1 - otf202101 optix rtn 910950 v100r002 hardware description issue 1.00
DESCRIPTION
Huawei RTN 910/950 IDU Configuration and ExplanationTRANSCRIPT
OptiX RTN 910/950 Hardware Description
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Contents
OptiX RTN 910/950 Product Overview................................................Page3
OptiX RTN 910/950 Product Structure.................................................Page19
OptiX RTN 910/950 Product Protection ...............................................Page103
OptiX RTN 910/950 Hardware Description
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After the course, trainees should summarize the main characteristics of OptiX RTN
910/950,be clear the general structure of the system and functions of every parts.
Depending on the protection schemes introduced in the course, trainees should also
explain the protection modes application in the OptiX RTN 910/950 system, also the
trainees should be clear the function of AM (Adaptive Modulation) and Hybrid
Microwave.
The Hybrid Microwave indicates the hybrid transmission of E1 services and Ethernet
services.
"AM" stands for adaptive modulation. The AM function can automatically adjust the
modulation scheme according to the channel quality. The QPSK, 16QAM, 32QAM,
64QAM, 128QAM, and 256QAM can be used as the modulation scheme. The AM is
used only in the hybrid microwave.
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OptiX RTN 910/950 Hardware Description
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The OptiX RTN 910/950 is a new generation split microwave transmission system
developed by Huawei. It can provide a seamless microwave transmission solution for
a mobile communication network or private network.
The OptiX RTN 910/950 provides several types of service interfaces and facilitates
installation and flexible configuration. It can provide a solution that is integrated with
the TDM microwave, hybrid microwave, and packet microwave according to the
network requirements. It supports the smooth upgrade from the TDM microwave to
the hybrid microwave, and from the hybrid microwave to the packet microwave. The
solution can evolve based on the service changes that may occur due to radio mobile
network evolution. Thus, this solution can meet the transmission requirements of not
only 2G and 3G networks, but also LTE and 4G networks.
The TDM microwave transmission solution and the hybrid microwave transmission
solution respectively that are provided by the OptiX RTN 910/950 for the mobile
communication network.
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From the lower to the upper, the OptiX RTN 910/950 equipment consists of in-door
unit (IDU), intermediate frequency (IF) cable, out-door unit (ODU), hybrid coupler,
pole, and antenna.
The hybrid coupler is optional, only necessary when two ODUs need to be connected
to one antenna.
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The OptiX RTN 910/950 products are available in two types: OptiX RTN 910 and
OptiX RTN 950. The IDU of the OptiX RTN 910 is 1U high and supports one or two IF
boards. The IDU of the OptiX RTN 950 is 2U high and supports one to six IF boards.
The users can choose an appropriate type according to the actual requirements.
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The IF cable provides -48V power for ODU and transmits the IF signal and ODU
management signal between IDU and ODU.
IF jumper is one type of soft cable which help the chassis to be installed in the
300mm cabinet.
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The ODU is round and installed behind the antenna. It enables the conversion
between the IF analog signal and radio frequency (RF) signal, and amplifying the RF
signal. The ODU is irrelevant to the microwave transmission capacity. An ODU of the
OptiX RTN 910/950 can support the transmission capacity from 4xE1 to 1xSTM-1 in
SDH/PDH microwave system, and from 10Mbps(Max. E1 is 5) to 363Mbps(Max E1 is
75) in hybrid microwave system. When one ODU is configured for an antenna, install
the ODU behind the antenna directly or separately connected to the antenna through
a flexible waveguide . If two ODUs are configured for an antenna, the two ODUs are
connected to the antenna through a hybrid coupler.
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The ODU is the outdoor unit of the OptiX RTN 910/950. It performs frequency
conversion and amplification of signals.
The OptiX RTN 910/950 series products share one set of ODUs.The OptiX RTN 910
supports standard power ODU, high power ODU, and low capacity for PDH ODU.
