Leader LT 4448 User manual

LT 4448
CHANGEOVER
Instruction Manual
Thank you for purchasing.
Please carefully read this instruction manual and the included "GENERAL SAFETY SUMMARY".
Please use the product safely.

TABLE OF CONTENTS
GENERAL SAFETY SUMMARY .........................................................................................I
1. INTRODUCTION........................................................................................................1
1.1 Scope of Warranty.....................................................................................................................1
1.2 Trademark Acknowledgments...................................................................................................1
1.3 Operating Precautions...............................................................................................................2
1.3.1 Power Supply Voltage........................................................................................................2
1.3.2 Maximum Allowable Input Voltage.....................................................................................2
1.3.3 Mechanical Shock..............................................................................................................2
1.3.4 Electrostatic Damage.........................................................................................................2
1.3.5 Warming Up........................................................................................................................2
2. SPECIFICATIONS......................................................................................................3
2.1 General......................................................................................................................................3
2.2 Features.....................................................................................................................................3
2.3 Specifications ............................................................................................................................5
2.3.1 Compliant Standards..........................................................................................................5
2.3.2 I/O Connectors...................................................................................................................5
2.3.3 I/O Characteristics..............................................................................................................6
2.3.4 Input Signals.......................................................................................................................7
2.3.5 Signal Switching.................................................................................................................7
2.3.6 Fault Detection...................................................................................................................8
2.3.7 Alarm Detection..................................................................................................................9
2.3.8 Key Lock.............................................................................................................................9
2.3.9 External Control Connectors............................................................................................10
2.3.10 General Specifications.....................................................................................................11
3. PANEL DESCRIPTION.............................................................................................12
3.1 Front Panel..............................................................................................................................12
3.2 Rear Panel...............................................................................................................................13
3.3 Top Panel.................................................................................................................................14
4. HOW TO USE...........................................................................................................15
4.1 Attaching Rack Supports.........................................................................................................15
4.2 Connecting and Disconnecting the Power Cord.....................................................................16
4.3 Turning the Power On.............................................................................................................17
4.4 Turning the Power Off .............................................................................................................17
4.5 DIP Switch Settings.................................................................................................................18
4.5.1Setting Method.................................................................................................................20
4.5.2 Setting the channel 1 to 11 input signals.........................................................................20
4.5.3 Setting the LTC Input Signal and OutputAlarm Indication..............................................22
4.5.4 Setting the Fault Detection Speed...................................................................................23
4.5.5 Setting the Fault Detection Reference.............................................................................25

4.5.6 Setting the Fault Detection Level (User-defined).............................................................26
4.5.7 Setting the Operation Mode, Standby Time and Fault information .................................27
4.6 Ch1 to 11 Signal I/O................................................................................................................29
4.7 LTC Signal I/O.........................................................................................................................30
4.7.1 LTC Connection Cables (LC 2183 sold separately) ........................................................31
4.8 LT 4448 Configuration.............................................................................................................33
4.8.1 Setting the Key Lock........................................................................................................33
4.8.2 Switching the Output Signal.............................................................................................33
4.8.3 Setting Automatic Signal Switching .................................................................................34
4.8.4 Switching the Control.......................................................................................................36
4.9 LT 4448 Indications .................................................................................................................37
4.9.1 Fault Indication.................................................................................................................37
4.9.2 Alarm Indications..............................................................................................................38
5. REMOTE CONTROL................................................................................................ 39
6. ETHERNET CONTROL............................................................................................ 42
6.1 SNMP Configuration Software ................................................................................................42
6.1.1 Installation........................................................................................................................42
6.1.2 Uninstallation....................................................................................................................45
6.1.3 Connection.......................................................................................................................46
6.1.4 Window Explanations.......................................................................................................47
6.2 SNMP ......................................................................................................................................49
6.2.1 SNMP Version..................................................................................................................49
6.2.2 Control Items....................................................................................................................49
6.2.3 SMI Definitions.................................................................................................................49
6.2.4 Notes on Updating ...........................................................................................................49
6.2.5 HOW TO USE ..................................................................................................................50
6.2.6 Enterprise MIB..................................................................................................................51
6.2.7 Extended TRAP (Variable Binding List)...........................................................................61
6.3 HTTP Server Feature..............................................................................................................63
6.3.1 Operating Environment....................................................................................................63
6.3.2 Precautions ......................................................................................................................63
6.3.3 HOW TO USE ..................................................................................................................64

