RTN 900 V100R019C00 MIMO User Guide 02
RTN 900 V100R019C00 MIMO User Guide 02
RTN 900 V100R019C00 MIMO User Guide 02
V100R019C00
Issue 02
Date 2020-06-30
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Related Versions
The following table lists the product versions related to this document.
NCE V100R019C00
NOTE
This document describes the principles, features, deployment, and troubleshooting of the
MIMO solution.
Intended Audience
This document is intended for the following readers:
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
General Conventions
The general conventions that may be found in this document are defined as
follows.
Convention Description
Change History
Changes between document issues are cumulative. Therefore, the latest document
issue contains all the changes made in earlier issues.
Topic Description
Contents
3 Deployment Guide................................................................................................................ 29
3.1 Commissioning for Site Deployment..............................................................................................................................30
3.1.1 One-Click XPI Query......................................................................................................................................................... 30
3.2 Configuration Example (ISM6+XMC-3 ODU)..............................................................................................................32
3.2.1 Networking Diagram........................................................................................................................................................32
3.2.2 Configuration Procedure................................................................................................................................................. 33
3.3 Configuration Example (ISM8+XMC-5D ODU).......................................................................................................... 39
3.3.1 Networking Diagram (4x4 MIMO)..............................................................................................................................39
3.3.2 Networking Diagram (4x4 MIMO+2CA)................................................................................................................... 40
3.3.3 Configuration Procedure (4x4 MIMO)....................................................................................................................... 41
3.3.4 Configuration Procedure (4x4 MIMO+2CA).............................................................................................................48
4 Maintenance Guide...............................................................................................................58
4.1 Troubleshooting..................................................................................................................................................................... 58
4.2 Alarm Reference.................................................................................................................................................................... 60
4.2.1 BUS_ERR............................................................................................................................................................................... 60
5 Parameter Reference............................................................................................................ 62
5.1 Parameter Description: Microwave Link Management............................................................................................62
This section describes the MIMO solution and its core values.
MIMO, short for Multiple-Input and Multiple-Output, is a microwave technology
in which multiple antennas are used at both the transmit and the receive ends to
transmit and receive signals, respectively. NxM MIMO indicates N channels of
output signals and M channels of input signals.
In the MIMO solution, the transmit end maps the data signal to be sent to
multiple antennas through space-time mapping before transmitting it. The receive
end recovers the data signal by performing space-time decoding on the signal that
is received by each antenna.
The MIMO solution supports two antenna installation modes: vertical separation
and horizontal separation. Vertical separation, as shown in Figure 1-1, is
recommended. Use horizontal separation if vertical separation is not allowed due
to limited space or if the pole is not high enough.
2 Feature Description
2.1 Principles
This section describes the basic principles of the MIMO feature.
2.2 System Configuration
Generally, a microwave site uses 4x4 MIMO to provide four microwave links in one
direction. RTN NEs support 4x4 MIMO when equipped with the ISM6/ISM8 board.
2.3 Specifications
This section describes the MIMO specifications that the RTN 900 supports.
2.4 Availability
This section describes the devices and boards that support the MIMO feature.
2.5 Feature Updates
This section provides a history of MIMO updates.
2.6 Feature Dependencies and Limitations
This section describes the dependencies and limitations of the MIMO feature.
2.7 RF Specifications
This section lists the RF specifications of the MIMO feature, including air interface
capacity and receiver sensitivity.
2.1 Principles
This section describes the basic principles of the MIMO feature.
NOTE
● The two IF boards at the same site must be installed in paired slots.
● The ports with the same port ID on the two IF boards at the same site must have the
same polarization direction. For example, if the polarization direction is set to H1 for
port 1 and V1 for port 2 on one IF board, the polarization direction must be set to H2
for port 1 and V2 for port 2 on the other IF board.
NOTE
● The two IF boards at the same site must be installed in paired slots.
● The ports with the same port ID on the two IF boards at the same site must have the
same polarization direction. For example, if the polarization direction is set to H1 for
port 1 and V1 for port 2 on one IF board, the polarization direction must be set to H2
for port 1 and V2 for port 2 on the other IF board.
2.3 Specifications
This section describes the MIMO specifications that the RTN 900 supports.
