installation Procedure Summary ...................................................................................................11

Installation Example (for 2-wire RS-485 application) ................................................................12

Chapter 3 - Troubleshooting ...................................................................................... 14

General ..............................................................................................................................................14

Power On LEDs Flash .....................................................................................................................14

Alarm Conditions .............................................................................................................................14

Optic Cable Types............................................................................................................................14

Calculating the Loss on the Fiber .................................................................................................14

Chapter 4 - Bench Tests ............................................................................................ 16

General ..............................................................................................................................................16

Testing Considerations ...................................................................................................................16

Bench Test With Built-In Signal Generator..................................................................................16

Optic Loopback Bench Test ...........................................................................................................17

Local Electrical Loopback Bench Test..........................................................................................18

Remote Loopback Bench Test .......................................................................................................19

Chapter 5 - Specifications.......................................................................................... 20

Chapter 6 - Appendix................................................................................................. 21

Return Policy ....................................................................................................................................21

Warranty ............................................................................................................................................21

- 2 -

TC1540D User's Manual

LED Indicators

Optic Transmitter "TxA"

36-72VDC

18-36VDC

10-14VDC

Rev. 1.2

Chapter 1 - Overview

Description

The TC1540 Fiber Optic Modem interconnects a host controller with RTUs (Remote Terminal Units) with
RS-232, RS-422 or RS-485 (2 or 4-wire) interfaces for point-to-point communication. TC1540T is the
extended temperature version of TC1540. Asynchronous data rates up to 500 Kbps are supported (contact
factory for higher data rate requirements). The RS-422/485 interface is standard; RS-232 interfaces are
optional. Different interfaces can be interconnected.

The TC1540 is equipped with eight DIP switches and eight LED indicators (on the top cover) to facilitate
installation and troubleshooting.

Optic options include 850nm and 1310nm Multimode wavelengths; 1310nm or 1550nm Single Mode
wavelengths. The optional optic redundancy feature can provide maximum reliability for crucial applications.

Fiber optic connectors are ST; FC is optional (ST is a trademark of AT&T). The electrical connector is a
removable terminal blocks. Power is 9V to 12V DC at 250mA. Optional power sources are also available
(see Chapter 5 - Specifications).

for Electrical & Optical

Input/Output Status

RS-232 input

terminal block

(only left pin is used)

(only left pin is used)

TCCOMM.COM

RS232

IN

RS-232 output

terminal block

ON(1)

OUT

DIP Switches for Diagnostics

and Application Setup

SIG

GND

+

DC Power Input

9V to 12V DC@250mA

Signal Ground

Optic Receiver "RxA"

Figure 1. TC1540 with RS-232 Interface

- 3 -

TC1540D User's Manual

DC Power Input

9V to 12V DC@250mA

terminal block

DIP Switches for Diagnostics

LED Indicators

Optic Transmitter "TxA"

36-72VDC

18-36VDC

10-14VDC

Rev. 1.2

for Electrical & Optical

Input/Output Status

RS-422/485 input

terminal block

TCCOMM.COM

IN

RS422
RS485

+

ON(1)

OUT

and Application Setup

SIG

GND

+

+

Optic Receiver "RxA"

RS-422/485 output

Signal Ground

(2-wire RS-485)

Figure 2. TC1540 with RS-422/RS-485 Interface

- 4 -

DIP Switch Functions

Set the RS-485 transition timer (see Table 1)

DIP Switch Functions

- RS-422 mode.

Off

(actual logic status on output terminal block depend on electrical interface),

Power Indicator:

SW1 -

Left: Normal Operation

Right: Electrical Local Loopback (for diagnostics)

SW2 -

Internally loopback optic signal

SW3 -

Generate 1Hz blink TD signal to verify optic connectivity

SW4 -

Only used for advanced diagnose, see related section
for detail. It should be kept at left position for normal
operation.

SW5 -

Not used

SW6, SW7, SW8 -

Figure 3. TC1540's DIP Switch Functions

TC1540D User's Manual

Rev. 1.2

LED Functions

Unit's power supply is adequate

On -

Power is not reaching the unit

Off -

Optic Sync Indicators:
Flashing ­On -

Transmit Data Indicator:
(actual logic status on Terminal Block pins depend on electrical interface)
Off:
RS422 - Voltage on “+” terminal > “-” terminal’s voltage.
RS232 - Negative input voltage.

On:
RS422 - Voltage on “+” terminal < “-” terminal’s voltage.
RS232 - Positive input voltage.

