Link Lynx L2174 User manual

Document: CL140072 L2174 Manual Issue 2.5
PRODUCT MANUAL
Lynx Receiver L2174, L2074, L2170

Document: CL140072 L2174 Manual Issue 2.5 Page 2 of 28
1CONTENTS
1Contents .................................................................................................. 2
2Products Covered ...................................................................................... 3
2.1 Manual Issue .................................................................................................................3
2.2 Firmware Version ...........................................................................................................3
2.3 Support.........................................................................................................................3
3Safety and Compliance............................................................................... 4
3.1 CE Declaration of Conformity ...........................................................................................5
4Introduction.............................................................................................. 6
4.1 L2174 Internal Architecture .............................................................................................6
5Specification ............................................................................................. 7
5.1 Demodulation ................................................................................................................7
5.2 Decoding.......................................................................................................................7
5.3 Inputs & Outputs............................................................................................................8
5.4 Physical ........................................................................................................................8
6Input / Output Connections......................................................................... 9
6.1 RF1-4 inputs (L2174, L2074) ...........................................................................................9
6.2 ASI IN ..........................................................................................................................9
6.3 Frame lock input (L2174, L2170).................................................................................... 10
6.4 Video Outputs (L2174, L2170) ....................................................................................... 10
6.5 ASI out ....................................................................................................................... 10
6.6 Ctrl/Data..................................................................................................................... 10
6.7 Audio 1 ....................................................................................................................... 11
6.8 Audio 2 ....................................................................................................................... 11
6.9 Camera Control/Alarm .................................................................................................. 12
6.10 Ethernet –Control........................................................................................................ 12
6.11 Ethernet –Video over IP ............................................................................................... 12
7Controls ..................................................................................................12
7.1 Selection keys.............................................................................................................. 12
7.2 Menu scroll keys .......................................................................................................... 13
7.3 Hot Keys ..................................................................................................................... 13
7.4 LEDs........................................................................................................................... 13
7.5 USB port ..................................................................................................................... 13
8Operator Menus........................................................................................13
9Main Display ............................................................................................16
9.1 Demodulator Menus (L2174, L2074) ............................................................................... 16
9.2 Decoder Menus (L2174, L2170) ..................................................................................... 17
9.3 Stream Management Menu ............................................................................................ 18
9.4 System Menu............................................................................................................... 19
9.5 Camera Control (L2174 only)......................................................................................... 20
9.6 Web Browser Operation ................................................................................................ 21
10 Receiver Set-up........................................................................................23
10.1 Self Test ..................................................................................................................... 23
10.2 Demodulation Options................................................................................................... 23
10.3 Down Converter Type ................................................................................................... 25
10.4 Decoder ...................................................................................................................... 26
10.5 Deinterleaving ............................................................................................................. 26
10.6 Video over IP ............................................................................................................... 27
10.7 Decryption................................................................................................................... 27
10.8 Independent and Customised Down Convertor operation................................................... 27
11 Licences and Upgrades ..............................................................................27
11.1 Licensing..................................................................................................................... 27
11.2 Firmware Upgrades ...................................................................................................... 28

Document: CL140072 L2174 Manual Issue 2.5 Page 3 of 28
2PRODUCTS COVERED
Part No.
Product Description
Details
L2174
Lynx Diversity Receiver
UHF input 70-860MHz
L2170
Lynx Decoder
ASI Input only
L2074
Lynx Diversity Demodulator
UHF input 70-860MHz
2.1 Manual Issue
Issue
Date
Comments
1
November 2010
First Issue
1.1
December 2010
Minor formatting change
1.2
December 2010
Updated for V0009 release
2.0
September 2011
Updated for V0014 release including L2170 & L2074
2.1
November 2011
Minor corrections
2.2
January 2012
IP sections added
2.3
May 2012
Decryption added
2.4
December 2012
Multibandwidth LMS-T added
2.5
April 2014
Data connector part number corrected
2.2 Firmware Version
This manual is based upon Firmware version V1024
Please see the website for details of latest firmware revision
2.3 Support
For more information, or for service / support please contact:
Worldwide –Advent (SATCOM) Link (Wireless Cameras)
[email protected] [phone]
Americas - Advent (SATCOM) Link (Wireless Cameras) MRC (Microwave)
[email protected] [phone] or 888 777 9221
Asia Pacific - Advent (SATCOM) Link (Wireless Cameras) MRC (Microwave)
[email protected]om [phone]

Document: CL140072 L2174 Manual Issue 2.5 Page 4 of 28
3SAFETY AND COMPLIANCE
Any mains power equipment must be earthed.
Connection and disconnection from the Mains supply is achieved through a detachable mains cord. This must
be of a suitable rating and cross-sectional area, and be approved to the relevant national standards. The cord or
its plug must be easily accessible to allow disconnection.
SERVICE PERSONNEL - CAUTION
DOUBLE POLE/NEUTRAL FUSING
Replacement fuses must be of identical ratings to the original parts fitted, i.e. T5A H250
Operate the equipment within environmental limits and ensure as much ventilation as possible (normally Temp
0°C - 50°C <99% humidity).
Only authorised personnel should open the product and any repair or warranty will be invalidated if the seals
are broken.
The equipment has been designed to be CE compliant and Technical files are available on request.

