NDL SERIES II
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MiMOMax Linking Products
General
The MiMOMax Network Digital Link (NDL) is a software flexible, ultra low latency, digital radio
link designed for mission critical data linking and back-haul applications.
The NDL product family utilises licensed narrow band radio channels and MiMO technologies
in 2x2 and 2x4 configurations to provide industry leading spectral efficiencies of up to 12.8
bits/Hz/s or greater, enabling raw data rates of up to 320kb/s including link overhead.
Utilising licensed spectrum ensures that the link operates in an interference free environment
and is capable under the right conditions of providing a reliable low-error data transport
service (<1×10
For data linking applications the NDL will provide a number of industry standard data
interfaces at link end points.
NDL
The MiMOMax NDL is designed to provide high reliability, fixed linking solutions to a number
of mission critical industries. A primary target application is linking together conventional and
trunked, digital and analogue radio sites.
A MiMO antenna (or antennas) provides both vertically and horizontally polarized signals at
each end of the link, to produce a high performance, pattern diverse MiMO link of over 30km
with near-line-of-sight capability, and non-line-of-sight over shorter distances. The addition of
a second optional MiMO antenna and receiver operating in a 2x4 configuration can provide
further spatial diversity and link robustness.
A number of interfaces are available to support multichannel, conventional, analogue,
Simulcast, MPT, P25 or TETRA digital networks, in trunked and simulcast configurations. A
separate high quality site interface card with up to 6 x 32k ADPCM audio channels plus a 9k6
RS232 signalling channel, supports analogue networks.
With these applications in mind, the NDL is designed to have ultra low latency and low jitter
whilst fitting in the usual channel allocations allocated to fixed radio links. Multiple links can
be cascaded to cope with difficult terrains or very long paths.
-7
bit error rate).
1
Network Digital Link (NDL)
1 PRELIMINARY PRODUCT
FEATURES
1.1.1 Spectral Efficiency
The NDL utilises 2x2/2x4 MiMO
QPSK/16/64/256QAM technologies, to
achieve industry-leading spectral
efficiency of 80/160/240/320 kb/s raw data
rate in a 25kHz channel (40/80/120/160
kb/s in a 12.5kHz channel).
1.1.2 Built-in Multiplexer
The NDL has a built-in data multiplexer, supporting a mix of traffic from serial or Ethernet
interfaces depending on interface option chosen. An external multiplexer (Rack Mount)
supports additional interfaces.
1.1.3 Built-in Duplexer
For full duplex multi-antenna operation whilst maintaining a small overall size, the NDL has
built-in antenna micro duplexers. External antenna duplexer options are available if required.
1.1.4 Form Factor & Installation
The NDL is pole, wall or rack mountable (forced-air cooling when rack mounted). Occupying
2U in a standard 19in rack, it can be installed by installers with normal industry competency.
Both the Wall and Pole Mount options include a sun shade.
1.1.5 Configuration, Monitoring & Alarms
The NDL offers a comprehensive configuration and monitoring package which enables both
local and optional remote configuration and monitoring of the system. The configuration tool
can be accessed locally, or optionally over the air or remotely via an internet connection.
SNMP is also optionally available. The alarms can be configured in a number of ways
depending on application.
1.1.6 M-CAM – MiMOMax Cognizant Adaptive Modulation
M-CAM is MiMOMax’s proprietary smart adaptive modulation scheme, designed to optimise
the data throughput while simultaneously maintaining the radio link in adverse conditions. It
achieves this by adapting the RF modulation scheme depending on the measured “quality” of
the received signal. It traverses from QPSK through to the maximum modulation scheme
available and vice versa, depending on the RF channel conditions.
This feature can be disabled if required, and the modulation fixed in a specified state
independent of signal quality. M-CAM typically allows for better utilisation of the channel as
the modulation order is adapted as channel conditions change. In some circumstances this
may not be desirable (e.g. synchronous data, where fixed latency is required).
1.1.7 M-DAP- MiMOMax Data Acceleration Protocols
MiMOMax Wireless Ltd has released an optional suite of Data Acceleration Protocols (MDAP). M-DAP is a suite of up to four individual protocols which accelerate the transfer of data
across all MiMOMax linking products. In additional to accelerated data transfer, M-DAP also
offers a QoS solution that fragments low priory data traffic to enable low jitter and ultra low
latency for high priority traffic (for example VoIP). It compresses Ethernet, IP, UDP and RTP
headers to allow additional bytes for the voice payload. This is particularly useful when
protocol headers of VoIP streams occupy more bytes than the voice payload. For example,
the headers on a VoIP packet might ordinarily occupy up to 60 bytes, but, M-DAP can
compress this down to an ultra efficient 3 bytes.