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The OptiX RTN 950 support standard power ODU and high power ODU.
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When two ODUs share one antenna, the ODUs must be connected to a hybrid
coupler whose full name is RF signal coupler/splitter. The hybrid coupler is a part of
an irregular shape with three interfaces. Two of them are ODU interfaces and one is
the antenna interface. The main function of the hybrid coupler is to couple and split
the RF signal.
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There are two methods of mounting the ODU and the antenna: direct mounting and
separate mounting. The direct mounting method is normally adopted when a small-
diameter and single-polarized antenna is used. In this situation, if one ODU is
configured for one antenna, the ODU is directly mounted at the back of the antenna. If
two ODUs are configured for one antenna, an RF signal combiner/splitter (hereinafter
referred to as a hybrid coupler) must be mounted to connect the ODUs to the antenna.
The separate mounting method is adopted when a double-polarized antenna or big-
diameter and single-polarized antenna is used. In this situation, a hybrid coupler can
be mounted. That is, two ODUs share one feed boom.
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SNCP:Sub-network Connection Protection
XPIC: Cross-polarization interference cancellation
ATPC:Automatic Transmit Power Control
LMSP: Linear Multiplex Section Protection
ERPS:Ethernet Ring Protection Switching
LAG: Link Aggregation
MSTP:Multiple Spanning Tree Protocol
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Adaptive modulation (AM) is a technology wherein the modulation mode can be adjusted automatically according to the channel quality.
In the case of the same channel spacing, the microwave service bandwidth varies according to the modulation mode. The higher the modulation efficiency, the higher the bandwidth of the transmitted services. When the channel quality is favorable (such as on days when the weather is favorable), the equipment adopts a higher modulation mode to try to transmit more user services. In this manner, the transmission efficiency and the spectrum utilization of the system are improved. When the channel quality is degraded (such as on days when the weather is stormy and foggy), the equipment adopts a lower modulation mode to transmit only the services with a higher priority within the available bandwidth and to discard the services with a lower priority. In this manner, the anti-interference capability of a link is improved and the link availability of the services with a higher priority is ensured.
When the hybrid microwave equipment adopts the AM technology, it controls service transmission based on the service bandwidth and QoS policy corresponding to the current modulation mode. The E1 services have the highest priority. By adopting the CoS technology, the equipment schedules Ethernet services of different types to the queues with different priorities. The services in the queues of different priorities are transmitted to the microwave port. When the queues of certain priorities are congested because of insufficient microwave bandwidth, the queues of these priorities discard certain or all services. When the hybrid microwave works in the lowest modulation mode, the equipment transmits only the E1 services and the Ethernet services of the high priority on the available bandwidth. When the Hybrid microwave works in any other modulation mode, all the additional bandwidth is used to transmit the Ethernet services. In this manner, the availability of the links that carry the E1 services and the Ethernet services of the high priority is ensured and the Ethernet service capacity is increased, thus providing the dynamic bandwidth.
Slide shows the service change caused by the AM. The orange part indicates the E1 services. The blue part indicates the Ethernet services. The closer to the edge of the blue part, the lower the priority of the Ethernet service. Under all channel conditions, the E1 services occupy the specific bandwidth that is permanently available. Thus, the availability of the E1 services is ensured. The bandwidth for the Ethernet services varies according to the channel conditions. When the channel is in bad conditions, the Ethernet services of the low priority are discarded.
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What are the components of the OptiX RTN 910/950?
Six parts, IDU, IF cable, ODU, hybrid coupler, antenna and pole
What are the functions of them?
IDU process the service signal (baseband signal) and converting it between
intermediate frequency signal.
IF cable transmitting and receiving the IF signal, ODU management signal and
-48V DC power of ODU between ODU and IDU.
ODU process the conversion between IF signal and RF signal.
Hybrid couple is used to combined or split the RF signal between ODUs and
antenna.