Receive Data Indicator:
same logic state as input terminal blocks.

Collision Indicator:
Refer to Chapter 3 - Troubleshooting Section for detail.

Reverse Polarity:

Optic signal lost or below sensitivity level.

Optic signal is valid.

Input

Logic “1” or “Mark” (this is idle state)

Logic “0” or “Space”,

The input RS422/RS485 signal’s polarities are reversed.On -

Figure 4. TC1540's LED Indicator Functions

Driver Mode:

When in RS-485 mode, the output terminals are

On ­ in driver mode

- the output termnal terminals are in receive mode.

Off
RS485/RS422 Mode:

RS-485 mode.

On -

- 5 -

Theory of 2 and 4-Wire RS-485 Operation

Fiber Cable

Figure 5. 2-Wire RS-485 Logic Diagram

TC1540D User's Manual

Rev. 1.2

Two-wire RS-485 is a half-duplex operation, which means transmit and receive operations take turns; they
do not function concurrently. From the user’s point-of-view, the channel is in receiving mode when no data
is transmitted from the remote unit.

Four-wire RS-485 is a full-duplex operation, which means transmit and receive operations function
concurrently. From the user's point-of-view, both channels are in the receiving or transmitting mode at all
times.

The RS-485 Driver/Receiver transition time is determined by three DIP switches on the TC1540. The local
unit's RS-485 transceiver changes to transmit (Tx) mode upon receiving the first bit of data from the remote
unit. The transition time is the amount of time before the local unit's RS-485 transceiver will revert to the
high-impedance receiver mode after the last bit is received from the remote unit. The RS-485 transition time
should be set according to Table 1 on the following page.

Fiber Cable

Figure 6. 4-Wire RS-485 Logic Diagram

- 6 -

TC1540D User's Manual

When SW6,7,8 are all at left side, the electrical interface is set for RS-422

100Kbps

250Kbps

500Kbps

xxxxxxxxx

x

xxx

36-72VDC

18-36VDC

10-14VDC

remove two screws, then remove the top cover

Opening the unit without prior consent from

TCCI will result in voiding the warranty.

Rev. 1.2

RS-485 Transition Timer Setup

The following table provides setup information for configuring the front panel's DIP switches for an RS-485
application. To use the table, determine the baud rate of your application and set SW6, SW7, & SW8
accordingly. For example, if you know the async data baud rate of your application is 9600, then set SW6
to the Right; SW7 and SW8 to the Left (on each unit). You may also want to try the 25Kbps or 50Kbps settings
for a 9600 baud rate as a test to make sure you have the correct data rate (sometimes the best results come
from trial and error). For RS-232 and RS-422 interfaces, these three switches should be kept in the Left
position.

SW-6

SW-7

SW-8

4-wire

RS-422

x
x

10Kbps 25Kbps 50Kbps

400 ms1msec

x

x

x

x

x x

200 ms 100 ms 40 ms 20 ms 4 ms

x

x

x

1Mbps

Table 1. RS-485 Transition Timer Setup Table

RS-422 & RS-485 Termination Resistor

A termination resistor is usually necessary for RS-422 and RS-485 applications. Without proper termination,
the error rate of data transmission may be high due to an "echo" effect on the electrical connection. With
the addition of a termination resistor at the beginning or end of the electrical bus, this echo effect is greatly
reduced. The termination resistors are 100 to 130 ohm resistors located inside the TC1540. Two jumpers,
identified as board locations "W1" & "W5," control the termination resistance on each unit (installed by
default). "W1" controls the resistance for the unit's receiver (IN), while "W5" controls the transmitter's
(OUT) resistance. Proper line termination is required when TC1540 is placed at the end of RS-422/RS-485
bus. There is no termination resistor required for RS-232 applications.

Figure 7. TC1540's Termination Resistor Locations

Note:

W1 W5

OUT

IN

RS422

SIG

RS485

GND

+

+

+

- 7 -

TC1540D User's Manual

RS-422/RS-485 4-Wire Termination/Connection

Transition

Termination

To/From

120

Termination

Drv/Rcv

2-wire RS-485 Termination/Connection

Transition

Termination

To/From

Rev. 1.2

Pin Assignments and Connection

The removable terminal blocks on the TC1540 factory configured as DCE. The pin assignments for each
type of interface are illustrated below. Pins IN(-) & IN(+) are inputs and Pins OUT(-) & OUT(+) are outputs
(or input/output for 2-Wire RS-485).