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MiMO
Multi Port
Nib
1.1.7 M-RAP – Routing Adaptation Protocols
M-RAP is a suite of protocols that provide dynamic re-routing in the event of a path failure,
where multiple paths are available. M-RAP is able to learn the topology of the network and
therefore reroute paths as the topology changes (links lost or added). The OSPF (Open
Shortest Path First) routing protocol is used to determine which path to take to achieve this
re-routing functionality in a MiMOMax system. Where networking equipment is set to use a
radio as the “default gateway”, there is a risk that the entire subnet could become
unreachable in the event of the gateway going offline. MiMOMax uses VRRP (Virtual Router
Redundancy Protocol) to dynamically assign a virtual IP address, so that any MiMOMax radio
in the subnet can perform the role of default gateway. OSPF routers only communicate their
state with the other routers in that “area”. GRE (Generic Routing Encapsulation) protocol may
be used to pipe this monitoring information from the “areas” to a monitoring system in the core
of the customer’s network.
1.2 E
NVIRONMENTAL SPECIFICATIONS
1.2.2 Operating Temperature Range
Maximum ambient temperature range -25°C to +60°C
(Where the radio unit is exposed to direct sunlight a suitable solar shield is required to prevent solar temperature
gain)
1.2.3 Humidity
4% to 100% (per EN 300 019 sec. 3.3 & 4.2H)
1.2.4 Environmental Protection
IP67 for outdoor wall or pole mount. IP20 for indoor rack-mount unit
1.2.5 Operating Altitude
Up to 3000m
1.3 E
XTERNAL COMPLIANCES
The product is designed to comply with the following standards:
Radio Performance:
• AS/NZS 4768
• EN 302 217
• FCC 47CFR part 90
• RSS-Gen, RSS-119
EMC:
• AS/NZS/CISPR22
• EN 301 489
• FCC 47CFR part 15
• ICES-003
Environmental:
• EN 300 019 sections 3.3 and 4.2H
Safety:
• EN 60950
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Multiple MiMO Multi Port Nib
1.4 I
1.4.1 Ethernet Interface
For linking digital networks, Ethernet connectivity is presented via an RJ45 socket and is
configurable to provide connectivity to other IP enabled networked devices. The network
connectivity provided by the NDL is at layer 2 (IP). Layer 3 is also optionally available.
Bandwidth not used by this connection is available for other optional interfaces. User data
rates of up to 256kbps can be supported in the appropriate configuration.
1.4.2 Analogue and Serial Interface and Connection
An optional external audio interface card provides up to 6 high quality 32k ADPCM audio
channels plus an asynchronous 9600bd RS232 serial data interface. This enables the direct
support of up to 6 analogue VF channels with site signalling over one MiMOMax NDL link, for
example supporting a 6 channel MPT site over one NDL 25 kHz link. Other codecs may be
supported on request.
1.4.3 Power Interface
The NDL operates on an external DC supply over a range of 10.5V to 32V. Optional external
AC or DC power supplies (230/110V AC or 48V DC) are available for mains or higher voltage
operation.
1.5 P
1.5.1 Raw Link Data Rate
MiMO NDL operates with QPSK or 16/64/256QAM at a symbol rate of 20(10)
kilosymbols/second, resulting in raw data rates of 80/160/240/320 kb/s in a 25 kHz channel
(40/80/120/160 kb/s in a 12.5 kHz channel). MiMOMax Cognizant Adaptive Modulation (MCAM) is available as an option to enhance link reliability and throughput.
NTERFACES
ERFORMANCE
1.5.2 Transmission Frequency Band & Bandwidth
The NDL operates on 12.5 kHz or 25 kHz PMR paired channels within the 420-470MHz band.
1.5.3 Transmission Power
The NDL transmits a maximum power of 1W average per transmitter (total 2W average for
2x2 and 2x4 MIMO).
1.5.4 Ethernet Interface Performance
1.5.4.1 Ethernet Physical Layer
The physical layer of the Ethernet interface is 10BaseT.
1.5.4.2 Bit Error Rate
The bit error rate provided by the IP transport (via Ethernet) service under appropriate
link conditions is typically less than 1×10
-7
.