I
GENERAL SAFETY SUMMARY
■Read This before Using the Instrument
This instrument should only be used by persons with sufficient knowledge of electronics who
thoroughly understand the contents of this manual.
This instrument is not designed or manufactured for households or ordinary consumers.
If unqualified personnel are to use the instrument, be sure the instrument is handled under the
supervision of qualified personnel (those who have electrical knowledge). This is to prevent the
possibility of personal injury or damage to the instrument.
■Note about Reading This Manual
The contents of this manual contain specialized terminology and may be difficult to understand. If
you have any questions about the contents of this manual, please contact your local LEADER
agent.
■Symbols and Terms
The following symbols and terms are used in this instruction manual and on the instrument to
indicate important warnings and notes.
<Symbol> This symbol appears in this instruction manual and on the instrument to indicate an area
where improper handling could result in personal injury, damage to the instrument, or
malfunction of the instrument or devices connected to it.
When you encounter this symbol on the instrument, be sure to refer to the information in
this instruction manual that corresponds to the area that the symbol marks.
<Term> Ignoring the precautions that this term indicates could lead to death or serious injury.
<Term> Ignoring the precautions that this term indicates could lead to personal injury or damage
to the instrument.

II
GENERAL SAFETY SUMMARY
Read the warnings and information below thoroughly to avoid death, personal injury, and damage and
deterioration of the instrument.
■Warnings Concerning the Case and Panels
Do not remove the instrument's case or panels (except for DIP switch cover) for any reason
except for setting DIP switches. Touching the internal components of the instrument could lead
to fire or electric shock.
Also, do not allow foreign materials, such as liquids, combustible matter, and metal, to enter
the instrument. Turning the instrument on when such materials are inside it could lead to fire,
electric shock, damage to the instrument, or some other accident.
■Installation Environment
● Operating Temperature Range
Use this instrument in a 0 to 40 °C environment. Using the instrument in a high temperature
environment could lead to fire.
Drastic changes in temperature, such as might be caused by moving the instrument
between two rooms with different temperatures, can damage the instrument by causing
condensation to form within it. If there is a possibility that the instrument has condensation
within it, wait for approximately 30 minutes before turning on the power.
● Operating Humidity Range
Use this instrument in an environment whose relative humidity is 90 %RH or less where
there is no threat of condensation forming.
Also, do not operate this instrument with wet hands. Doing so could lead to electric shock or
fire.
● Do Not Operate in an Explosive Atmosphere
Using this instrument in an environment where flammable gasses, explosive gasses, or
steam is emitted or stored could lead to an explosion or fire. Do not use the instrument in
such an environment.
● Do Not Insert Foreign Materials
Do not insert foreign materials, such as metal and flammable objects, through the vents or
allow liquid to enter the instrument. Such acts can lead to fire, electric shock, damage to the
instrument, or some other accident.
■If You Notice Something Wrong during Operation
If you notice smoke, fire, a strange smell, or something else that is wrong with the instrument
while you are operating it, stop operation immediately. Failing to do so could lead to fire.
Remove the power cord from the outlet. After making sure that fire has not spread anywhere,
contact your local LEADER agent.

III
GENERAL SAFETY SUMMARY
■Warnings Concerning the Power Source
Do not use a power source with a voltage other than the rated power source voltage for the
instrument. Doing so could lead to fire.
Confirm the voltage of the power source before you connect the power cord to it.
Only use a power source whose frequency is 50/60 Hz.
Use a power cord that is appropriate for the voltage of the power source. Also, use a power
cord that meets the safety standards of the country that you are using it in.
Using a power cord that does not meet the standards could lead to fire. If the power cord is
damaged, stop using it, and contact your local LEADER agent. Using a damaged power cord
could lead to electrical shock or fire.
When removing the power cord from the power outlet, do not pull on the cord. Pull from the
plug.
■Warnings Concerning Grounding
The instrument has a ground terminal to protect the user and the instrument from electric
shock. Ensure that the product is properly grounded for safe operation.
■Warnings Concerning the Panel
Sections of the panel are made out of glass. If the glass breaks, the broken glass may lead to
injury. Do not apply a strong shock to the panel, cut it with sharp metal, or damage it in any
similar manner.
■Cautions Concerning the Input and Output Connectors
To avoid damaging the instrument, only apply signals to the input connectors that conform to
the specifications in this instruction manual. Do not short or apply external voltage to the output
connectors. Doing so could damage the instrument.
■If You Will Not Use the Instrument for an Extended Period of Time
If you will not use the instrument for an extended period of time, remove the power plug from
the outlet.
■Cautions Concerning the Ethernet Port
When you are connecting the instrument to the communication provider's equipment, connect
to the Ethernet port through a hub that is authorized for use in the country that you are using
the instrument in.