Item Specifications
IF running IS6
mode
Item Specifications
Decoupling < 2s
duration (with
EPLA)
Installation 0.6 to 1.2 times the Rayleigh distance (optimal: 0.9 to 1.05
distance times the Rayleigh distance)a
between
antennas at a
site
XPI alignment 18 dB to 22 dB
range
IF running IS8
mode
Decoupling < 2s
duration (4x4
MIMO with
EPLA)
Item Specifications
Installation 0.33 to 1.2 times the Rayleigh distance (optimal: 0.9 to 1.05
distance times the Rayleigh distance)a
between
antennas at a
site
XPI alignment 18 dB to 22 dB
range
NOTE
a: It is recommended that the installation distance between antennas at the same site be
0.7 to 1.2 times the Rayleigh distance.
2.4 Availability
This section describes the devices and boards that support the MIMO feature.
Hardware Requirements
Feature System Control Board IF Board ODU
Name
Version Description
Self-limitations
IF board ● The two IF boards at the same site for 4x4 MIMO
must be configured in paired slots.
● The corresponding ports on the two IF boards at the
same site for 4x4 MIMO must have consistent
polarization direction configurations. For example,
when slots 3 and 5 are used to configure MIMO, the
same polarization direction must be configured for
3-ISM8-IF1 and 5-ISM8-IF1, and the same
polarization direction must be configured for 3-
ISM8-IF2 and 5-ISM8-IF2.
● When MIMO is configured in the ISM8+XMC-5D
ODU scenario, the NEs at both ends must work in
the same IF multiplexing mode.
IF running mode ● Only the IS6 mode is supported when the ISM6
board is used.
● Only the IS8 mode is supported when the ISM8
board is used.
ODU transmit power When AM is enabled, the ODU transmit power must be
less than or equal to that allowed by the full capacity
modulation scheme.
MIMO deployment The Tx high site and the Tx low site must adopt the
same installation mode (vertical separation or
horizontal separation).
Table 2-4 Dependencies and limitations between MIMO and other features
Feature Description
● ATPC
● XPIC
● 1+1 protection
● N+1 protection
2.7 RF Specifications
This section lists the RF specifications of the MIMO feature, including air interface
capacity and receiver sensitivity.
Table 2-5 Air interface capacity of the Integrated IP microwave (IS6 mode, E1+Ethernet, 4x4 MIMO)
Table 2-6 Air interface capacity of the Integrated IP microwave (IS6 mode, STM-1+Ethernet, 4x4
MIMO)
Channel Modulation STM-1 Native Ethernet Throughput (Mbit/s)
Spacing Scheme Quantity
(MHz) of the Without With L2 With L2+L3 With L2+L3
Hybrid Frame Frame Frame Frame
Microwa Header Header Header Header
ve Compressi Compres Compressio Compression
on sion n (IPv4) (IPv6)
NOTE
● The throughput specifications listed in the tables are based on the following conditions:
● Without frame header compression: untagged Ethernet frames with a length
ranging from 64 bytes to 1518 bytes
● With L2 frame header compression: untagged Ethernet frames with a length
ranging from 64 bytes to 1518 bytes
● With L2+L3 frame header compression (IPv4): UDP packets, C-tagged Ethernet
frames with a length ranging from 70 bytes to 1518 bytes
● With L2+L3 frame header compression (IPv6): UDP packets, S-tagged Ethernet
frames with a length ranging from 94 bytes to 1518 bytes
● E1/STM-1 services occupy the bandwidth over the air interface prior to Ethernet
services, and only the remaining bandwidth can be provided for Ethernet services.
● The throughput specifications indicate the single-link performance in 1+0 networking.