Document: CL140072 L2174 Manual Issue 2.5 Page 5 of 28
3.1 CE Declaration of Conformity
Declaration of Conformity
RADIO & TELECOMMUNICATIONS TERMINAL EQUIPMENT DIRECTIVE
1999/5/EC
Issue 1 Date 02 November 2010
Equipment Covered:
Lynx Receivers L2174, L2170 & L2074
This equipment complies with the essential requirements of the above directive, as applied by the
following harmonised standards:
ETSI EN 301 489-1 EMC standard for radio equipment and services;
Part 1: Common technical requirements
ETSI EN 301 489-28 EMC standard for radio equipment and services;
Part 2: Specific conditions for wireless digital video links
ETSI EN 302 064 Harmonised EN for Wireless Video Links (WVL) operating in the 1,3 GHz
to 50 GHz frequency band
EN60950 Safety of Information Technology equipment
Manufacturer/Agent
Vislink International Ltd.
Vislink House
Maylands Avenue
Hemel Hempstead
Herts
HP2 7DE
United Kingdom
Certified by
H. Sadheura
Vislink International Ltd.

Document: CL140072 L2174 Manual Issue 2.5 Page 6 of 28
4INTRODUCTION
The Lynx Receiver range are highly flexible, high performance products based on compact DVB-T and LMS-T
demodulators using VISLINK’s Maximum Ratio Combining diversity algorithm, and a combined HD/SD
decoder.
The ultra low delay MPEG2 SD/HD Decoder has been speed optimised to operate with the Link Research Ltd
family of MPEG2 Encoders, which utilise field encoding. This range of decoders will not support frame
decoding. A licensable upgrade will allow support for B-Frame or ‘Generic’ MPEG2 Decoding that will support
frame decoding, but at higher delay.
The Decoder can also be licensed to support H.264 decoding. This will be available in different levels from
Main Profile 4:2:0 8 bit, up to High Profile 4:2:2 10 bit.
The product range is based on three hardware variants: Demodulator-only (L2074), Decoder-only (L2170) and
Demodulator-Decoder (L2174). All other variants are licensable and therefore allow for field upgrades by
changing the license to enable extra features as required. Please contact VISLINK for details.
This document has been written primarily for the complete L2174 Receiver. Where there are major differences for the L2170 and
L2074 variants they will be indicated, however some minor differences may not always be documented.
4.1 L2174 Internal Architecture
The L2174 is based on 3 main hardware components: Demodulator card, Decoder board and Controller board.
The L2074 & L2170 products do not have the Decoder and Demodulator boards fitted (respectively). Please
note that upgrading one of these to a full L2174 requires the unit to be returned to VISLINK.
Inter-board connector
INTERCONNECT
Demod
FPGA
Decode
FPGA
Inter-board connector
CONTROLLER
Display
CPU
Eth 1
(ctrl)
USB
Eth 2
(VIP)
Kbd
Decode ctrl
tx/rx
PSU
Expansion
connector
L2174
conn
Video IP
CC/
Alm
Ctl/
Data
CC ctrl
ctrl
MPEG data out
CC return
Audio 1
Audio 2
A2
Individual leads
A1 (2xXLR)
A1 (2xXLR)
RF1 RF2 RF3 RF4 ASI
in
Phantom
Power
Tuner
Audio
decoder
(DSP)
SDI CV SDI CV
sync
Vid
1
Vid
2
F
lock
ASI
Tx
ASI
out
Tuner Tuner Tuner
Inter-board connector
Demod ctrl
tx/rx
Demod to decode ASI 1
18V
Demod to decode ASI 2
As shown in the block diagram above, the Demodulator board generates an ASI stream from the RF inputs
and/or the external ASI, then passes this to the Decoder board to generate the Video and Audio outputs. In
addition, the Decoder extracts embedded (or ’wayside’) RS232 data if it is present in the transmission, as well as
return data from a VISLINK Camera Control System. There are 2 ASI connections between the boards to
allow extra flexibility in how the unit is configured (see later).
Video-over-IP functionality is all performed in the Demodulator card in the L2174 and L2074; the external
Ethernet connection is routed to this card and any ASI routing is performed between the two boards as
required. The L2170 uses the Decoder card for IP functionality.