The pole is just used to support the antenna in the hardware installation.
What are the connection relations between the components?
IDUIF cable ODU Hybrid coupler antenna
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Functional Unit Function
Service interface unit Accesses E1/STM-1/Ethernet signals
Timeslot cross-connect unit Provides the cross-connect function and grooms TDM
services
Packet switching unit Processes Ethernet services and forwards packets
IF unit Maps service signals to microwave frame signals and
demaps microwave frame signals to service signals
Performs conversion between microwave frame signals and
IF analog signals
Provides the O&M channel between the IDU and the
ODU.Supports FEC
Control unit System communications and control.
System configuration and management.
Collects alarms and monitors performance.
Cross-connects overheads.
Clock unit Traces the clock source signal and provides various clock
signals for the system.
Supports input and output of one external clock signal.
Auxiliary interface unit Provides the orderwire interface.
Provides the synchronous/asynchronous data interface.
Provides the external alarm input/output interface.
Power unit Accesses –48 V/–60 V DC power.
Provides DC power for the IDU.
Provides –48 V DC power for the ODU.
Fan unit Provides wind cooling for the IDU
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The IDU 910 is the indoor unit of the OptiX RTN 910.
The IDU 910 adopts the card plug-in design. It can implement different functions by
configuring different types of boards. All the service boards support hot-swapping.
The EXT represents an extended slot, which can be inserted with various IF boards
and interface boards.
Slot 1 is the TDM/Hybrid control, switching, and timing board, CSTA is the
TDM/Hybrid control, switching, and timing board, and CSHA/CSHB/CSHC are Hybrid
control, switching, and timing board.
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There are 3 groups of the paired slots, slot 1 and slot 2, slot 3 and slot5, slot 4 and
slot 6. The paired slots are used in the 1+1 FD or 1+1 SD configuration.
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The IF board receives and transmits 1x IF signal. It realizes the conversion between
baseband digital signal and IF signal, it also provides -48V DC power supply and
management signal to the ODU.
The ODU is not inserted in a physical slot but has a logical slot on the NMS. The
logical slot number of the ODU is the logical slot number of the IF board that is
connected to the ODU plus 20.
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The ODU-PWR switch is equipped with a lockup device. To turn on or turn off the
switch, you need to first pull the switch lever outwards slightly. When the switch is set
to "O", it indicates that the circuit is open. When the switch is set to "I", it indicates that
the circuit is closed.
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The ODU is not inserted in a physical slot but has a logical slot on the NMS. The
logical slot number of the ODU is the logical slot number of the IF board that is
connected to the ODU plus 20.
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The ODU-PWR switch is equipped with a lockup device. To turn on or turn off the
switch, you need to first pull the switch lever outwards slightly. When the switch is set
to "O", it indicates that the circuit is open. When the switch is set to "I", it indicates that
the circuit is closed.
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The ODU is not inserted in a physical slot but has a logical slot on the NMS. The
logical slot number of the ODU is the logical slot number of the IF board that is
connected to the ODU plus 20.
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The ODU-PWR switch is equipped with a lockup device. To turn on or turn off the
switch, you need to first pull the switch lever outwards slightly. When the switch is set
to "O", it indicates that the circuit is open. When the switch is set to "I", it indicates that
the circuit is closed.
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The channel spacing 13.75 MHz and 27.5 MHz are applied to the 18 GHz frequency
band.
The channel spacings listed in the table are the minimum channel spacings supported
by the product. The channel spacings larger than the values are also supported.
The SDH/PDH radio link of the OptiX RTN 950 supports all microwave modulation
mode. If the SDH/PDH radio link supports the 4E1/16QAM microwave modulation
mode, it cannot use the high power ODU.
The OptiX RTN 910 whose equipment is in the form of PDH microwave equipment
supports the first six microwave modulation mode.