4x4 MIMO
Table 2-7 Air interface capacity of the Integrated IP microwave (IS8 mode, E1+Ethernet, 4x4 MIMO)
Table 2-8 Air interface capacity of the Integrated IP microwave (IS8 mode, STM-1+Ethernet, 4x4
MIMO)
Channel Modulation STM-1 Native Ethernet Throughput (Mbit/s)
Spacing Scheme Quantity
(MHz) of the Without With L2 With L2+L3 With L2+L3
Hybrid Frame Frame Frame Frame
Microwa Header Header Header Header
ve Compressi Compres Compressio Compression
on sion n (IPv4) (IPv6)
4x4 MIMO+2CA
Table 2-9 Air interface capacity of the Integrated IP microwave (IS8 mode, E1+Ethernet, 4x4 MIMO
+2CA)
Table 2-10 Air interface capacity of the Integrated IP microwave (IS8 mode, STM-1+Ethernet, 4x4
MIMO+2CA)
Channel Modulation STM-1 Native Ethernet Throughput (Mbit/s)
Spacing Scheme Quantity
(MHz) of the Without With L2 With L2+L3 With L2+L3
Hybrid Frame Frame Frame Frame
Microwa Header Header Header Header
ve Compressi Compres Compressio Compression
on sion n (IPv4) (IPv6)
NOTE
● The throughput specifications listed in the tables are based on the following conditions:
● Without frame header compression: untagged Ethernet frames with a length
ranging from 64 bytes to 1518 bytes
● With L2 frame header compression: untagged Ethernet frames with a length
ranging from 64 bytes to 1518 bytes
● With L2+L3 frame header compression (IPv4): UDP packets, C-tagged Ethernet
frames with a length ranging from 70 bytes to 1518 bytes
● With L2+L3 frame header compression (IPv6): UDP packets, S-tagged Ethernet
frames with a length ranging from 94 bytes to 1518 bytes
● E1/STM-1 services occupy the bandwidth over the air interface prior to Ethernet
services, and only the remaining bandwidth can be provided for Ethernet services.
● The throughput specifications indicate the single-link performance in 1+0 networking.
NOTE
N/A indicates that the frequency band does not support the modulation scheme.
Table 2-11 Typical receiver sensitivity of the Integrated IP microwave (IS6 mode, 4x4 MIMO, 0.6 to
0.7 times the Rayleigh distance) (I)
@15 -85.50 -84.00 -78.50 -77.00 -74.00 -70.50 -67.50 -64.50 -61.50
GHz
@18 -85.00 -83.50 -78.00 -76.50 -73.50 -70.00 -67.00 -64.00 -61.00
GHz
@23 -85.00 -83.50 -78.00 -76.50 -73.50 -70.00 -67.00 -64.00 -61.00
GHz
@38 -83.00 -81.50 -76.00 -74.50 -71.50 -68.00 -65.00 -62.00 N/A
GHz
Table 2-12 Typical receiver sensitivity of the Integrated IP microwave (IS6 mode, 4x4 MIMO, 0.6 to
0.7 times the Rayleigh distance) (II)
Item Specifications (Channel Spacing: 56 MHz)
@15 -82.50 -81.00 -75.50 -74.00 -71.00 -67.50 -64.50 -61.50 -58.50
GHz
@18 -82.00 -80.50 -75.00 -73.50 -70.50 -67.00 -64.00 -61.00 -58.00
GHz
@23 -82.00 -80.50 -75.00 -73.50 -70.50 -67.00 -64.00 -61.00 -58.00
GHz
@38 -80.00 -78.50 -73.00 -71.50 -68.50 -65.00 -62.00 -59.00 N/A
GHz
Table 2-13 Typical receiver sensitivity of the Integrated IP microwave (IS6 mode, 4x4 MIMO, 0.6 to