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5SPECIFICATION
5.1 Demodulation
Modes supported (some are dependent on licences):
DVB-T:
6/7/8MHz bandwidth
QPSK/16QAM/64QAM
FEC 1/2, 2/3, 3/4, 5/6, 7/8
Guard Interval 1/32, 1/16, 1/8, 1/4
LMS-T:
Single and Dual Pedestals of 3, 4, 5, 6, 7, 8, 10 & 12MHz bandwidths
QPSK/16QAM
FEC 2/3
Guard Interval 1/8, 1/16
General:
Receiver performance meets or exceeds ES 202 239 in DVB-T mode (typical sensitivity -93dBm
@DVB-T QPSK 1/2)
5.2 Decoding
Video Formats supported:
SD: 625i50; 525i59
HD: 720p50; 720p59; 720p60; 1080i50; 1080i59; 1080i60; 1080p23; 1080p24; 1080p25; 1080p29;
1080p30; 1080psf23; 1080psf24; 1080psf25; 1080psf29; 1080psf30
HD Horizontal Resolution support (1080 line): 1920, 1440*, 1280*, 960*
HD Horizontal Resolution support (720 line): 1280, 640*
SD Horizontal Resolution support (576/480 line): 720, 704*, 640*, 540*, 528*, 480*, 360*, 352*
* Not supported in Low Delay mode
(other resolutions will work but artefacts may be observed)
Chroma Format : 420 / 422
Bit Depth : 8bit (MPEG2); 8/9/10 bit (H.264)
Maximum Bit Rate : 80Mbit (MPEG2)
Audio Formats supported :
MPEG-1 Layer 1 20-bit 48kHz
MPEG-1 Layer 2 20-bit 48kHz
SMPTE 302M 20-bit 2 channel 48hHz 8ms frame

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5.3 Inputs & Outputs
Summary (details in section 6):
4 x UHF input 70MHz to 860MHz, combined using Maximal Ratio Combining (MRC). Not L2170.
1 x ASI input (complies with ISO/IEC 13818-2 –188byte mode)
1 x Frame lock input (Black/Burst or Trilevel). Not L2074
2 x Video outputs (CVBS/SD/HDSDI). Not L2074
1 x ASI output (complies with ISO/IEC 13818-2 –188byte mode). 2 outputs on L2074
2 Audio channel outputs (analogue or digital). Not active in L2074
Data channel output. Not active in L2074
Video over IP connection (Ethernet RJ45)
IP control connection (Ethernet RJ45)
L1255 Camera Control Transmitter connection. Not active in L2074
5.4 Physical
 CAUTION : the side ventilation grilles must be kept clear to allow adequate airflow.
Size
Height 44mm, Width 210mm, Depth 375mm - including rear panel connectors
Small form 1U, ½ width 19” rack mount
Weight
~1.2kg
Operating temperature range
Ambient 0ºC to +50ºC
Power
AC input option 90 VAC to 264 VAC 50Hz to 60Hz; max current 1A(rms)
DC input option 9 VDC to 36 VDC (-ve chassis earth); max current 10A
70Watts excluding the downconverters requirements.
90Watts max allowing for downconverters and cables.
( L2170 - 45W; L2074 - 30W, not including downconverters)

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6INPUT /OUTPUT CONNECTIONS
L2174
L2074
L2170
6.1 RF1-4 inputs (L2174, L2074)
75Ω BNC type chassis connector
(if only 2 inputs licensed, inputs 3 & 4 are non-operational)
Note:- When operating in Dual Pedestal LMS-T(D) RF 1 & 2 are used for connection to the two down
convertors. Demodulator settings for 1 & 2 should also be used to configure the appropriate RF inputs.
UHF input 70MHz to 860MHz.
Receiver performance meets or exceeds ES 202 239 in DVB-T mode (typical sensitivity -93dBm
@DVB-T QPSK 1/2)
Max input (damage level): 2W (CW)
For configuration please refer to 9.1 Demodulator Menu
Note:-
These inputs can have +20VDC output (set in Unit/LNB Power) to power the external down converter;
limited to 400mA per connector, short circuit protected.
In Triax mode, inputs 1 & 2 are used in Single mode; in Dual mode the second system is added to inputs 3 & 4.
6.2 ASI IN
75Ω BNC chassis mounted socket. Complies with ISO/IEC 13818-2 –188byte mode.
ASI input to the Decoder, Packet diversity block, ASI output connector, or Video-IP block.