IV
GENERAL SAFETY SUMMARY
■Calibration and Repair
This instrument has been carefully examined at the factory to ensure that its performance is in
accordance with the standards. However, because of factors such as parts wearing out over time,
the performance of the instrument may degrade. To ensure stable performance, we recommend
that you have the instrument calibrated regularly.Also, if the instrument malfunctions, repairs are
necessary. For repairs and calibration, contact your local LEADER agent.
■Routine Maintenance
When you clean the instrument, remove the power plug from the outlet.
Do not use thinner or benzene when you clean the instrument's case, panels, or knobs. Doing so
could lead to paint chipping and the corrosion of plastic components. To clean the case, panels,
and knobs, use a soft cloth with mild detergent, and wipe gently. While cleaning, make sure that
foreign materials, such as water and detergent, do not enter the product. If liquid or a metal object
enters into the instrument, fire or electric shock may result.
■About the European WEEE Directive
This instrument and its accessories are subject to the European WEEE Directive.
Follow the applicable regulations of your country or region when discarding this instrument or its
accessories. Follow the EU Battery Directive when discarding the batteries that you removed from
this instrument.
(WEEE stands for Waste Electrical and Electronic Equipment.)
Follow the warnings and precautions that have been listed in this section to use the instrument
correctly and safely. Precautions are also contained in various other sections of this instruction manual.
To use the instrument correctly, be sure to follow those precautions as well.
If you have any questions or comments about this instruction manual, please contact your local
LEADER agent.

1. INTRODUCTION
1
1. INTRODUCTION
Thank you for purchasing this LEADER instrument. To use this instrument safely, read this
instruction manual thoroughly, and make sure that you know how to use the instrument properly.
If some point about the operation of this instrument is still unclear after you have read this
instruction manual, refer to the contact information on the back cover of the manual to contact
LEADER, or contact your local LEADER agent.
After you have finished reading this manual, keep it in a convenient place so that you can refer
to it when necessary.
1.1 Scope of Warranty
This LEADER instrument has been manufactured under the strictest quality control
guidelines. LEADER shall not be obligated to furnish the following free services during the
warranty period.
1. Repair of malfunction or damages resulting from fire, natural calamity, or improper
voltage applied by the user.
2. Repair of a product that has been improperly repaired, adjusted, or modified by personnel
other than a factory-trained LEADER representative.
3. Repair of malfunctions or damages resulting from improper use.
4. Repair of malfunctions caused by devices other than this instrument.
5. Repair of malfunctions or damages without the presentation of a proof of purchase or
receipt bill for the instrument.
1.2 Trademark Acknowledgments
The company and product names in this document are trademarks or registered trademarks
of their respective holders.

1. INTRODUCTION
2
1.3 Operating Precautions
1.3.1 Power Supply Voltage
Confirm the voltage of the power source before you connect the power cord to it.
The power requirements of this product are indicated on the rear panel. Only use a power
source that supplies a voltage within the operating voltage range and has a frequency of
50/60 Hz.
1.3.2 Maximum Allowable Input Voltage
The maximum signal voltage that can be applied to the input connectors is indicated below.
Do not apply excessive voltage to the connectors. Doing so may damage the device or lead
to injury.
Table 1-1 Maximum allowable input voltage
Input Connector Maximum Allowable Input Voltage
CHANNEL 1 and 2 (PRIMARY, BACKUP) ±5V
CHANNEL 3 to 10 (PRIMARY, BACKUP) ±1.5V
CHANNEL 11 (PRIMARY, BACKUP) 0V/+5V (TTL)
LTC (PRIMARY, BACKUP) 4Vp-p
1.3.3 Mechanical Shock
This instrument contains sensitive components, so it may be damaged if it is dropped or
otherwise exposed to a strong shock.
1.3.4 Electrostatic Damage
Electronic components can be damaged by static discharge. Static electricity can build up
in the core wire of a coaxial cable. Before connecting a coaxial cable to an I/O connector of
the instrument, short the core wire of the cable with the external conductor.
1.3.5 Warming Up
To ensure more accurate measurements, turn ON the instrument approximately 30 minutes
before you intend to use it to allow its internal temperature to stabilize.