0.7 times the Rayleigh distance) (III)
Item Specifications (Channel Spacing: 40 MHz)
@15 -84.00 -82.50 -77.00 -75.50 -72.50 -69.00 -66.00 -63.00 -60.00
GHz
@18 -83.50 -82.00 -76.50 -75.00 -72.00 -68.50 -65.50 -62.50 -59.50
GHz
@23 -83.50 -82.00 -76.50 -75.00 -72.00 -68.50 -65.50 -62.50 -59.50
GHz
@38 -81.50 -80.00 -74.50 -73.00 -70.00 -66.50 -63.50 -60.50 N/A
GHz
Table 2-14 Typical receiver sensitivity of the Integrated IP microwave (IS6 mode, 4x4 MIMO, 0.7 to
1.2 times the Rayleigh distance) (IV)
Item Specifications (Channel Spacing: 28 MHz)
QPSK QPSK 16QA 16QA 32QA 64QA 128Q 256Q 512Q 1024 1024
Stron M M M M AM AM AM QAM QAM
g Stron Light
g
@7 -89.0 -87.5 -82.0 -80.5 -77.5 -74.0 -71.0 -68.0 -64.5 -60.5 -58.5
GHz 0 0 0 0 0 0 0 0 0 0 0
@15 -88.5 -87.0 -81.5 -80.0 -77.0 -73.5 -70.5 -67.5 -64.5 -60.5 -58.5
GHz 0 0 0 0 0 0 0 0 0 0 0
@18 -88.0 -86.5 -81.0 -79.5 -76.5 -73.0 -70.0 -67.0 -64.0 -60.0 -58.0
GHz 0 0 0 0 0 0 0 0 0 0 0
@23 -88.0 -86.5 -81.0 -79.5 -76.5 -73.0 -70.0 -67.0 -64.0 -60.0 -58.0
GHz 0 0 0 0 0 0 0 0 0 0 0
@38 -86.0 -84.5 -79.0 -77.5 -74.5 -71.0 -68.0 -65.0 -62.0 N/A N/A
GHz 0 0 0 0 0 0 0 0 0
Table 2-15 Typical receiver sensitivity of the Integrated IP microwave (IS6 mode, 4x4 MIMO, 0.7 to
1.2 times the Rayleigh distance) (V)
Item Specifications (Channel Spacing: 56 MHz)
QPSK QPSK 16QA 16QA 32QA 64QA 128Q 256Q 512Q 1024 1024
Stron M M M M AM AM AM QAM QAM
g Stron Light
g
@7 -86.0 -84.5 -79.0 -77.5 -74.5 -71.0 -68.0 -65.0 -61.5 -57.5 -55.5
GHz 0 0 0 0 0 0 0 0 0 0 0
@15 -85.5 -84.0 -78.5 -77.0 -74.0 -70.5 -67.5 -64.5 -61.5 -57.5 -55.5
GHz 0 0 0 0 0 0 0 0 0 0 0
@18 -85.0 -83.5 -78.0 -76.5 -73.5 -70.0 -67.0 -64.0 -61.0 -57.0 -55.0
GHz 0 0 0 0 0 0 0 0 0 0 0
@23 -85.0 -83.5 -78.0 -76.5 -73.5 -70.0 -67.0 -64.0 -61.0 -57.0 -55.0
GHz 0 0 0 0 0 0 0 0 0 0 0
@38 -83.0 -81.5 -76.0 -74.5 -71.5 -68.0 -65.0 -62.0 -59.0 N/A N/A
GHz 0 0 0 0 0 0 0 0 0
Table 2-16 Typical receiver sensitivity of the Integrated IP microwave (IS6 mode, 4x4 MIMO, 0.7 to
1.2 times the Rayleigh distance) (VI)
Item Specifications (Channel Spacing: 40 MHz)
QPSK QPSK 16QA 16QA 32QA 64QA 128Q 256Q 512Q 1024 1024
Stron M M M M AM AM AM QAM QAM
g Stron Light
g
@7 -87.5 -86.0 -80.5 -79.0 -76.0 -72.5 -69.5 -66.5 -63.5 -59.0 -57.0
GHz 0 0 0 0 0 0 0 0 0 0 0
@15 -87.0 -85.5 -80.0 -78.5 -75.5 -72.0 -69.0 -66.0 -63.0 -59.0 -57.0
GHz 0 0 0 0 0 0 0 0 0 0 0
@18 -86.5 -85.0 -79.5 -78.0 -75.0 -71.5 -68.5 -65.5 -62.5 -58.5 -56.5
GHz 0 0 0 0 0 0 0 0 0 0 0
@23 -86.5 -85.0 -79.5 -78.0 -75.0 -71.5 -68.5 -65.5 -62.5 -58.5 -56.5
GHz 0 0 0 0 0 0 0 0 0 0 0
@38 -84.5 -83.0 -77.5 -76.0 -73.0 -69.5 -66.5 -63.5 -60.5 N/A N/A
GHz 0 0 0 0 0 0 0 0 0
NOTE
1024QAM Light is supported only when the antenna installation distance is 0.9 to 1.05
times the Rayleigh distance.
NOTE
N/A indicates that the frequency band does not support the modulation scheme.