Ω

W1

120

Resistor

-

+

User's

Device

Tx-

Tx+

IN­IN+

Rx-

Rx+

SIG
GND

OUT-

OUT+

SIG
GND

W5

Ω

Resistor

Rcv

Fiber

-

+

­+

Control

TC1540

Figure 8. 4-wire RS-422/RS-485 Connection/Logic Diagram

User's

Device

Tx/Rx-

Tx/Rx+

SIG
GND

OUT-

OUT+

SIG
GND

W5

Resistor

120

Ω

-

+

Drv/Rcv

Fiber

Figures 9, 2-wire RS-485 Connection/Logic Diagram

Control

TC1540

- 8 -

To/From

User's

IN-

Device

TC1540D User's Manual

Rev. 1.2

Tx

Rx

SIG
GND

OUT­SIG

GND

Fiber

Rs232
Drv/Rcv

TC1540

Figures 10, 2-wire RS-232 Connection/Logic Diagram

- 9 -

TC1540D User's Manual

Rev. 1.2

Transmission Distances (typical)

The TC1540 is compatible with all popular sizes and types of fiber. Transmission distances up to 3km* are
typical over Multimode fiber at 850nm and 4km* at 1310nm. Distances to 35m* are typical over Single Mode
fiber at 1310nm.

Launch Power & Sensitivity

Transmitter: LED/ELED; typical Launch Power - -20dBm* (850nm/1310nm MM, @62.5/125µm)

-16dBm* (1310nm Single Mode, @9/125µm)

Receiver: PIN Diode; typical Sensitivity - -36dBm* (850nm/1310nm MM, @62.5/125µm)

-36dBm* (1310nm Single Mode, @9/125µm)

*Launch power, sensitivity and distance are listed for reference only. These numbers may vary.

Power Supply

Typically, a 9V to 12V DC power supply @250mA is adequate for the TC1540. The power plug is a terminal
block connector with positive & negative polarity indicated on the top panel of the unit. Alternate power
sources are available as an option (see Chapter 5 - Specifications).

- 10 -

TC1540D User's Manual

Rev. 1.2

Chapter 2 - Installation

Unpacking the Unit

Before unpacking any equipment, inspect all shipping containers for evidence of external damage caused
during transportation. The equipment should also be inspected for damage after it is removed from the
container(s). Claims concerning shipping damage should be made directly to the pertinent shipping agencies.
Any discrepancies should be reported immediately to the Customer Service Department at TC Communi­cations, Inc.

Equipment Location

The TC1540 should be located in an area that provides adequate light, work space and ventilation. Avoid
locating it next to any equipment that may produce electrical interference or strong magnetic fields, such as
elevator shafts and heavy duty power supplies. As with any electronic equipment, keep the unit from
excessive moisture, heat, vibration and freezing temperatures.

Installation Procedure Summary

The TC1540 is designed for quick and easy installation. Before installing, however, double-check the polarity
at the DC power's terminal block connector.

A. If power indicator is not on after power is connected then the polarity of DC power connections may be

reversed. Reversed power polarity will not cause any damage to the unit.

B. Connect fiber optic cables between the local & remote units as shown in Figure 12; the local unit's optic

"Tx" connects to the remote unit's optic "Rx".

C. Connect the local device's RS-232, RS-422 or RS-485 signal to the terminal blocks of TC1540. Observe

that all the LED flashes (except "POWER" LED) for 2 to 3 second when power first is applied.

D. Connect the remote device's RS-232, RS-422 or RS-485 signal to the DB25 connector on the rear panel

of a second TC1540. Connect power to the unit. Observe that the "TD" LED flashes when an incoming
signal is transmitted from that unit's local device. Verify that the "RD" LED on the remote TC1540 also
flashes when an incoming signal is received from the remote unit.

E. Run an Optic Loopback, Local Loopback and Remote Loopback Test (see pages 16, 17 & 18) for each

kind of test.

F. Verify System Integrity:

At each unit, check the "O-SYNC" indicator. The "O-SYNC" LED indicateS the optic signal has been
received and synchronized. If the optic cable is broken, the related "O-SYNC" (on the receiving side) will
flash.

Verify and record the optical cable loss for each link in the application after installation is complete. This
reading will both verify the integrity of the circuit and provide a benchmark for future troubleshooting efforts
(see Chapter 3 - Troubleshooting).