2. SPECIFICATIONS
3
2. SPECIFICATIONS
2.1 General
The LT 4448 is a changeover unit that automatically switches the signal from the primary
signal to the backup signal when problems are detected in the primary signal. Two systems of
input signals (primary and backup) are connected to the LT 4448, and the LT 4448 detects
errors in the amplitude of the primary input signal.
A single LT4448 has 11 BNC channels and 3 LTC channels. These channels can receive SDI,
NTSC/PAL black burst, HD tri-level sync,AES/EBU digital audio, word-clock signals, and LTC
signals. SDI signals are switched with relays; all other signals can be switched with electronic
switches. The power supplies are redundant. Alarms are generated when errors occur.
The LT 4448 is used in combination with the LT 4610 (SYNC GENERATOR) or the LT 4600A
(MULTIFORMAT VIDEO GENERATOR) at close distance.
2.2 Features
● I/O Connectors
A single LT4448 is equipped with 11 sets of BNC I/O connectors and 3 sets of LTC I/O
connectors.
A single set consists of a primary input connector, a backup input connector, and an output
connector.
● Input Switching
Relays are used to switch between the primary signals and backup signals of channels 1
and 2.
High-speed electronic switches are used to switch between the primary signals and backup
signals of channels 3 to 11 and LTC.
● Selecting the Input Signal
On channels 1 and 2, you can select SDI signals (3G, HD, SD), NTSC/PAL black burst
signals, or HD tri-level sync signals.
On channels 3 to 8, you can select NTSC/PAL black burst signals or HD tri-level sync
signals.
Channels 9 and 10 are exclusively for AES/EBU digital audio signals.
Channel 11 is exclusively for word-clock signals. It receives TTL signals.
LTC channels are dedicated to LTC signals. They are 2 Vp-p differential inputs.
● LTC Channels
LTC channels provide three systems of two inputs (primary and backup) and three systems
of one output.
It can also connect to an LT 4610 (SYNC GENERATOR) with a dedicated cable (sold
separately).

2. SPECIFICATIONS
4
● Fault Detection
When an input signal level error is detected, the LT 4448 lights the panel fault LED as well
as the panel LED that indicates the channel that is causing the problem. This feature allows
quick investigation of the problem.
Channels 3 to 11 are equipped with high-speed fault detection circuits. These enable the LT
4448 to switch to a backup signal with barely any disturbances shown on the screen when
problems such as interruptions occur in the primary signal.
● Alarm Detection
If an error is detected at an output connector of channels 3 to 11, or power supply, a panel
LED indicating where the error occurred lights to alert the user.
● Power Supply Start Time
A delay for starting the fault detection at power up can be set to none or approximately 1, 2,
or 4 minutes depending on the rise time of the system signal source that the LT 4446/4447
is connected to.
● SNMP Ready
Error monitoring over an Ethernet network is possible. Traps are issued for error detection,
panel control, and remote control. In addition, DIP switch settings (except for the user-
defined fault detection level) can be changed or read as status information.
IP address configuration software is included. (Compatible with Windows 7 32 bit and 64
bit, Windows 8, and Windows 10)
● WEB Browser
The LT 4448 can be controlled with a Web browser.
● Combining with an LT 4610 or LT 4600A
The depth of the LT 4448 is the same as that of the LT 4610 (SYNC GENERATOR) or LT
4600A(MULTIFORMAT VIDEO GENERATOR). This makes it easy to wire and operate the
devices when you combine them.
● Redundant Power Supply
Redundant power supply provides extra reliability. Alarms are generated when errors occur.