Table 2-17 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.33 to
0.4 times the Rayleigh distance) (I)
Item Specifications (Channel Spacing: 28 MHz)
Table 2-18 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.33 to
0.4 times the Rayleigh distance) (II)
Item Specifications (Channel Spacing: 56 MHz)
Table 2-19 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.4 to
0.6 times the Rayleigh distance) (III)
Item Specifications (Channel Spacing: 28 MHz)
@13/15 -79.50 -78.00 -72.50 -71.00 -68.00 -64.50 -61.50 -58.50 -55.50
GHz
@18 -79.00 -77.50 -72.00 -70.50 -67.50 -64.00 -61.00 -58.00 -55.00
GHz
Table 2-20 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.4 to
0.6 times the Rayleigh distance) (IV)
Item Specifications (Channel Spacing: 56 MHz)
@13/15 -76.50 -75.00 -69.50 -68.00 -65.00 -61.50 -58.50 -55.50 -52.50
GHz
@18 -76.00 -74.50 -69.00 -67.50 -64.50 -61.00 -58.00 -55.00 -52.00
GHz
Table 2-21 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.6 to
0.7 times the Rayleigh distance) (V)
Item Specifications (Channel Spacing: 28 MHz)
QPSK QPSK 16QA 16QA 32QA 64QA 128QA 256Q 512Q 1024
Strong M M M M M AM AM QA
Strong M
@13/1 -86.00 -84.50 -79.00 -77.50 -74.50 -71.00 -68.00 -65.0 -62.0 -58.0
5 GHz 0 0 0
@18 -85.50 -84.00 -78.50 -77.00 -74.00 -70.50 -67.50 -64.5 -61.5 -57.5
GHz 0 0 0
Table 2-22 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.6 to
0.7 times the Rayleigh distance) (VI)
Item Specifications (Channel Spacing: 56 MHz)
QPSK QPSK 16QA 16QA 32QA 64QA 128QA 256Q 512Q 1024
Strong M M M M M AM AM QA
Strong M
@13/1 -83.00 -81.50 -76.00 -74.50 -71.50 -68.00 -65.00 -62.00 -59.0 -55.0
5 GHz 0 0
@18 -82.50 -81.00 -75.50 -74.00 -71.00 -67.50 -64.50 -61.50 -58.5 -54.5
GHz 0 0
Table 2-23 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.7 to
0.9/1.05 to 1.2 times the Rayleigh distance) (VII)
Item Specifications (Channel Spacing: 28 MHz)
QPSK QPSK 16QA 16QA 32QA 64QA 128Q 256Q 512 102 2048
Stron M M M M AM AM QA 4QA QA
g Stron M M M
g
@13/1 -88.50 -87.00 -81.50 -80.00 -77.00 -73.50 -70.50 -67.50 -64. -60. -57.5
5 GHz 50 50 0
@18 -88.00 -86.50 -81.00 -79.50 -76.50 -73.00 -70.00 -67.00 -64. -60. -57.0
GHz 00 00 0
Table 2-24 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.7 to
0.9/1.05 to 1.2 times the Rayleigh distance) (VIII)
Item Specifications (Channel Spacing: 56 MHz)
QPSK QPSK 16QA 16QA 32QA 64QA 128Q 256Q 512 102 2048
Stron M M M M AM AM QA 4QA QA
g Stron M M M
g
@13/1 -85.50 -84.00 -78.50 -77.00 -74.00 -70.50 -67.50 -64.50 -61. -57. -54.5
5 GHz 50 50 0
@18 -85.00 -83.50 -78.00 -76.50 -73.50 -70.00 -67.00 -64.00 -61. -57. -54.0
GHz 00 00 0
Table 2-25 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.9 to
1.05 times the Rayleigh distance) (IX)
Item Specifications (Channel Spacing: 28 MHz)
QPSK QPS 16Q 16Q 32Q 64Q 128 256Q 512 1024 2048 4096
Stron K AM AM AM AM QAM AM QA QAM QAM QAM
g Stro M
ng
@13/ -88.5 -87. -81. -80. -77.0 -73.5 -70.5 -67.5 -64.5 -60.5 -57.5 -54.50
15 0 00 50 00 0 0 0 0 0 0 0
GHz
@18 -88.0 -86. -81. -79. -76.5 -73.0 -70.0 -67.0 -64.0 -60.0 -57.0 N/A
GHz 0 50 00 50 0 0 0 0 0 0 0
Table 2-26 Typical receiver sensitivity of the Integrated IP microwave (IS8 mode, 4x4 MIMO, 0.9 to
1.05 times the Rayleigh distance) (X)
Item Specifications (Channel Spacing: 56 MHz)
QPSK QPS 16Q 16Q 32Q 64Q 128 256Q 512 1024 2048 4096
Stron K AM AM AM AM QAM AM QA QAM QAM QAM
g Stro M
ng
@13/ -85.5 -84. -78. -77. -74.0 -70.5 -67.5 -64.5 -61.5 -57.5 -54.5 -51.50
15 0 00 50 00 0 0 0 0 0 0 0
GHz
@18 -85.0 -83. -78. -76. -73.5 -70.0 -67.0 -64.0 -61.0 -57.0 -54.0 N/A
GHz 0 50 00 50 0 0 0 0 0 0 0
3 Deployment Guide
It is recommended that the installation distance between antennas at the same site be
0.7 to 1.2 times the Rayleigh distance.