- 11 -

TC1540D User's Manual

SW1-4 is off and master TC2100 is in OPERATION mode

2-wire RS-485 Quick Installation

Rev. 1.2

Installation Example (for 2-wire RS-485 application)

Figure 11 depicts a typical 2-wire RS-485 application. The host controller polls the status of the remote RTU
through a 2-wire RS-485 bus. Once the remote RTU receives the polling message, it answers with a response
signal. The communication is half-duplex: the polling device and responding RTU take turns transmitting.

Electrical Interface: 2-wire RS-485
Data Rate: 9600 Baud (Async)
Optic Redundancy: Utilized
DIP Switch settings: SW1, SW2, SW3, SW4, SW5, SW7 and SW8 to Left; SW6 to Right (on both

units)

LEDs to observe: Local & remote unit's "TxD" and "RxD" LEDs should flash in an alternating

pattern (due to half-duplex communication)

(local & remote Units)

Figure 11. 2-Wire RS-485 Installation Diagram

- 12 -

4-wire RS-485 Quick Installation

(local & remote Units)

TC1540D User's Manual

Rev. 1.2

Figure 12. 4-Wire RS-485 Installation Diagram

- 13 -

TC1540D User's Manual

The optic cable is broken or the cable connector is not inserted

The “IN-” and “IN+” are reversed, also maybe “OUT-” and “OUT+”.

Power Indicator:

Rev. 1.2

Chapter 3 - Troubleshooting

General

Alarm conditions occur whenever an optical problem or "fault" condition is detected by the TC1540. Under
normal operation, following LEDs should be lit

"POWER," "O-SYNC," "TD," and " RD."
Following LEDs may be "ON" or "OFF" depend on applications:

"COLL"- for trouble-shoot, not used. It should be off at all times.

"DRVMD"- turned on only when "OUT" terminal blocks are in "driver" mode.

"RS-485"- turned on when TC1540 is configured as RS-485 interface. (see DIP switch settings).

Power On LEDs Flash

When power first applied to TC1540, all the LEDs flah for two to three seconds.

Alarm Conditions

When alarm condition

Unit's power supply is adequate

On -

Power is not reaching the unit

Off -

Optic Sync Indicators:
Flashing -

Optic signal lost or below sensitivity level.

correctly.

Optic signal is valid.

On -

Reverse Polarity:

The input RS422/RS485 signal’s polarities are reversed.

On -

Optic Cable Types

Conventionally, fiber optic cable with yellow-colored insulation is used for Single Mode applications; gray
or orange-colored insulated cable is for Multimode use. If Multimode cable is used in a Single Mode
application, the test results could be erroneous and confusing.

Calculating the Fiber Optic Loss Budget

The fiber optic link and/or connectors are frequently the source of various problems. Check out the
connectors and the integrity of the link first. Ideally, the link should be calibrated for total loss after the
installation has been completed.

To calculate the loss budget:

Multimode 850nm : 3 dB loss per km on 62.5/125µm cable*
Multimode 1310nm : 2 dB loss per km on 62.5/125µm cable*
Single Mode 1310nm : 0.5 dB loss per km on 9/125µm cable*
Single Mode 1550nm : 0.4 dB loss per km on 9/125µm cable*

- 14 -

TC1540D User's Manual

Conduct a

Test from

Direction

Yes

Does the "TD"

LED Light when

Check Pin

Assignments

ination Resistor,

Conduct a Local

(-13dBm to -22dBm)

Conduct an Optical

(-13dBm to -37dBm)

Check Signal

Polarity and

DIP Switches

Yes

Contact

Factory for

Replacement

Rev. 1.2

The TC1540 is designed with easy troubleshooting in mind. The LED indicators and DIP switches on the
top cover will support various diagnostic functions. The first step in troubleshooting is to determine whether
the problem is optical or electrical in nature. Figure 12 describes the steps required to isolate the problem.
The tests related to each block are explained in Chapter 4 - Bench Tests.

Check Power

Source, Polarity &

Power Connection

Check Optic Cable

Type, Connectors,

and Verify Optic

Connections

No

Pass

Is the unit's

Power LED Lit ?

Check Term-

DIP Switches &

Signal Polarity

Loopback Test

Fail

Transmitting?