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6.3 Frame lock input (L2174, L2170)
75Ω BNC chassis mounted socket
Can be used to lock decoder output for both SD & HD video.
SD Mode :- Composite Black and Burst input for timing reference.
HD Mode:- Supports HD tri-level sync reference input.
Delay increased by 0 –40ms.
For configuration please refer to 9.2.4.1
6.4 Video Outputs (L2174, L2170)
75Ω BNC chassis mounted socket.
Output #1 and #2. Two independent outputs for HD or SD output of SDI video; or when operating in SD
mode these outputs can be configured to provide analogue CVBS output.
CVBS: PAL/NTSC, 1Vp-p
SDI: ITU-R BT.656 / ANSI/ SMPTE 259M @ 270Mb/s.
HDSDI: SMPTE 292M @1.485Gbps
For configuration please see 9.2.2
For Video formats supported see section 5.
6.5 ASI out
75Ω BNC chassis mounted socket. Complies with ISO/IEC 13818-2 –188byte mode.
ASI output from the Demodulator, Diversity or ASI input for decoding by an external decoder or chaining to
another L2174.
On the L2074, there are 2 separate ASI outputs, which can be configured separately.
For configuration please see 9.3.1
6.6 Ctrl/Data
Chassis Socket Connector :- LEMO EEF0B306CLV
Mating Cable Plug :- LEMO FGF0B306CLAD52Z
The six pin connector provides the RS232 input/output of the User Data and also for serial Remote Control of
the transmitter unit by Troll Remote Site Controllers
LEMO Pin
Function
Pin 1
Tx Data (output)
Pin 2
Rx Data (input)
Pin 3
0v
Pin 4
Tx Control (output)
Pin 5
Rx Control (input)
Pin 6
0v

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6.7 Audio 1
Not active in L2074
Two 3way XLR Male Chassis mounted plugs
XLR Conn
Function - Analogue
Function –Digital
(A1R only)
Pin 1
Audio Gnd
Audio Gnd
Pin 2
Live
AES +
Pin 3
Return
AES -
These connectors are switched to provide either analogue or AES-EBU (digital) audio outputs. In Digital mode,
the Left channel is muted and the Right channel carries the digital data
For configuration see 9.2.3
Note:- Permanent damage can occur to the audio output amplifiers if a connection is made to an audio input
that has Phantom power applied.
Internal protection is provided on the audio outputs but damage may still occur and this will not be covered by
warranty.
Analogue Mode:
48kHz sampling
Clip level 18dB
THD < 0.1%
20Hz to 18kHz ±0.25dB
Crosstalk >60dB minimum
Signal to noise ratio >66dB RMS
Digital Mode:
AES3 (110 Ω)
2 channels to 3Mbps
6.8 Audio 2
Not active in L2074
Connector type LEMO EEG0B305CLV
Lemo Conn
Function - Analogue
Function –Digital
Pin 1
Left Line + (Line)
Pin 2
Left Line - (Return)
Pin 3
GND
GND
Pin 4
Right Line + (Line)
AES +
Pin 5
Right Line - (Return)
AES -
This connector is switched to provide either analogue or AES-EBU (digital) audio output. In Digital mode, the
Left channel is muted and the Right channel carries the digital data
For configuration see 9.2.3
Note:- Permanent damage can occur to the audio output amplifiers if a connection is made to an audio input
that has Phantom power applied.
Internal protection is provided on the audio outputs but damage may still occur and this will not be covered by
warranty.
Specification as Audio 1

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6.9 Camera Control/Alarm
Connector - LEMO 6pin socket EEF.0B.306.CLL
‘Lemo’ Type
Function
Pin 1
0v
Pin 2
CCU control Rx (input)
Pin 3
CCU control Tx (output)
Pin 4
Status output (open drain)
Pin 5
Reserved for future use
Pin 6
Camera Return Data Tx (output)
The serial data from the camera is returned via the L1500 transmitter as part of the MPEG transport stream in a
similar way as the RS232 ‘User data’ .It is then extracted from the transport stream by the decoder and passed
back to the L1255 Data transmitter via this Camera Control connector (‘Camera Return Data Tx’).
For configuration see 9.5. Camera Control is only supported in the L2174.
The Status output is an open-drain output that by default is pulled low when an alarm is detected. It is also
possible to drive it manually via the menus (see 9.4.3) or web page. Max Voltage 20V; Max Current 1A.
6.10 Ethernet –Control
Standard 10/100 Ethernet connection for control of the unit using Web Browser (HTTP) and Network
Management (SNMP).
A copy of the unit’s SNMP MIB (Management Information Base) can be downloaded from this port. Enter the
following URL into a web browser (assuming the IP address is the default value of 192.168.0.90):
http://192.168.0.90/common/L2174-MIB.txt . This should always be used as the reference for any SNMP
application, to ensure that the version relevant to the current code release is being used.
6.11 Ethernet –Video over IP
Standard 10/100/1000 Ethernet connection for streaming encapsulated Transport Streams into and out of the
unit. Only UDP encapsulation is supported. For more details see sections 9.3.3 & 10.6
NB This input is completely separate from the Control Ethernet connection and cannot be used for web or
SNMP control
7CONTROLS
7.1 Selection keys
The MENU key allows rapid entry to main operating menu screen.
Pressing while in main screen returns to top of previous menu tree accessed.
The ESCAPE key takes the user up a level when navigating around the menus. Additionally allows ‘escape’
from an entry operation without committing to the value being adjusted.