● The maximum transmission distance of microwave links is 7 km in the
ISM6+XMC-3 ODU scenario. The maximum transmission distance of
microwave links is 8.5 km in the ISM8+XMC-5D ODU scenario.
● QPSK is recommended as the guaranteed capacity modulation scheme.
● The length difference between IF cables at the same site must be less than 2
m.
● The main factors that affect transmission performance include internal factors
and external factors. The internal factors include the frequency, site
transmission distance, and antenna distance. The external factors include
terrain and multipath effect. Avoid using MIMO for cross-water surface
transmission if possible.
3.1 Commissioning for Site Deployment
The purpose of site commissioning is to establish MIMO links and ensure that the
XPI value of each link is adjusted to be within the range specified in the network
plan.
3.2 Configuration Example (ISM6+XMC-3 ODU)
This section exemplifies how to configure 4x4 MIMO microwave links when the
XMC-3 ODU is used.
Data Preparation
NOTICE
After a MIMO group is configured, querying the XPI values in one-click mode will
interrupt the links.
NOTE
● This operation can also be performed on the Web LCT and the procedure is similar to
that on the NCE.
● This section uses the ISM8 board as an example and the procedure for the ISM6 board is
similar.
Procedure
Step 1 Query XPI values in one-click mode.
----End
NOTE
This operation can also be performed on the Web LCT and the procedure is similar to that
on the NCE.
NE 1 and NE 2 are RTN 950 NEs and are configured with 4x4 MIMO. Figure 3-2
shows the data planned for the microwave links. NE 1 and NE 2 have the same
board configurations, as shown in Figure 3-3.
Data Preparation
MIMO Type 4*4 MIMO (Not In the current version, only 4*4 MIMO (Not
Cascaded) Cascaded) is available.
Polarization- H2
3 5-
ISM6-1(RTNIF-1)
Polarization- V2
4 5-
ISM6-2(RTNIF-2)
Procedure
Step 1 Configure a MIMO group.
NOTE
Maximum Transmission Power(dBm) must be set to a value less than or equal to the
maximum transmit power allowed by the full capacity modulation scheme.
If Full Capacity Modulation is set to 1024QAM Light, set Full Capacity Modulation to
another value and then delete the MIMO group.
Deleting the MIMO group from the peer NE first is recommended.
Alternatively, you can delete a MIMO group in the MIMO Configuration interface.
----End
NOTE
This operation can also be performed on the Web LCT and the procedure is similar to that
on the NCE.
Prerequisites
Before configuring MIMO microwave links, ensure that Conflux Mode is set to
Share ODU for the XMC-5D ODU.
Data Preparation
MIMO Type 4*4 MIMO (Not Cascaded) In the current version, only 4*4
MIMO (Not Cascaded) is available.
Polarization-4 V2
5-ISM8-2(RTNIF-2)
Procedure
Step 1 Configure a MIMO group.
NOTE
Maximum Transmission Power(dBm) must be set to a value less than or equal to the
maximum transmit power allowed by the full capacity modulation scheme.
Alternatively, you can delete a MIMO group in the MIMO Configuration interface.
----End
Prerequisites
There are two ways to configure 4x4 MIMO+2CA:
● Configure 4x4 MIMO on the master links, then four 2CA groups, and finally
4x4 MIMO on the slave links.
● Configure four 2CA groups, then 4x4 MIMO on the master links, and finally
4x4 MIMO on the slave links.
Data Preparation
Running IS8 -
mode of the
IF port
MIMO Type 4*4 MIMO (Not 4*4 MIMO (Not In the current version, only 4*4 MIMO
Cascaded) Cascaded) (Not Cascaded) is available.