The OptiX RTN 910 whose equipment is in the form of SDH microwave equipment
supports all microwave modulation mode. If the OptiX RTN 910 supports the
4E1/16QAM microwave modulation mode, it cannot use the high power ODU.
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The channel spacings 13.75 MHz, 27.5 MHz, and 55 MHz are applied to the 18 GHz
frequency band.
The channel spacings listed in the table are the minimum channel spacings supported
by the product. The channel spacings larger than the values are also supported.
E1 services need to occupy the corresponding bandwidth of the service capacity. The
bandwidth remaining after the E1 service capacity is subtracted from the service
capacity can be provided for Ethernet services.
The OptiX RTN 910/950 whose equipment is in the form of hybrid microwave
equipment supports all microwave modulation mode. If the OptiX RTN 910 supports
the 56 MHz microwave modulation mode, it must use the high power ODU.
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Optical interfaces description:
TX1 Transmit port of the first STM-1 optical interface
RX1 Receive port of the first STM-1 optical interface
TX2 Transmit port of the second STM-1 optical interface
RX2 Receive port of the second STM-1 optical interface
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In the case of the OptiX RTN 950/910, only the ports 1-16 and 22-37 of the SP3D
interface are used. Ports 1-16correspond to E1 signals 1-16 and ports 22-37
correspond to E1 signals 17-32.
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The Ethernet interface board can realize the following functions when working with
the packet switching board:
Supports port-based, port+VLAN-based, and port+QinQ E-Line services.
Supports 802.1d bridge-based, 802.1q bridge-based, and 802.1ad bridge-
based E-LAN services.
The Ethernet boards can process 1518 bytes to 9600 bytes frame length.
Supports the link aggregation group (LAG) function.
Supports the Ethernet ring protection switching (ERPS).
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The EM6T provides two GE electrical interfaces whereas the EM6F uses the SFP
optical modules to provide two GE optical or electrical interfaces. The GE electrical
interfaces are compatible with the FE electrical interfaces.
Description of the interfaces
FE1/2/3/4, FE interface, RJ-45
GE1/2 ,GE electrical interface (EM6T),RJ-45
GE1/2 ,GE optical interface (EM6F) ,LC (SFP optical module)
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The LINK1 and LINK2 indicators are available only on the EM6F and indicate the
states of the corresponding GE optical interfaces
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Functions of CSTA
Provides full timeslot cross-connections for VC-12/VC-3/VC-4 services
equivalent to 8x8 VC-4s.
Performs system communication and control.
Provides the clock processing function and supports one external clock
input/output function.
Provides 16 75-ohm or 120-ohm E1 interfaces.
Uses the SFP module to provide two STM-1 optical or electrical interfaces.
Provides one Ethernet NM interface, one NM serial interface, and one NE
cascading interface.
Provides one orderwire phone interface, one asynchronous data interface, and
three-input and one-output external alarm.
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Functions of CSHA:
Provides full timeslot cross-connections for VC-12/VC-3/VC-4 services
equivalent to 8x8 VC-4s.
Provides the 4.2 Gbit/s packet switching capability.
Performs system communication and control.
Provides 16 75-ohm or 120-ohm E1 interfaces.
Provides two FE electrical interfaces.
Provides two GE electrical interfaces that are compatible with the FE electrical
interface.
Provides one Ethernet NM interface, one NM serial interface, and one NE
cascading interface.
Provides one orderwire phone interface, one asynchronous data interface, and
three-input and one-output external alarm interfaces.
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Functions of CSHB:
Provides full timeslot cross-connections for VC-12/VC-3/VC-4 services
equivalent to 8x8 VC-4s.
Provides the 4.2 Gbit/s packet switching capability.
Performs system communication and control.
Provides 32 75-ohm or 120-ohm E1 interfaces.
Provides two FE electrical interfaces.
Provides two GE electrical interfaces that are compatible with the FE electrical
interface.
Provides one Ethernet NM interface, one NM serial interface, and one NE
cascading interface.