2. SPECIFICATIONS
5
2.3 Specifications
2.3.1 Compliant Standards
SDI Signal
3G-SDI SMPTE ST 372, SMPTE ST 424,
SMPTE ST 425
HD-SDI (including HD dual link) SMPTE ST 274, SMPTE ST 292,
SMPTE ST 296
SD-SDI SMPTE ST 125, SMPTE ST 259
Sync Signal
NTSC Black Burst Signal SMPTE ST 170, SMPTE ST 318,
SMPTE RP 154
PAL Black Burst Signal ITU-R BT.1700, EBU N14
HD Tri-Level Sync Signal SMPTE ST 274, SMPTE ST 296
AES/EBU Digital Audio Signal AES3, SMPTE ST 276
LTC Signal SMPTE 12M-1
2.3.2 I/O Connectors
Primary Input Connectors
Ch1 to 10 10 input connectors (75 Ω BNC connectors)
Ch11 1 input connector (TTL, 75 Ω BNC connector)
Backup Input Connectors
Ch1 to 10 10 input connectors (75 Ω BNC connectors)
Ch11 1 input connector (TTL, 75 Ω BNC connector)
Output Connectors
Ch1 to 10 10 output connectors (75 Ω BNC connectors)
Ch11 1 output connector (+5 V CMOS, 75 Ω BNC
connector)
LTC Connectors
Connector 25-pin D-sub (input and output shared)
Number of Inputs 3 systems each 2 inputs (PRIMARY, BACKUP)
Number of Outputs 3 systems 1 output (OUTPUT)

2. SPECIFICATIONS
6
2.3.3 I/O Characteristics
Ch1 and 2 (typical)
Return Loss 30 dB (0 to 10 MHz)
15 dB (10 MHz to 1.5 GHz)
10 dB (1.5 to 3 GHz)
Insertion Loss 0.2 dB (0 to 10 MHz)
0.5 dB (10 to 500 MHz)
2.0 dB (1.5 to 3 GHz)
Crosstalk -60 dB (0 to 10 MHz)
-48 dB (10 MHz to 1.5 GHz)
-40 dB (1.5 to 3 GHz)
Impedance External termination
Maximum Input Voltage ±5V
Ch3 to 10
Return Loss 30 dB (0 to 10 MHz, internally terminated)
Insertion Loss 0.3 dB (0 to 10 MHz)
Crosstalk -55 dB (0 to 10 MHz)
-45 dB (10 to 30 MHz)
Input Impedance 75Ω
Output Impedance 75Ω
Maximum Input Voltage ±1.5V
Ch11
Input Impedance Approx. 4 kΩ
Output Impedance Approx. 60 Ω
Maximum Input Voltage 0V/+5V (TTL)
LTC
Input Impedance 10 kΩ balanced
Input Signal Level 0.5 to 4Vp-p
Output Impedance 600 Ω balanced
Output Signal Level 2Vp-p±10%
Number of input channels LTC1, LTC2, LTC3 (3 channel inputs)
Number of output channels LTC1, LTC2, LTC3 (3 channel outputs)
GPI (LTC connector shared)
LT 4610 alarm outputs
Number of Inputs PRIMARY, BACKUP, 1 each
Number of Outputs PRIMARY, BACKUP, 1 each
Output method Through
Output Signal Level 5V CMOS

2. SPECIFICATIONS
7
2.3.4 Input Signals
Setting Method Select the input signal type for each channel
with DIP switches or external control.
Ch1 and 2 NTSC black burst signal
PAL black burst signal
HD tri-level sync signal
SD-SDI signal (270 Mb/s)
HD-SDI signal (1.485 Gb/s)
3G-SDI signal (2.97 Gb/s)
Ch3 to 8 NTSC black burst signal
PAL black burst signal
HD tri-level sync signal
Ch9 and 10 AES/EBU Digital Audio Signal
Ch11 Word-clock Signal (TTL)
LTC LTC Signal
2.3.5 Signal Switching
Switching Method
Ch1 and 2 Relays
Ch3 to 11, LTC Electrical switches
Switch Time of the Relay (*1)
Ch1 and 2 2 ms or less
High-speed Switch Time
Ch3 to 11, LTC 100 ns or less
Switch Time due to Fault Detection
Ch1, 2 and LTC 70 ms or less
Ch3 to 8
High-Speed Detection 1.5 H or less
Low-Speed Detection 60 ms or less
Ch9 and 10
High-Speed Detection 6 us or less
Low-Speed Detection 60 ms or less
Ch11
High-Speed Detection 60 us or less
Low-Speed Detection 60 ms or less
*1 This is the time it takes for the signal to stabilize after the relay is switched.