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7.2 Menu scroll keys
UP / DOWN, LEFT / RIGHT arrow keys select an option displayed in the window and navigate around the
menu tree.
The ENTER key initially selects an option or a choice of selection; by using the UP / DOWN, LEFT /
RIGHT arrow keys to change the parameter, pressing ENTER key commits the change. Pressing ESCAPE
will abort the change.
The upper line, in smaller font, of the LCD shows the parameters available by means of a ‘prompt’, access to
the next menu level, or a summary of the status of the menu option.
Some menus will display ‘MORE>’ at the bottom; selecting this will bring up another screen of parameters.
Pressing ESCAPE in this instance will take you back to the previous menu, not up a level.
7.3 Hot Keys
STATUS key –Pressing this key brings the user directly to the ALARMS menu screen. If there is more than
one active alarm (as indicated in the top right corner), pressing the Left and Right arrow keys will cycle through
them. On L2174 and L2074:
- Pressing it a second time will bring up a display showing the current receive signal strength on
each of the 4 RF channels.
- Pressing it a 3rd time will bring up a display showing the current MER (Modulation Error Ratio)
of each of the 4 RF channels (see example screen below)
- Subsequent presses cycle through the 3 screens above.
- To exit press ESCAPE or MENU
MODE key –Pressing this key toggles the front panel between control of the Local unit, or a Remote unit.
Initially the only remote device that can be controlled is the L1255 Camera Control transmitter.
7.4 LEDs
STATUS –This LED is Green for normal operation, and illuminates Amber or Red when an error has
occurred. It will be Red for unit-critical errors that require immediate attention (e.g. hardware fault), and Amber
for other errors (e.g. no RF lock). The type of error is listed under the ALARMS menu option.
POWER- Green LED when illuminated indicates power is applied to the unit.
LOCAL/REMOTE –These LEDs indicate whether the front panel is controlling the Local unit or a Remote
device, as set by the MODE key.
7.5 USB port
This allows a USB memory stick to be inserted for code updates. It cannot be used for remote control of the
unit.
8OPERATOR MENUS
The following diagrams show the menu structure in the unit (note that this is subject to change with software
upgrades). This section gives an overview of each function in the menus. Where a menu is different depending
on the variant, this is shown.
Some features of the L2174 are licensed options; therefore some options will not be selectable depending on the
status of the unit. Please contact Vislink giving details of the unit’s electronic serial number to confirm.

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AUDIO 2/3/4
AUDIO 2/3/4
Frequency
B/W Guard
FEC
Decoder Mode
MENU KEY
DECODER
OPTIONS DESCRAMBLING
Descrambling On/
Off
Descrambling
Type
RS232 DATA
Data On / Off
Baud Rate
PIDs
IDENTIFIERS
BISS Key
BISS E ID:
Parity
Audio A PID Audio B PID
PCR PID
Video PID
More>
Data PID
NTSC Ped/
PsF Mode
Video Loss
Pixel Offset
Default Std Frame Lock
VIDEO OUTPUT
Output 1
Output 2
AUDIO 1
Output
Mode
AUDIO 2/3/4
AUDIO OUTPUTSERVICES
Select
Number of
Services
Lock
More>
Bitrate
Sample Rate
Layer
Auto
DECODER
CONFIG
DECODER
STATUS KEY Any Alarms
RF Bars
MER Bars
More>
Video Format
Video Mode
Constellation
Audio A&B
Lock status
Default Service
Audio DIDs
DOWNCONVERTERS
Input 1
DEMODULATOR
continued
INPUT MODE
Input select
Input 1 Input 2 Input 3 Input 4
Frequency
Bandwidth
Guard Interval
Polarity
DEMODULATOR
SETUP
Demod Mode
Input 2 Input 3 Input 4
Downconv
Other LO (freq)
Power
Set All Inputs
Only if D/C = ‘Other’
Not if D/C = ‘None’
‘MODE’ KEY
CAMERA
CONTROL
Camera Type
Power
Frequency
Status
MORE>
Modem
Baudrate
Lock
Local Remote
Option
continued
Depends on SD/HD
mode
Triax
DEINTERLEAVER
Enable
FEC
Burst Length
Delay
Not L2170 Not L2074
L2174 only
Demod Mode
Overlay Type
Background
If
Overlay
ON
Overlay Colour
Group
As Audio 1
Audio C&D