Provides one orderwire phone interface, one asynchronous data interface, and
three-input and one-output external alarm interfaces.
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Functions of CSHC:
Provides full timeslot cross-connections for VC-12/VC-3/VC-4 services
equivalent to 8x8 VC-4s.
Provides the 4.2 Gbit/s packet switching capability.
Performs system communication and control.
Provides 16 75-ohm or 120-ohm E1 interfaces.
Uses the SFP module to provide two STM-1 optical interfaces.
Provides two FE electrical interfaces.
Uses the SFP module to provide two GE optical or electrical interfaces that are
compatible with the FE electrical interface.
Provides one Ethernet NM interface, one NM serial interface, and one NE
cascading interface.
Provides one orderwire phone interface, one asynchronous data interface, and
three-input and one-output external alarm interfaces.
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Auxiliary Interfaces and Management Interfaces
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The CSHA/CSHB/CSHC is the integrated Hybrid system control and communication,
switching, and clock board. The differences between the CSHA, CSHB, and CSHC
are with regard to the types and number of service interfaces.
Auxiliary Interfaces and Management Interfaces
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All the auxiliary Interfaces (orderwire, clock inputting, external alarm interfaces etc.)
are integrated on the system control, switching and timing board in IDU 910.But there
is a independent AUX board that provides auxiliary Interfaces in IDU 950.
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Description of the auxiliary interfaces and management interfaces on the CST/CSH
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The ESD wrist strap needs to be connected to the ESD wrist strap jack to realize the
proper grounding of the human body.
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What types of the services can be supported by OptiX RTN 910 and OptiX RTN 950?
What are the corresponding boards used for them?
E1: SP3D and SP3S
FE/GE: EM6F and EM6T
What’s the use of the paired slots in IDU 910 and IDU 950 ?
For the 1+1 FD or 1+1 SD configuration.
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By the types of the antenna interface on ODU, ODU can be classified into waveguide
interface ODU and coaxial interface ODU. Usually 7GHz to 38GHz ODU is
waveguide interface and 6GHz SP serial ODU is coaxial interface.
The waveguide interface ODU can be installed by direct mount.
The typical waveguide interface ODU is 260 mm long, 260 mm wide, and 92 mm high.
Its weight is not more than 5 kg and its power consumption is not more than 40 W.
The following introduces the ODU interfaces. At the bottom of the ODU, there is a
round interface – antenna port. The OptiX RTN 910/950 equipments are installed
through direct covering. Thus, through the antenna interface, the ODU is directly
connected to the antenna back or the hybrid coupler. The ODU has the grounding
double-screw bolt, RSSI test interface, and an IF interface. The RSSI test interface
connects to the multi-meter for testing and receiving the signal intensity. The IF
interface connects to the IF cable, exchanges the IF signal and ODU management
signal at on the IDU IF board, and receives the DC feed current.
RSSI is the receive signal strength interface used for testing the ODU receiving power.
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P-90
Usually, it is used in separated mount, and RF cable is necessary.
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In the OptiX RTN 910/950, the hybrid coupler combines and splits the RF signals, that
is, combines two ODU RF signals into one RF signal in the transmission direction,
and sends the signal to the antenna. In the receiving direction, the hybrid coupler
splits the RF signal received by the antenna into two RF signals, and then sends the
signals to the ODU. As shown in this figure, the waveguide cavity of the hybrid
coupler provides three ports: antenna port (also called common port), primary
tributary port and secondary tributary port. The RF signals received by the primary
tributary port and secondary tributary port are integrated into one RF signal at the
waveguide cavity, and the signal is output from the antenna port. The RF signal
received by the antenna port is split into two FR signals at the waveguide, and then
the signals are output from the two tributary ports.
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The primary branch interface or secondary branch interface of a hybrid coupler that
has coaxial interfaces is connected to ODUs through an RF cable.