No

Conduct a Signal

Generator Test

Measure Optical

Launch Power

Measure Optical

Receive Power

Loopback Test

Repair or

of Unit

Fail Fail

Conduct a

Pass

Remote

Pass

Loopback Test

Figure 13. Troubleshooting Flowchart

Remote

Loopback

Opposite

- 15 -

TC1540D User's Manual

TC1540

TC1540

RxD

TxD

Set Sw5 to right

(Remote loopback)

Rev. 1.2

Chapter 4 - Bench Tests

General

It is highly recommended to conduct bench tests before actual installation. Bench testing allows the user to
become familiar with all the functions and features of the TC1540 in a controlled environment. Knowledge
of the TC1540's functions and features will ease installation and troubleshooting efforts later on.

Testing Considerations

Most of the following bench tests specify a BERT (Bit Error Rate Tester) Test Set be used to perform the
test. You may substitute the BERT with a PC (with a terminal emulation program that matches your devices
RS-232, RS-422, or RS-485 interface) if necessary. For RS-485 interfaces, make sure the baud rate on the
BERT or PC matches the baud rate DIP switch settings (SW6, SW7 and SW8) on the units tested.

The connection diagrams in this chapter are typical for all three types of interfaces; however, the DIP switch
settings will vary depending on the type of interface, baud rate, and whether your unit is a single or dual optic
model. The loopback tests can not be performed on a TC1540 unit with a 2-wire RS-485 interface due to
its half-duplex operation; however, the Signal Generator feature can be used to facilitate troubleshooting.
The DIP switch illustrations on each unit are typical for a dual optic TC1540 with a 4-wire RS-485 interface
communicating at 9600 baud rate (Async).

Bench Test With Built-In Signal Generator

The TC1540 has a built-in signal generator to simulate a polling device's or RTU's incoming electrical signal.
The built-in signal generator is a pulse signal indicated by a blinking LED. The flash rate is intentionally
reduced for easy visual confirmation.

1. Set up the bench test as shown in Figure 14. At the local TC1540 unit, turn on the "SIGGEN" by sliding
SW3 to the Right. The "TD" LED on the local TC1540 should start blinking. Likewise, the "RD" LED

on the remote TC1540 should also blink, indicating receipt of the local unit's simulated polling message.

2. At the remote TC1540, turn on the "SIG-GEN" by sliding SW3 the Right. The "TD" LED should start
blinking. Verify that the local unit's "RD" also blinks, indicating receipt of the remote unit's simulated
response.

Optic Cable

TxD

RxD

RS-232

Set SW3 to left

Figure 14. Signal Generator Bench Test Connection Diagram

- 16 -

TC1540D User's Manual

Connect TC1540 to RS-530 DTE device

SIG

GND

TC1540

Optical loopback

Connect TC1540 to RS-449 DTE device

SIG

GND

Rev. 1.2

Optic Loopback Bench Test

Purpose: This test loops the optic signal transmitted by the TC1540 back to the unit's receiver in

order to test the transmit and receive capabilities of the unit without any other units
attached.

Equipment
Requirements: One (1) Bit Error Rate Test (BERT) Set with appropriate interface module.

One (1) optical jumper cable (patch cord) with appropriate connectors.

Procedure: Set up the bench test as shown in Figure 15. To test the "Tx" to "Rx" loop, connect an

optic patch cord from optic "Tx" to optic "Rx." Set all the DIP switchs to the Left position.
Connect a BERT tester to the TC1540 according to Fig. 15. Set the tester up as a DTE
device. The BERT tester should indicate a "SYNC" signal.

Remove the patch cord from "Tx" and "Rx", the "O-SYNC" LED on the TC1540 should
flash.

RS-530

DTE DEVICE

(DB25)

Tx-

Tx+

Rx-

Rx+

SIG
GND

TC1540

2

14

3

16

7

IN-

IN+

OUT-

OUT+

RS-449

DTE DEVICE

(DB37)

Tx-

Tx+

Rx-

Rx+

SIG
GND

4

22

6

24

19

Figure 15. connect TC1540 to RS-530 or RS-449 Devices

Rx

Tx

BERT

or

ASCII Terminal

All the SW to the left

RS-422
485/232

TC1540

IN-

IN+

OUT-

OUT+

Figure 16. Optic Loopback Bench Test Connection Diagram

- 17 -

TC1540D User's Manual

TC1540

Local loopback

to/from TTL conversion

Connect TC1540 to RS-530 DTE device

SIG

GND

Connect TC1540 to RS-232 DTE device

SIG

GND

Connect TC1540 to RS-449 DTE device

SIG

GND

Rev. 1.2

Local Electrical Loopback Bench Test

Purpose: This test loops the incoming RS-232, RS-422 or RS-485 electrical signal back to the

output terminal blocks in order to verify the cable connections, the electrical interface
driver, signal polarity (for RS-422/RS-485) and the receiver's Integrated Circuitry.