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SERVICE
Support
HELP MISCELLANEOUS
Serial Numbers
CONTROL
INTERFACES
DIAGNOSTICS
SW Versions
SYSTEM
TIME
Time
Date
Format
Run Hours
ETHERNET PORT
IP Address
Network Mask
Lamp Test
Fault Test
LICENCES
continued
Gateway
DEMODULATOR DECODER
Pre BER Video Lock
PCR Lock
TS Lock
Frame Lock
MORE >
Chroma
GOP
TS Errors
Post BER
WEB IDENTIFIER
Web Text
PRESETS
Preset number
Recall
UNIT
Unit Temp
Demod Temp
Decoder Temp
SELF TEST
Name
SAVE TO
MEMORY
RECALL FROM
MEMORY
Preset number
Clear Name
Name
Save
DEFAULTS
Restore Defaults
MORE >
TPS Lock
FEC Lock
DCM Lock
SYSTEM
Camera Volts
BOARD IDS LICENCE ENTRY DEMODULATOR
FEATURES
Controller ID
Demod ID
Decoder ID
STATUS PIN
MODE
STATE
Line1 Line2
SUBMIT
DSP count
MAC
DECODER
FEATURES
STREAM
MANAGEMENT
ROUTING
DECODER
ASI Out
IP SETUP
IP Out
ASI to IP IP to ASI IP Ethernet setup
IP
MAC
Status
IP Lock
More>
Rx IP Port
Dest
Dest Port
Src Port
More>
Encap Type
TS per IP
DCON CURRENTS
L2174
ASI Out 1 ASI Out 2
L2074
DECODER
ASI Out
L2170
Not L2170 Not L2074 Not L2074
Not L2074 Not L2170
HW Versions
Not L2074 Not L2170
Not L2170 Not L2074
MORE >
Pic Height
Bit Depth
Pic Width
Stream Type
Only when in h264 or Generic MPEG2 mode
Save config to
USB
LCD Contrast
Reboot
Encap Type
TS per IP
Mask
Gway
Speed
IP Out
IP Out
DIVERSITY
ASI Input
Demod Input
IP Input
Delay

Document: CL140072 L2174 Manual Issue 2.5 Page 16 of 28
9MAIN DISPLAY
This displays, at a glance, the current frequency selection and modulation parameters. The top line also displays
the lock status of the individual RF and ASI inputs ( = locked ), and the video format detected by the
decoder. The bottom line displays the currently selected Decoder and Demodulator Modes.
RF Lock
Status 1-4
ASI Lock Decoded
Video Format
Decoder mode Demodulator mode
Pressing the MENU key will take the operator to the main setup menus; pressing MENU again at any point
returns to this display.
If any parameter has not yet been initialised (e.g. shortly after power-up), then it will display as dashes (“---“).
The L2074 Main display is identical, except the Video Format is not displayed.
The L2170 Main display shows the Service selection menu (see section 9.2.1), plus the ASI lock status and
Video Format.
9.1 Demodulator Menus (L2174, L2074)
9.1.1 Input Mode
Allows the operator to select the required Modulation scheme being used (DVB-T, LMS-T(S),
LMST(D)).
When the unit is first switched on, and when switching modulation modes, the unit performs a self
test routine on the RF front end. This causes a slight delay (15-30s) before the demodulator will lock.
For more details see section 10.2
Individual inputs can be turned on and off as required. Note that in Dual Pedestal LMS-T(D) mode,
only Inputs 1 & 2 are active.
The Receiver supports the Link Remote Triax System (L1273/4), which allows downconverters to be
sited remotely (up to 1km from the receiver). This can be set to Single or Dual mode; in Single mode,
2 downconverters are mounted remotely, and the triax system is connected to RF1 and RF2 on the
Receiver. The other 2 inputs can be connected directly to downconverters. In Dual mode, two triax
systems are connected, to RF 1/2 and RF3/4 respectively. This feature defaults to Off.
9.1.2 Demodulator Setup
Operator can configure Frequency, Bandwidth, Guard Interval and Polarity. Apart from Frequency, all
have ‘Auto’ modes, which allows the Demodulator to detect the correct configuration from the
received signal. Note that in LMST(D) mode, the bandwidth shown is the combined width of the 2
pedestals.
If a frequency is entered that is outside the range of the currently selected downconverter, then an
‘Invalid Frequency’ alarm will occur, and reception will not be possible,
9.1.3 Downconverters
For each RF input, select the downconverter type, and turn on power to the downconverter. All
current Vislink downconverters are listed, or the Local Oscillator (LO) frequency of any unlisted
downconverter may be entered by selecting OTHER. To enter the incoming UHF frequency directly,
select NONE. When NONE is selected, downconverter power is disabled.
Example Home screen
(when locked)