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Loss is the loss between primary branch to the antenna interface.
Coupling is the loss between secondary branch to the antenna interface.
VSWR stands for the voltage standing wave ratio.
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It is mainly protect the hardware of ODU and IF unit.
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In case of active IF board or active ODU failed, the standby ODU will be unmute
immediately, and cross-connection unit will also switch to the standby IF board for
receiving the signal simultaneously.
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Because of the multi-path fading, the 1+1 SD installing the main and standby
antennas in different positions to protect the transmission microwave channel.
The active and standby IF boards must be in the paired slots.
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In case of microwave signal degrade in main antenna for the multi-fading reason, the
active IF board can switch to the signal from standby IF board via the data bus
between the paired slots.
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The 1+1 FD uses the fading feature diversities between the signals of different
frequencies in the space transmission to protect the active and standby channels in
the microwave transmission..
The active and standby IF boards must be in the paired slots.
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In case of microwave signal on frequency f1 is degrade for the frequency selective
fading reason, the active IF board can switch to the signal from standby IF board via
the data bus between the paired slots.
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ERPS is applicable to ring physical networks and can provide protection for the E-
LAN servicesbetween all the nodes on the ring network. Generally, when a ring
network is configured withERPS, the main node blocks the ports on one side so that
all the services are transmitted throughthe ports on the other side. In this manner,
service loops are prevented. If a section of link failsor an NE becomes faulty, the main
node unblocks its blocked port so that the services are switched from the faulty point
to this port for transmission. In this manner, protection for thering network is realized.
The Ethernet ring network shown in slide is configured with ERPS. Generally, the
main node (NE D) blocks its port that is connected to NE A, and all the services are
transmitted over the link NE A - NE B - NE C - NE D. When the link between NE A
and NE B becomes faulty,NE D unblocks the blocked port so that the services can be
transmitted over the link NE A - NED - NE C - NE B.
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The OptiX RTN 910/950 supports only the MSTP protocol that uses the common and
internal spanning tree (CIST). The MSTP that uses the CIST can be used as a rapid
spanning tree protocol (RSTP). The RSTP is applicable in the case of a network loop.
This protocol adopts certain algorithms to reconstruct a loop network into a loop-free
tree network and thus prevents Ethernet frames from increasing and cycling in an
endless manner on the loop network. In the case of the OptiX RTN 910/950, the
MSTP is used to prevent a network loop on the access side.
When the user equipment accesses the OptiX RTN 950 through two different trails,
you can configure the ports on the OptiX RTN 950 that are connected to the user
network into a port group. This port group, together with the switch on the user
network, can run the MSTP. Hence, if an service access link becomes faulty, the
MSTP enables a re-configuration togenerate the spanning tree topology, thus
providing protection for the user network that is configured with multiple access points.
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The 1+1 HSB and 1+1 SD or FD can be exist together?
When the 1+1 FD or SD is configured, the HSB is enable automatically and
when the hardware failure take place, it will be trigged.
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When the OptiX RTN 910 whose equipment form is the SDH or PDH microwave
equipment forms the ring network protection, the SNCP is used to protect SDH/PDH
services.
When the OptiX RTN 910 whose equipment form is the hybrid microwave equipment
forms the ring network protection, the SNCP is used to protect E1 services and the
ERPS is used to protect Ethernet services.
When the OptiX RTN 910 whose equipment form is the SDH microwave equipment,
and the optical transmission equipment form a hybrid ring network, the SNCP is used
to protect STM-1 services on the ring network.
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When the SDH/PDH radio link forms the ring network protection, the SNCP is used to
protect SDH/PDH services.
When the hybrid radio link forms the ring network protection, the SNCP is used to
protect E1 services and the ERPS is used to protect Ethernet services.
When the SDH radio link and the optical STM-1 path form a hybrid ring network, the
SNCP is used to protect STM-1 services on the ring network.
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