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NDL SPECIFICATIONS (PRELIMINARY)
1.6 G
Configuration 2 x 2 MIMO 2 x 4 MIMO
Supply Voltage 10.5V DC to 32V DC
Maximum Power
Consumption
Ambient Temperature Range -25ºC to +60ºC
Mounting 2U high rack mount
Dimensions (W x H x D),
Rack mount option
Dimensions (W x H x D),
Wall/pole mount option
Weight 6.8kg (radio unit only, excluding mounting)
Rate
ENERAL
92W at 13.8V
Also available as pole/wall mount unit
440 x 84.5 x 382 mm (box size)
481 x 86 x 392 mm (including protrusions)
262 x 393 x 86.5 mm
(radio unit only, excluding mounting)
25 kHz 80/160/240/320kb/s 320 kb/s Gross Data
12.5 kHz 40/80/120/160kb/s 160kb/s
1.7 T
Number of MIMO transmitters 2
Modulation QPSK, 16/64/256QAM
RF Power Output 2 x +30dBm (1 Watt) average
RF Power Control Range 10dB
RF Power Tolerance +/- 1dB
Frequency Range 420 to 470 MHz
Frequency Step Size 6.25 kHz
Frequency Accuracy and Stability ≤2ppm
RANSMITTER
Nominal Channel Bandwidth 12.5 kHz or 25 kHz
RF & EMC Standards Compliance See section 1.3
1.8 R
Number of MIMO receivers 2 4
Modulation QPSK, 16/64/256QAM 256QAM
Sensitivity
for 10
Sensitivity
for 10
Frequency Step Size 6.25 kHz
Frequency Accuracy and
Stability
Nominal Channel Bandwidth 12.5 kHz or 25 kHz
RF & EMC Standards
Compliance
ECEIVER / DIVERSITY RECEIVER
25 kHz
-4
BER
-7
BER
12.5 kHz <-106/-102/-97/-90dBm <-90dBm
25 kHz <-101/-98/-92/-85dBm <-85dBm Typical RF
12.5 kHz <-105/-101/-95/-88dBm <-88dBm
<-102/-99/-94/-87dBm <-87dBm Typical RF
≤2ppm
See section 1.3
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1.9 D
Frequency 420 to 470 MHz (In three frequency splits)
Tx / Rx split 5 MHz minimum
Stop Band Attenuation >70dB
Stop Band Bandwidth >500kHz
Insertion Loss <2dB
UPLEXER (INTERNAL
)
1.10 A
Ethernet
Format 10BaseT
Connector RJ45
Supported Bit Rates Up to 280 kb/s *
Serial (optional)
Format RS232
Connector DB9 female
Rate 9600 baud
Audio (optional)
Format 6 x 4 wire 600Ω ports
Coding 32kbps ADPCM **
Connector 6 x RJ45
Signalling Via RS232 serial port
* The total aggregate data rate is 70, 140, 210 or 280 kbps dependent on configuration
and signal path. Use of M-DAP further improves throughput.
** Other CODECS also available on request
NALOGUE AND DATA INTERFACE
2 ANTENNAS
2.1
DUAL-POLARISED COMPACT YAGI
Polarisation Horizontal and vertical with separate feeds
Antenna Gain >10dBi across the band
Beam width -3dB (parallel to
polarisation plane)
(perpendicular to polarisation
plane)
Front-to-back ratio >15dB
Frequency bandwidth (15dB
return loss)
Connector arrangement 2 x male Type N connectors on 1.5m tails of RG214
Mounting Twin vertically spaced clamps for attachment to 25 - 55
Number required per link end 1 for 2 receiver MIMO, 2 for 4 receiver MIMO
Dimensions W x H x L
(direction of propagation)
Weight 2.5 kg including coax tails and mounting brackets
48º nominal
52º nominal
20 MHz
coaxial cable.
mm mounting pipe.
250 x 250 x 850 mm
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2.2 Q
UAD ARRAY DUAL POLARISED LOOP YAGI
Polarisation Horizontal and Vertical with separate feeds
Antenna Gain > 16dBi
Beam width, -3dB (parallel to polarisation
plane)
24 degrees (nominal)
24 degrees (nominal)
(perpendicular to polarisation plane)
Front-to-back ratio >20 dB
Frequency bandwidth (15dB return loss) 20 MHz
Connector arrangement 2 x Female type n connectors on combining
Harness
(Optional 1.5m tails of RG213 terminated in
2 x Male type n connectors)
Mounting 4 vertically spaced clamps for attachment to
25 to 55 mm mounting pipe. >= 50mm pipe
recommended
Number required per link end 1 for 2 receiver MIMO, 2 for 4 Receiver
MIMO
Dimensions W x H x L (direction of
910 x 910 x 860 mm
propagation)
Weight 13kg including coax tails and mounting
brackets
2.3 P
ANEL MIMO ANTENNA (HIGH WIND AND ICE TOLERANT
)
Polarisation Horizontal and vertical with separate feeds
Antenna gain >10dBi
Beam width (horizontal, vertical) 75º nominal, 32º nominal
Front-to-back ratio >20dB
Frequency bandwidth (15dB return loss) 80 MHz
Connector arrangement 2 x female 7/16 connectors
Maximum Gust Withstand Speed 250 kph
Wind loading 660N (at 150kph)
Mounting Twin vertically spaced clamps for attachment
to 48 - 114 mm mounting pipe. Provision for
additional stabilising struts (up to 4)
Number required per link end 1 for 2-receiver MIMO, 2 for 4-receiver MIMO
Dimensions W x H x T (direction of
500 x 1100 x 120 mm (+ mounting bracket)
propagation)
Left: Panel MiMO Antenna
: Quad-Array Compact
Right
Yagi
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3 MECHANICAL DIMENSIONS
8
R
ACK MOUNT MI
MOM
AX OPTIMISED PROTECTION VARIANT
(OPV)
OLE OR WALL MOUNT OPTIMISED PROTECTION VARIANT
P
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MiMOMax Wireless Ltd
www.mimomax.com
4 NOTES:
DISCLAIMER:
Whilst every precaution has been taken in the preparation of this literature and it is
believed to be correct at time of issue, MiMOMax Wireless Ltd assumes no liability for
errors or or for any damages resulting from the use of this information. Due to a policy of
continuous technical improvement the contents of this document and any specifications
contained therein are subject to revision and may change without notice.
535 Wairakei Rd
Christchurch,
New Zealand
Ph +643-358-3399
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