MINILINK-TN
Presented By
Nitesh Prajapati
INSTALLATION WORKFLOW
Safety Requirements
 Installation and Maintenance Personnel:- Installation and
maintenance must be carried out by authorized personnel
with the appropriate technical training and experience
necessary to be cognizant of hazards during installation
and maintenance, and of measures to minimize any danger
to themselves or any other person.
 Access to Equipment
The equipment must be installed in a restricted access
location and access shall be restricted to authorized
personnel.
 Installation Hardware
Do not use any installation components (for example screws
and nuts) other than what is enclosed with the equipment
or recommended by Ericsson.
Introduction
 The MINI-LINK terminal consists of an outdoor
and an indoor part.
 The outdoor part A consists of an antenna, a
Radio Unit (RAU) and associated installation
hardware. For protected single polarized
systems, two radio units and one or two
antennas are used. For protected dual
polarized systems, four radio units and one or
two antennas are used.
 The radio unit is connected to the indoor part
with a single coaxial cable B.
 The indoor part C.
Outdoor and Indoor Units
Radio unit
 The radio unit is a microwave radio
with RF transceivers, which transmit
and receive RF signals. Traffic signals
from the indoor units are processed
and converted to transmitter
frequency and sent over the hop.
 The radio unit is a weatherproof box
with a handle for lifting and hoisting.
It has two guiding hooks and catches
to enable handling with one hand
during installation. It can be
disconnected and replaced without
affecting the antenna alignment.

MINI-LINK TN offers far more flexibility than any other microwave radio system
due to its flexible architecture. The integrated MINI-LINK TN radio terminals
provides microwave transmission from 2x2 to 32x2 Mbit/s, operating within the 7
to 38 GHz frequency bands, utilizing C-QPSK and 16 QAM modulation schemes.
It can be configured as unprotected (1+0) or protected configuration. Capacity
increase has been a main driver when developing the MINI-LINK TN and
increased capacity is gradually introduced. In fact 64xE1/128 QAM capacity is
already supported by MINI-LINK TN considering the traffic handling capability
and the new radio unit.
Frequency band
 7 GHz
 8 GHz
C-QPSK
 13 GHz
 15 GHz
16 QAM
2-16xE1
4-32xE1
 18 GHz
128 QAM*
64xE1*
•23 GHz
•26 GHz
•28 GHz
•32 GHz
• 38 GHz
Antenna
 The antennas range from 0.2 m (9”) to 3.7 m (12 ft)
in diameter, in single and dual polarized versions. All
antennas are “compact”, that is the design is
compact with a low profile. This manual describes
single and dual polarized antennas with a diameter
of up to 0.6 m (2 ft)
 The 0.2 – 1.8 m single polarized, and 0.3 — 0.6 m
dual polarized antennas are normally fitted
integrated with the radio unit.
 All antennas can be fitted separately from the radio
unit. However, for separately installed single
polarized antennas a flexible waveguide must be
used.
 For the single polarized antennas, it is possible to
choose between vertical and horizontal
polarization.
Antenna Support
A 0.2 m antenna support (9")
B 0.3 – 0.6 m antenna support (1 – 2 ft)
A Radio cable
B Connectors(1)
C Marking tape, marking tag and straps(1)
D Sealing compound and tape(1)
E Radio cable adapter(1)
F Radio earthing kit (enclosed in the radio
delivery)
G Cable clamp kit
H Radio cable earthing kit
I Wall gland
Indoor Part
Microwave radio function
19 modems per sub rack in AMM 20p – 20 positions, where one is allocated by the NPU allows
up to 19 slots available for expansion with any combination of circuit-boards e.g. all MMU:s.
5 modems per sub rack in AMM 6p – 6 positions, where one is allocated by the NPU, allows up
to 5 slots available for expansion with any combination of circuit-boards e.g. all MMU:s.
2 modems per subrack in AMM 2p - 2 positions both available for modem units, allows AMM 2p
to act as a repeater site or a protected microwave terminal.
Software configurable traffic capacity – Modems are software configurable up to its maximum
capacity (4 Mbit/s for MMU2 4, 8 Mbit/s for MMU2 4-8, 16 Mbit/s for MMU2 4-16, 34+2 Mbit/s
for MMU2 4-34)
Fully compatible with installed base of MINI-LINK E radios – Very important is that the new
MINI-LINK TN modems interfaces towards existing radios (RAU1 and RAU2) which allows
migration to a MINI-LINK TN site without having to change anything in the outdoor
installations including the radio cabling. Likewise important is that also the air interface allows
the combination of a MINI-LINK E on one end of the radio hop, and a MINI-LINK TN on the
other side of the radio hop.
Indoor Part with AMM
Access Module Magazine (AMM)
Houses the plug-in units and provides backplane interconnection of traffic, power and
control signals.
Node Processor Unit (NPU)
Handles the system’s control functions. It also provides traffic and management
interfaces.