2. SPECIFICATIONS
8
2.3.6 Fault Detection
Fault Indication Indicates with LEDs the problematic signal
system (PRIMARY or BACKUP) if a fault is
detected
Fault Channel Indication Indicates with LEDs the problematic channels
when a fault is detected
DC Offset ±30 mV (sync signal only)
High-Speed Detection Detects a fault when a signal drops out
Low-Speed Detection Detects a fault when a signal level falls below
the detection level
Detection Level 2 to 5 dB below the specified level
Detection Reference
Ch1 to 11 Select LOW, HIGH, or user-defined level with
DIP switches for each input signal type.
Low level (*1)
NTSC Black Burst Signal -180 to -227 mV (-286 mV)
PAL Black Burst Signal -190 to -238 mV (-300 mV)
HD Tri-Level Sync Signal 337 to 476 mV (600 mV)
SD-SDI signal (270 Mb/s) 450 to 635 mV (800 mV)
HD-SDI signal (1.485 Gb/s) 450 to 635 mV (800 mV)
3G-SDI signal (2.97 Gb/s) 450 to 635 mV (800 mV)
AES/EBU Digital Audio Signal 631 to 794 mV (1000 mV)
Word-clock signal 1515 to 1907 mV (2400 mV)
High level (*1)
NTSC Black Burst Signal -210 to -264 mV (-286 mV)
PAL Black Burst Signal -220 to -277 mV (-300 mV)
HD Tri-Level Sync Signal 379 to 535 mV (600 mV)
SD-SDI signal (270 Mb/s) 505 to 713 mV (800 mV)
HD-SDI signal (1.485 Gb/s) 505 to 713 mV (800 mV)
3G-SDI signal (2.97 Gb/s) 505 to 713 mV (800 mV)
AES/EBU Digital Audio Signal 734 to 924 mV (1000 mV)
Word-clock signal 1759 to 2215 mV (2400 mV)
User-defined level (*2)
Ch1 to 8 -100 to -700 mV(when a signal that is equivalent
to a horizontal sync signal is applied)
Ch9 and 10 100 to 1400 mV (p-p value of input signal)
Ch11 500 to 3000 mV (high level of input signal)
LTC Signal amplitude 300 mVp-p or less

2. SPECIFICATIONS
9
Time from When the LT 4448 Turns On to When Error Detection Starts (*3)
Approx. 10 s (no delay) / Approx. 1 min. (60 to
80 s) / Approx. 2 min. (120 to 140 s) / approx. 4
min. (240 to 320 s)
*1 Depending on the instrument that you are using, there will be deviations in the detection level within
the ranges shown.
The parenthetical values are levels during normal operation.
*2 Depending on the shape of the waveform, the detection level that you have set may not be reached.
*3 The recommended setting when the power is started simultaneously with the LT 4610 is about 2
minutes.
2.3.7 Alarm Detection
Alarm Indications Indicates with LEDs when errors are detected in
output signals (channels 3 to 11), or power
supply.
Detection Setting ON / OFF (*1)
*1 If set to OFF, the alarm detection is disabled only for the output connector.
2.3.8 Key Lock
Lock and Unlock Hold down the KEY LOCK key.
Auto Key Lock Automatically locks the keys after 60 seconds of
inactivity (no key operations)