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To change all RF inputs to the same downconverter settings at the same time, SET ALL INPUTS
should be set to ON; to set them individually, turn this setting OFF.
Note that the Receiver frequency will not change according to the downconverter type, unlike
previous Link products. This greatly simplifies setting up the unit to work with multiple
downconverter types, and also when switching between downconverters that cover the required
frequency range.
9.1.4 Deinterleaving
The Lynx Receiver has a licensable deinterleaving option, to match the interleaving option in the
L1500 transmitter. This option adds an extra layer of error correction to the ASI data steam that allows
long breaks in RF reception to be corrected. In the transmitter, the user can select the amount of FEC
used and the duration of RF break that can be corrected. When Enabled, the Receiver automatically
detects these settings and adjusts the deinterleaving appropriately. The settings are displayed for
information but cannot be altered. Adding interleaving to an ASI stream reduces the ASI bit rate
available for video/audio etc. and adds a delay to the signal. The additional delay is shown in the
menu. For more details see section 10.5.
9.2 Decoder Menus (L2174, L2170)
9.2.1 Services
Number of Services: Displays the number of services in a particular incoming multiplex.
SERVICE: In Auto mode, displays the currently selected service. In Manual mode, allows the
decoded service to be selected as follows:
Press ENTER on this menu item followed by UP/ DOWN arrow keys; the
service “NAME” of each service available in the incoming multiplex will be
displayed on the line below. When the desired service is shown press ENTER.
This will then be decoded in to video / audio outputs provided the signal is of the
correct format (SD/HD), and is not scrambled or a valid descrambling key has
been entered.
Once selected, this service name will become the “preferred” (or Default) service,
such that on power / signal interruption this particular service will be the only one
that is decoded, on restoration of power / signal. If the preferred service name
appears in a particular multiplex, this is the one that will be decoded unless another
is chosen.
If the Default service name is not present then no service will be decoded. NB
This means that if the service name is altered in the encoder, then decoding will
stop.
If a service has not been given a name (some encoders default to this mode), then
the decoder will create a name of the format “Prog00001”, which will allow it to
be selected.
Auto: When ON will always select the first service in the multiplex. Once a service has
been selected in this way, it will remain selected even if other services are added to
the multiplex. Auto mode defaults to ON.
Default: Displays the current Default service name. It is only valid, and can only be edited,
when Auto Mode is Off.
9.2.2 Video Output
Output 1/2: Select the output mode of the two rear panel connectors. In HD mode this is fixed
to SDI; for SD it can be switched between SDI and CV (Composite Video).
In both modes a Status overlay can be added to the video output which gives an
at-a-glance update on the status of the link.
Overlay Type: This is only displayed if the overlay is turned on. There are 2 types, Basic and
Service. In Basic mode, the following information is displayed: Frequency, Guard
Interval, Mode, Constellation, FEC, Camera Volts (when used with a Link L1500
Wireless Camera Transmitter). In Service mode, just the selected service name and

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the Camera Volts are displayed. In both modes there is also a bar across the screen
that represents the MER from the best RF input.
Background: This is only displayed if the overlay is turned on. This allows the opacity of
background of the overlay to be varied from Off (transparent) to 100% (opaque).
Default Std: This selects the format of the output video when no video is present on power-on.
If video lock is subsequently achieved and then lost, the format of the locked
video is used.
NTSC Ped: Selects whether Pedestal is inserted on the NTSC output (SD only).
PsF Mode: Tells the decoder whether to interpret the incoming video as segmented frame or
interlaced video (HD only).
9.2.3 Audio Output
Audio A/B: Selects the output format on the rear panel: Analogue or AES digital (output on
Right channel only). Also displays status information from the decoded audio.
9.2.4 Decoder Config
9.2.4.1 Decoder Options
Video Mode: Select between the available Decoding modes
Video Loss: Select behaviour on loss of video –display blue screen or freeze display
Frame Lock: Select between SD Black&Burst and HD tri-level sync (HD mode only) on the rear
panel input, or disable this function.
Pixel Offset: If Frame Lock enabled, enter the offset required in pixels.
9.2.4.2 Descrambling
Select Descrambling mode (if licensed) and enter key(s)
9.2.4.3 RS232 Data
Enable extraction of embedded data from the MPEG stream. Displays the detected baud rate and
parity. Displays dashes if no data detected.
9.2.4.4 Identifiers
Audio DIDs: Selects into which SDI Group the two Audio channels will be embedded.
PIDs: The PIDs detected in the currently selected service are displayed.
9.3 Stream Management Menu
These menus control aspects of the transport stream handling in the unit not directly related to the
Demodulator or Decoder, including Video over IP.
9.3.1 Routing
Select the source of the Transport Stream used for each output. Depending on model and options
these can be Demodulator, Diversity, ASI or IP. Note that IP In cannot be used as a source for IP
Out. IP Out is the only output that can be turned Off.
9.3.2 Diversity
If the Packet Diversity licence is enabled, then this selects which of the 3 inputs are used for the
Diversity function. At present only the ASI and Demodulator inputs can be used, so no settings can be
changed. In future the IP input will also be selectable.
9.3.3 IP Setup
For more information on Video over IP setup see section 10.6
9.3.3.1 ASI to IP
Dest: Enter the IP address of the destination device.
Dest Port: Enter the UDP port to be used on the destination device.