Line Termination Unit (LTU)
A plug-in unit that provides PDH or SONET trafficinterfaces.
Ethernet Interface Unit (ETU2)
A plug-in unit that provides Ethernet interfaces.
Modem Unit (MMU)
The indoor part of a Radio Terminal. This plug-in unit determines the traffic capacity
of the Radio Terminal.
ATM Aggregation Unit (AAU)
A plug-in unit that provides aggregation of ethernet traffic.
Switch Multiplexer Unit (SMU)
Provides protection for the Radio Terminals.Alternatively it can be configured
to interface MINI-LINK E equipment on the same site.
Power Filter Unit (PFU)
Filters the external power and distributes the internal power to the plug-in
units via the backplane.
Fan Unit (FAU)
Provides cooling for the indoor part.
The interconnection between the outdoor part (Radio Units and antennas) and
the indoor part is one coaxial cable per MMU carrying full duplex traffic, DC
supply voltage, as well as operation and maintenance data.
AMM
One plug-in unit occupies one slot in the
AMM. Protected pairs, for example two MMUs in a protected (1+1) Radio
Terminal, are positioned in adjacent slots starting with an even slot number.
The AMM fits into standard 19" or metric racks and cabinets. It is available in
three sizes described below.
AMM 2p
The AMM 2p is suitable for end site and repeater site applications. It has two
half-height slots equipped with one NPU2 A and the optional LTU 12xDS1. Two
full-height slots can be equipped with MMU, LTU or ETU. The FAU4 is used
depending on the configuration.
Plug in unit for 2p AMM
4x2 Mbit/s
(120ohm)
+24/-48 VDC
USB
4x2 Mbit/s
(120ohm)
10/100 BaseT
4x2 Mbit/s
(120ohm)
Leds
4x2 Mbit/s
(120ohm)
AMM 2p B
AMM 2p B has two half-height slots equipped with one NPU3 and the optional
LTU3 12/1LTU 3/3. Two full-height slots can be equipped with MMU, LTU
or ETU. The FAU4 is used depending on the configuration. The difference
compared to AMM 2p is the power supply for AMM 2p B. AMM 2p B is power
supplied by –48 V DC or +24 V DC redundant power. Two DC connectors at
the left side of the front panel are connected to the backplane. To achieve
redundant power, two power sources must be connected.
AMM 6p
The AMM 6p is suitable for medium-sized hub sites. It has six full-height slots
and two half-height slots and it houses one NPU1 BA or NPU1 ANSI, one
PFU2 and one FAU2. The remaining slots are equipped with MMU, LTU, ETU
and SMU.
Plug in Unit and FAN Unit
PFU 2(Power
Filter unit)
FAU 2
Node Processor Unit for AMM
6p/AMM 20p (NPU 8x2)
• Centralized node processor with DCN
router,
SNMP Master Agent etc.
• 10 BASE-T Ethernet interface for
management
• E1 interfaces for local add-drop
• User In-/Output signals
AMM 6P and AMM 20P
Switch Multiplexer Unit (SMU2)
• Triple function plug-in unit
• Two MMU2s and one SMU2 for 1+1
protection
• External channelized 34 Mbit/s interfaces
• Co-siting interfaces with MINI-LINK E
AMM 6p B
The AMM 6p B is the successor of AMM 6p, providing power redundancy. It
has six full-height slots and two half-height slots and it houses one NPU1 BA
or NPU1 ANSI, one or two PFU3 (in one half-height slot) and one FAU2. The
remaining slots are equipped with MMU, LTU, ETU and SMU.
AMM 6p C/D
AMM 6p C or D have four (D) or five (C) full-height horizontal slots, four (D) or
two (C) half-height horizontal slots and two half-height vertical slots. They
house one NPU3, one or two PFU3 B (in one slot) and one FAU2. The
remaining slots in AMM 6p C/D can be equipped with MMU, LTU, ETU or SMU.
AMM 6p C
AMM 20p
The AMM 20p is suitable for large-sized hub sites, for example at the
intersection between the optical network and the microwave network. It has
20 full-height slots and two half-height slots and it houses one NPU1 BA or
NPU1 ANSI, and one or two PFU1. The remaining slots are equipped with
MMU, LTU, ETU and SMU.
A cable shelf is fitted directly underneath the AMM to enable neat handling of
cables connected to the fronts of the plug-in units. An FAU1 is fitted on top
of the AMM unless forced air-cooling is provided. An air guide plate is fitted
right above the FAU1.
AMM 20p
FAN Unit (FAU1)
PFU 1
AMM 20p B
The AMM 20p B is suitable for large-sized hub sites, for example at the
intersection between the optical network and the microwave network. It has
20 full-height slots, one housing an NPU1 B and two half-height slots housing
one or two PFU1.
The remaining slots can be equipped with MMU, LTU and ETU. Protected pairs,
require two MMUs in a protected (1+1) Radio Terminal, and are positioned in
adjacent slots starting with an even slot number.