2. SPECIFICATIONS
10
2.3.9 External Control Connectors
Remote Connector
Use Remote control
Input SYNC SOURCE,AUTO SWITCHING, RESET
Output SYNC SOURCE, FAULT
Connector 9-pin D-sub (female)
Locking Screws #4-40 inch screws
Ethernet Port
Use Remote control and error monitoring from an
external PC
Compliant Standards 10BASE-T/100BASE-TX auto switching
Protocol
SNMP (SNMPv2c) Remote monitoring, alarm occurrence
HTTP Control through a browser
Supported browsers FireFox (latest)
Google Chrome (latest)
Microsoft Edge (latest)
IE9 or later (IE9、IE10、IE11)
Connector RJ-45
SNMP Read Community (*1) LDRUser (factory default)
SNMP Write Community (*1) LDRAdm (factory default)
SNMP Trap Community (*1) LDRUser (factory default)
SNMP negotiation AUTO
*1 The SNMP Community name can be changed with the included software or the HTTP server
feature.
USB Port
Use IP address configuration
Compliant Standards USB 2.0
Connector Type B

2. SPECIFICATIONS
11
2.3.10 General Specifications
Environmental Conditions
Operating Temperature 0 to 40 °C
Operating Humidity Range 90 %RH or less (no condensation)
Optimal Temperature 5 to 35 °C
Optimal Humidity 85 %RH or less (no condensation)
Operating Environment Indoors
Elevation Up to 2,000 m
Overvoltage Category II
Pollution Degree 2
Power Requirements
Redundancy Supported
Voltage 90 to 250 VAC
Frequency 50/60 Hz
Power Consumption 40W max.
Dimensions 426 (W) × 44 (H) × 400 (D) mm (excluding
protrusions)
Weight 4.0 kg (excluding rack support)
Accessories Power cord .......................................................2
Rack supports...................................................2
Rack support mounting screws........................4
CD-ROM (software and instruction manual)....1
Sold Separately
LC 2183 LTC Connection Cables Conversion cables (1.5 m) for the 25-pin D-sub
LTC connector of the LT 4448, the two 15-pin D-
sub LTC connectors for PRIMARY and BACKUP
connected to the LT 4610, and the three XLR
connectors for LTC output

3. PANEL DESCRIPTION
12
3. PANEL DESCRIPTION
3.1 Front Panel
Figure 3-1 Front panel
Table 3-1 Front panel description
No. Name Description Reference
1 ALARM The LEDs light or blink when errors are detected in the power supply, or
the output signals of channels 3 to 11. 4.9.2
2 FAULT The LEDs light when faults are detected in the input signals. 4.9.1
3 SYNC SOURCE Displays the signal that is being transmitted through the output connector.
You can press the key to manually switch the signal that is being
transmitted. The setting is shared among channels 1 to 11 and LTC.
4.8.2
4 AUTO SWITCHING Selects whether the output signal will be switched automatically when a
fault is detected in the input signal The setting is shared among channels 1
to 11 and LTC. Select SWITCH FAULT to switch the output signal
automatically.
Select DISABLED to not switch the output signal automatically.
4.8.3
5 FAULT INDICATOR The LEDs blink when faults are detected in the input signals.
Press RESET to reset alarm indications and fault indications. 4.9.1
6 CONTROL When LOCAL is lit, the top-panel DIP switch settings are valid. When
REMOTE is lit, the settings from the SNMP or HTTP server feature are
valid. Press the key to switch between LOCAL and REMOTE.
4.8.4
7 KEY LOCK The LEDs indicate the key lock on/off state. You can press the key to turn
the key lock on and off. Key lock turns on automatically after 1 minute of
inactivity (no key operations).
4.8.4
8 USB USB port. Connect to a PC to assign an IP address to the LT 4448. 6.1

3. PANEL DESCRIPTION
13
3.2 Rear Panel
Figure 3-2 Rear panel
Table 3-2 Rear panel description
No. Name Description Reference
1 Serial label The serial number is printed on this label. -
2 ETHERNET Ethernet port. Supports SNMP, and HTTP. 6
3 PRIMARY Primary signal input connector 4.6
4 OUTPUT Transmits the signal that is received through PRIMARY or BACKUP 4.6
5 BACKUP Backup signal input connector 4.6
6 AC INPUT 1
AC INPUT 2 AC inlet. Apply the cord stopper after inserting the power cord. 4.2
7 REMOTE Remote control connector. You can use this connector to perform functions
such as configuring the LT 4448 and transmitting fault information. 5
8 LTC Time code I/O connector. 4.7
9 Code stopper Power cord stopper. 4.2
10 Ground terminal Connect to an external ground. -