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Src Port: Enter the UDP port on this device to send the stream from.
Pixel Offset: If Frame Lock enabled, enter the offset required in pixels.
Encap Type: Currently only UDP is supported.
TS per IP: Enter the number of ASI packets to be encapsulated in each IP packet.
9.3.3.2 IP to ASI
Rx IP port: Enter the UDP port on this device to be used to receive the stream.
Encap Type: Currently only UDP is supported.
TS per IP: Displays the number of ASI packets encapsulated in each IP packet (read only).
9.3.3.3 IP Ethernet Setup
IP: Enter the IP address on this device to be used to receive the stream.
Mask: Enter the Subnet Mask to be used for IP in and out
Gway: Enter the default Gateway (router) IP address.
Status: Displays status of the Ethernet link used for IP video
Speed: Displays link speed of the Ethernet link used for IP video
IP Lock: Shows whether the IP in block is receiving a valid transport stream
MAC: Ethernet MAC address of the IP video port.
9.4 System Menu
9.4.1 Presets
Up to 16 preset configurations can be saved in the unit.
Save To Memory: Specify the number of the preset to be saved. It is possible to enter a name
for the preset if desired. Change SAVE to YES and press ENTER to save
the preset.
Recall From Memory: Specify the number of the preset to recall; if a name has been assigned this
will be displayed. Change RECALL to YES and press ENTER to load the
preset.
Defaults: To restore the unit to factory defaults, change RESTORE DEFAULTS to
YES and press ENTER.
NB. Performing a Restore Defaults will clear all stored Presets
9.4.2 Diagnostics
Detailed information on the performance of the unit can be displayed by function:
Demodulator: pre- & post-Viterbi errors; TPS & FEC Lock, Downconverter currents & SELF
TEST results.
Decoder: Video Lock, TS lock, Frame Lock, Chroma & GOP formats. In h.264 and Generic
MPEG2 modes, also displays picture format information
Unit: Temperatures
System: Camera volts (when used with a Link L1500 wireless camera transmitter)
9.4.3 Control Interfaces
Configure external control interfaces:
Web Identifier: Set a text string to be displayed on the unit’s web page. This helps to identify which
unit is being controlled when working with multiple units.
Ethernet port: Set the IP parameters for the Ethernet control port. NB This is not related to the
Video IP port (see section 9.3.3

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Status pin: The Status pin in the CC/ALM connector (see section 6.9) is an open-drain output
that connects to Ground when active. By default this is when an Alarm occurs; it is possible to select
whether it is active high or low. It can also be driven manually using this menu, however.
9.4.4 Service
9.4.4.1 HELP
These menus display information useful when contacting Vislink Service, in particular the versions
of the various modules in the unit. There is also an option to dump the unit’s current configuration
to a USB memory stick. This file (configuration.txt) can be emailed to customer support in order to
assist with any problems.
9.4.4.2 Licenses
Enter licence codes and display which features are licensed in the unit. See section 11.1 for more
details
9.4.4.3 Time
Set unit Time and Date, and display the accumulated run-time of the unit in hours.
9.4.4.4 Miscellaneous
Test the front panel LEDs, adjust the contrast of the display, and initiate a unit Restart.
9.5 Camera Control (L2174 only)
This menu allows the operator to remotely control an L1255 Data Transmitter, if one is connected to the rear
panel CC/ALM connector. It is accessed by pressing the MODE key to change the unit to REMOTE mode. If
an L1255 data transmitter is connected then the Camera Control option will be available.
Camera Type: Select the camera type to be used, from:
Philips, Sony, Ikegami, Sony CamC, Generic, Panasonic, Sony DXC, Thomson, Hitachi
(This list correct at time of writing, but is subject to change –contact Vislink Support for the
latest list of supported cameras).
Power: Set UHF transmit power (0.1W to 2.0W)
Frequency: Set UHF transmit frequency 410-490MHz. Dependent on the version of L1255 connected.
Status: Confirms communication status of L1255 CCU unit and, in the case of the L1255-4149,
shows the firmware version.
Modem Internal: Uses internal modem and local RF power output
External: Disables local RF output and allows CC serial data to be transmitted down RS485
path to remotely situated L1255 Modem unit
Baudrate: Indicator of input baud rate. If set to 115200, it means that there is no return data being sent
back from the camera. When correctly working should display 9600 or 38400
Lock Indicates the receiver is locked to a remote WCT.
CCU Options Setting the left-most character to ‘1’ enables the status LED on the L1255 front panel to
indicate data transmission. Setting the left-most character to ‘2’ enables the LED to indicate
the presence of return data from the camera.