A cable shelf is fitted directly underneath the subrack to enable neat handling of
cables connected to the fronts of the plug-in units.
An FAU1 is fitted on top of the subrack unless forced air-cooling is provided. An
air guide plate is fitted right above the FAU1.
AMM 20p B can be fitted in a standard 19" or metric rack. The subrack with
FAU1, cable shelf and air guide plate has a total height of 10U.
MMU 2
Modem Unit (MMU2)
• C-QPSK modulation
• Software-configurable capacity; 4-34 Mbit/s
• Compatible over the air with MINI-LINK E
• 1+1 protection via SMU2
MMU2 A traffic capacity agile plug-in unit for C-QPSK
modulation, used for the following traffic capacities in Mbit/s:
• 4xDS1, 8xDS1, 16xDS1
A protected (1+1) Radio Terminal requires two MMU2 units and one SMU2 ANSI.
MMU2 BA A traffic capacity agile plug-in unit for C-QPSK
modulation, used for the following traffic capacities:
• 4xDS1, 8xDS1, 16xDS1
MMU2 CA A traffic capacity and modulation agile plug-in unit,
used for the following modulation schemes and traffic capacities:
• C-QPSK: 4xDS1, 8xDS1, 16xDS1
• 16 QAM: 4xDS1, 8xDS1, 16xDS1, 32xDS1
• 32 QAM: 8xDS1
• 128 QAM: 16xDS1, 32xDS1
The use of the different capacities and modulation scheme depends on frequency band.
MMU2 F 155 A high capacity SONET plug-in unit with XPIC support,
used for the following modulation schemes and traffic
capacities in Mbit/s:
• 16 QAM: OC-3/STS-3 + DS1
• 64 QAM: OC-3/STS-3 + DS1
• 128 QAM: 2xOC-3/STS-3 + 2xDS1 (requires
2xMMU2 E/F 155)
XPIC is only used in combination with 128 QAM. If XPIC
is not used, MMU2 F 155 has the same modulation
schemes and traffic capacities as MMU2 E 155.
MMU 2C
Antenna Alignment
 This is performed to optimize the path of propagation between the
two sites (near-end and far-end), in order to transfer the signal with
as small loss as possible.
 Note: Before the alignment starts, make sure the power supply is
within specified voltage range. For more information, see the
applicable MINI-LINK Indoor Installation Manual.




Step 1 Make sure all MINI-LINK equipment is installed on both the far-end and
near-end sites.
Step 2 Make sure all required tools, units and accessories are available,
Step 3 Align the antennas
Step 4 Transform and compare the alignment value
1. Arrange for communication between the sites, to coordinate alignment
actions.
2. Align both antennas roughly, but as accurately as possible.
3. Turn the transmitter on.
Note: The transmitter is turned off on
delivery in order not to transmit RF
power before the operation frequency is set
and has to be turned
on manually during installation.
Note: If the radio is equipped with
Automatic Transmitter Power Control
(ATPC) make sure the function is turned off
during alignment.
4. Connect the voltmeter to the alignment port A on the connection interface
of the radio unit. Use the alignment test cable.
The voltmeter is used to measure and find the maximum alignment value
during the alignment procedure.
Azimuth Alignment
1. Loosen the vertical axis locking screw A.
2. Adjust the antenna horizontally for maximum alignment value.
Note: Rotate the entire scope of the antenna to find the main lobe. Side
lobes may peak without achieving maximum value.
3. Tighten the locking screw when maximum value is found.
Elevation Alignment
4. Loosen the horizontal axis locking screws B.
5. Adjust the antenna in the vertical plane for maximum alignment value.
Note: Rotate the entire scope of the antenna to find the main lobe. Side
lobes may peak without achieving maximum value.
6. Tighten the locking screws when maximum value is found.
7. Repeat instructions 1 – 6 until the maximum alignment value is found.
8. Measure the alignment level and record the value.
Aligning the 0.3 m and 0.6 m Antenna (1 ft and 2 ft)
Azimuth Alignment
1. Loosen the locking screws A and B.
2. Adjust the antenna horizontally for maximum alignment value using the
azimuth adjustment screw C.
Note: Rotate the entire scope of the antenna to find the main lobe. Side
lobes may peak without achieving maximum value.
3. Tighten the locking screws A and B when maximum value is found.
4. Loosen the locking screws D and E.
5. Adjust the antenna in the vertical plane for maximum alignment value using
the elevation adjustment screw F.
Note: Rotate the entire scope of the antenna to find the main lobe. Side
lobes may peak without achieving maximum value.
6. Tighten the locking screws D and E when maximum value is found.
Note: Do not tighten the elevation adjustment screw F.
7. Repeat instructions 1 – 6 until the maximum alignment value is found.
8. Measure the alignment level and record the value.
Transforming the Alignment Value
The figure below shows an alignment curve that transforms the
alignment level in volts into RF input level in dBm.