Equipment
Requirements: One (1) Bit Error Rate Test (BERT) Set with appropriate interface module.

Procedure: Set up the bench test as shown in Figure 15. Set SW1 (LOCLB) to the Right position.

Connect a BERT tester to the IN(-) and IN(+) terminal blocks. Set the tester up as a
DTE device if RS-530 or RS-449 interface is used. "TD" and "RD" LEDs should light
on the TC1540, indicating the status of the looped signal. The BERT tester should
indicate a "SYNC" signal. This test should be performed on each individual unit in the
application.

RS-530

DTE DEVICE

(DB25)

RS-449

DTE DEVICE

(DB37)

Tx-

Tx+

Rx-

Rx+

SIG
GND

Tx+

Rx-

Rx+

SIG
GND

Tx-

TC1540

2

14

3

16

7

IN-

IN+

OUT-

OUT+

TC1540

4

22

6

24

19

IN-

IN+

OUT-

OUT+

RS-232

DTE DEVICE

(DB25)

Tx-

Rx-

SIG
GND

To BERT tester

2

3

7

RS-232,RS-422,RS-485

SW1 to right

TC1540

IN-

OUT-

Figure 17. Local Loopback Bench Test Connection Diagram

- 18 -

TC1540D User's Manual

TC1540

TC1540

RxD

TxD

Set Sw5 to right

(Remote loopback)

Rev. 1.2

Remote Loopback Bench Test

Purpose: This test loops the composite optical & electrical signal at the remote unit back to the local

unit (via fiber) in order to test each unit's optic functions and LED indicators and to verify
the integrity of the fiber optic link.

Equipment
Requirements: One (1) Bit Error Rate Test (BERT) Set with appropriate interface module.

At least two (2) optical jumper cables (patch cords) with appropriate connectors.

Procedure: Set up the bench test as shown in Figure 16. On the remote unit, set SW2 (RMTLB)

to the Right position and connect a BERT tester to the local unit. Set the tester up as
a DTE device (refer Fig. 15 for DTE device connection). The "TD" and "xD" LEDs (on
both TC1540 units) should light, indicating the status of the looped signal. The BERT
tester should indicate a "SYNC" signal. This test can be performed from either (or both)
direction(s).

BERT

or

ASCII Terminal

Figure 18. Remote Loopback Bench Test Connection Diagram

Optic Cable

TxD
RxD

RS-232

Set SW3 to left

- 19 -

Chapter 5 - Specifications

Data Rates

Async .................................................................................................. up to 500 Kbps**

Optical

Transmitter ...................................................................................................... LED/ELED

Receiver ..........................................................................................................PIN Diode

Wavelength ............................................................................ 850nm/1310nm Multimode

....................................................................................................... 1310nm Single Mode

Fiber Optic Connectors .................................................................... *ST (FC optional)

Loss Budget ........................................... 15dB Multimode 850nm/1310nm @62.5/125µm

............................................................................20dB Single Mode 1310nm @9/125µm

Electrical

Connector .......................................................................... Removable Terminal Blocks

Interface ................................................ (DCE) RS-232, RS-422, or (2 or 4-wire) RS-485

TC1540D User's Manual

Rev. 1.2

System

Bit Error Rate ........................................................................................ 1 in 109 or better

Visual Indicators ............................. POWER, O-SYNC, TD, RD, COLL, DRVMD, RS485,

Power Source

(standard) ...............................................................................................12VDC@250mA

(optional) ................................................................................ 24VDC@125mA(optional)

(optional) .................................................................................................. 48VDC@65mA

(optional) ........................................................... 115 or 230VAC with external power cube

Temperature

Operating ..................................................................................................... -10oC to 50oC

Operating (extend temperature version TC1540T).......................................... -20oC to 70oC

Storage ........................................................................................................ -40oC to 90oC

Humidity........................................................................................... 95% non-condensing

Physical

Height ......................................................................................................... (2.80 cm) 1.1"

Width ........................................................................................................ (12.75 cm) 5.0"

Depth .......................................................................................................... (8.0 cm) 3.15"

Weight ..................................................................................................... (180 gm) 5.1 oz

*ST is a trademark of AT&T

**Contact factory for higher data rate requirements

- 20 -