Polarization-3 H2 H2
5-ISM8-1(RTNIF-1) 6-
ISM8-1(RTNIF-1
)
Polarization-4 V2 V2
5-ISM8-2(RTNIF-2) 6-
ISM8-2(RTNIF-2
)
Procedure
Step 1 Change the mode of the cascade port on the NE to CA. NE 1 is used as an
example, on which the mode must be set for ports 3-ISM8-3, 4-ISM8-3, 5-ISM8-3,
and 6-ISM8-3.
Step 5 Configure MIMO group 1 and MIMO group 2. MIMO group 1 is used as an
example.
NOTE
Maximum Transmission Power(dBm) must be set to a value less than or equal to the
maximum transmit power allowed by the full capacity modulation scheme.
----End
4 Maintenance Guide
This section describes how to troubleshoot typical MIMO faults and handle related
alarms.
4.1 Troubleshooting
This section describes how to troubleshoot MIMO faults.
4.2 Alarm Reference
This section describes the possible alarms for MIMO and how to handle them.
4.1 Troubleshooting
This section describes how to troubleshoot MIMO faults.
NOTE
● Fault point 2: When the ISM6 board becomes faulty, links and services on the board are
interrupted, and MIMO decoupling is triggered to prevent other links and services in the
MIMO group from being affected. After the fault is rectified, all links and services in the
MIMO group are normal.
● Fault point 3: An ODU fault occurs, triggering MIMO decoupling. After the fault is
rectified, all links and services in the MIMO group are normal.
NOTE
For details about how to handle alarms reported on each fault point, see Maintenance
Guide for the RTN 900.
4.2.1 BUS_ERR
Description
The BUS_ERR alarm indicates that the backplane bus is faulty.
Attribute
Alarm Severity Alarm Type
Parameters
Name Meaning
Parameter 1 For the ISM6/ISM8 board, when parameter 1 is 0x0A, the MIMO
SerDes backplane bus is abnormal.
Possible Causes
The possible causes of the BUS_ERR alarm are as follows:
Procedure
Step 1 Cause 1: The board is not securely inserted.
1. Reseat the board by referring to Removing a Board and Inserting a Board.
2. Check whether the BUS_ERR alarm is cleared. If the alarm persists, go to the
next step.
Step 2 Cause 2: The board is faulty.
1. Perform a cold reset on the board that reports the alarm by referring to Cold
Reset.
2. Check whether the BUS_ERR alarm is cleared. If the alarm persists, replace the
board by referring to Parts Replacement for the RTN 900.
Step 3 Cause 3: The NE backplane is faulty.
1. Replace the backplane by referring to Parts Replacement for the RTN 900.
Step 4 Check whether the BUS_ERR alarm is cleared. If the alarm persists, contact Huawei
technical support engineers.
----End
Related Information
None
5 Parameter Reference
Navigation Path
1. In the NE Explorer, select the desired NE from the object tree. Choose
Configuration > Microwave Link Configuration from the function tree.
Basic Parameters
Parameter Value Range Default Value Description
MIMO Type 4*4 MIMO (Not 4*4 MIMO (Not ● This parameter is valid only when
Cascaded) Cascaded) MIMO is selected.
● This parameter specifies the MIMO
configuration type. 4*4 MIMO
(Not Cascaded) indicates that
four IF ports in paired slots on an
NE are configured as a 4x4 MIMO
group.
IF Parameters
Parameter Value Range Default Value Description
RF Parameters
Parameter Value Range Default Value Description
Navigation Path
1. In the NE Explorer, select the desired NE from the object tree. Choose
Configuration > MIMO Configuration from the function tree.
2. Click New.
Basic Parameters
Parameter Value Range Default Value Description
MIMO Type 4*4 MIMO (Not 4*4 MIMO (Not ● This parameter is valid only when
Cascaded) Cascaded) MIMO is selected.
● This parameter specifies the MIMO
configuration type. 4*4 MIMO
(Not Cascaded) indicates that
four IF ports in paired slots on an
NE are configured as a 4x4 MIMO
group.
Navigation Path
● In the NE Explorer, select the desired board from the object tree. Choose
Configuration > IF Conflux Port Management from the function tree.
Parameters
Parameter Value Range Default Value Description
Role Source Port Source Port This parameter specifies the role of
Destination Port an IF port.
This parameter is configurable only
when Conflux Mode is set to Share
ODU.