When the ODUK SPRING Protection Switching Is Performed by Running External Commands, If the OTN Tributary Board Is Not in Position, the Switching May Fail

Issue Description

When the ODUK SPRING protection switching is performed by running external commands, if the OTN Tributary board is not in position, the switching may fail. 

Alarm Information

Null 

Handling Process

If the OTN board for the westward or eastward services of the ODUK SPRING protection is not in position, performing the switching by running external commands is nonsense. If you really intend to perform the switching by running external commands, you must ensure that the OTN board for services in that direction is in position.  

Root Cause

In the network shown in the following figure, NE6 is the management node, and services are 
configured between NE2 and NE6. In addition, the OTN board of NE2 is not in position. 

Under normal conditions, the service flow, indicated by the red real line, is as shown in the figure. When NE6 starts a westward forced switching, NE2 switches from the IDLE page to the eastward switching page. The service flow, indicated by the blue dashed line, is as shown in the figure.
In the process of the switching, if the tributary board of NE2 is in position, the Huawei OTN signal on the protection link is stable and there are no abnormal alarms on the protection channel. But if the tributary board of NE2 is not in position, the OTN signal on the protection link needs to be regenerated by an NS2(OTN board according to certain Recommendations). The regeneration operation requires a certain period of time. The protection channel may detect abnormal alarms before the OTN signal regeneration is completed and immediately reports an SF alarm, which results in the failure of the forced switching.

Suggestions

Null 

What is the System Architecture of Huawei OTN OSN8800?

The OptiX OSN 8800 system uses the L0 + L1 + L2 architecture. Ethernet/MPLS-TP switching is implemented on Layer 2, ODUk/VC switching on Layer 1, and wavelength switching on Layer 0.

System architecture of the OptiX OSN 8800 (MS-OTN) 

System architecture of the OptiX OSN 8800 (OCS) ]

Functions of modules are as follows:

• Optical-layer boards are classified into optical multiplexer and demultiplexer boards, optical add/drop multiplexing (OADM) boards, optical amplifier (OA) boards, optical supervisory channel (OSC) boards, optical spectrum analysis boards, optical variable attenuator boards, and optical power and dispersion equalization boards. These boards are intended to process optical-layer services, for example, to cross-connect wavelengths at the optical layer.
• Electrical-layer boards such as OTU, tributary, and line boards like 40G TN54NS3 are used to process electrical-layer signals, and perform conversion between optical and electrical signals. The OptiX OSN 8800 uses a tributary-line-separate architecture, and a centralized cross-connect unit to flexibly groom electrical-layer signals at different granularities.
• For OptiX OSN 8800, an universal line board is used to process electrical-layer signals and perform conversion between optical and electrical signals. In addition, an universal line board can work with a centralized cross-connect board to achieve hybrid transmission and fine-grained grooming of OTN, SDH, and packet services.
• For OptiX OSN 8800, EoO, EoW, Ethernet over SDH (EoS), and packet boards have L2 processing capabilities. They can add, strip, and exchange MPLS or VLAN tags, learn MAC addresses, and forward packets. Only packet boards can add, strip, or exchange MPLS tags.
• As the control center of the entire system, the system control and communication (TN52SCC) board cooperates with the network management system (NMS) to manage boards in the system and to implement inter-subrack communication.
• The clock board provides system clock signals and frame header signals to each service board, and synchronizes the local system time with the upstream system time, achieving clock and time synchronization.
• The power supply and fan systems with a redundancy protection design ensure highly-reliable equipment operation.
• The auxiliary interface board provides functional ports such as clock/time input/output ports, management serial port, alarm output and cascading ports, and alarm input/output ports.
• Inter-board communication and service cross-connections, clock synchronization, and power supplies are implemented using the backplane buses. Backplane buses include control and communication buses, clock buses, and power buses.

What is the Service Mapping of Huawei OSN8800 Equipment?

Mapping Client Services into ODUk Signals

This section describes how the OptiX OSN 8800 maps services into ODUk signals. WDM equipment uses standard mapping procedures or timeslots to map signals into ODUk signals.

• When using the standard mapping procedures, Huawei OptiX OSN 8800 directly maps signals into ODUk signals and supports flexible grooming of services.
• When using timeslots, the WDM equipment can aggregate multiple services at rates lower than 1.25 Gbit/s into one ODU0 signal, or multiple services at rates lower than 2.5 Gbit/s into one ODU1 signal. This function enables multiple services to share the same ODU0 or ODU1 bandwidth.

Mapping Client Services Using Standard Mapping Procedures

The OptiX OSN 8800 can map client services without using timeslots. It can use standard mapping procedures to map client services directly into ODUk signals, as shown in Figure 1.

Figure 1 Mapping client services into ODUk 

Mapping Client Services Using Timeslots

The OptiX OSN 8800 divides an ODUk (k = 0, 1) signal into several timeslots, each with a bandwidth of 155 Mbit/s. It slices client services into 155 Mbit/s signal segments, each mapped into ODUk signals. The OptiX OSN 8800 can map multiple low-rate client services into one ODUk (k = 0, 1) signal, thereby improving bandwidth utilization.

The services that can be mapped into one ODU0 by OptiX OSN 8800 using timeslots include the following: FE, FDDI, ESCON, SDI, DVB-ASI, FC100, and FICON. Figure 2 shows how FE/FDDI and ESCON/SDI/DVB-ASI services are aggregated into one ODU0.

Figure 2 Aggregating client services into one ODU0 

The services that can be mapped into one ODU1 by the OptiX OSN 8800 using timeslots include the following: FE, FDDI, STM-1, OC-3, ESCON, SDI, DVB-ASI, STM-4, OC-12, FC100, FICON, GE, HD-SDI, FC200, and FICON Express.Figure 3 shows how GE, STM-1/OC-3, and FC100 services are aggregated into one ODU1.

Figure 3 Aggregating client services into one ODU1 

Multiplexing and Mapping ODUk Signals into OTUk Signals

This section describes the structure that the OptiX OSN 8800 uses to multiplex board TN12M4001

 and map ODUk signals into OTUk signals. After the E/O conversion, the signals are sent to the WDM side.

The OptiX OSN 8800 can multiplex and map client signals into ODUk (k= 0, 1, 2, 2e, 3, 3e, 4, flex) signals and produce OTUk (k=1, 2, 2e, 3, 3e, 4) signals on the WDM side for line transmission. Figure 1 shows the ODUk multiplexing and mapping structure that the OptiX OSN 8800 supports.

Figure 1 Multiplexing and mapping ODUk signals into OTUk signals (OptiX OSN 8800) 

U2000WebLCT start normally but it does not login

Issue Description

It is necessary to do some test on a Huawei RTN620. It use the U2000WebLCTV100R005C00SPC400. The U2000WebLCT start normally, you enter the admin and password and when you try to login (click login) the windows closed itself.

Alarm Information
None

Handling Process
Copy the address which appear on the Internet Explorer when the U2000WebLCT is started (http://localhost:13002/weblct/page/login.html) and then open other internet navigator (like Mozilla Google chrome) and copy this address on this navigator. Then enter the U2000WebLCT user and password in this new page and you can login.

Root Cause
The U2000WebLCT use the internet navigator like an interface. It open in the internet navigator the laptop as configured that main internet navigator. In this case the U2000 WebLCT is open on a Internet Explorer 8. Its seem that U2000WebLCT does not support Internet Explorer 8.

Suggestions
Open the U2000WebLCT with Mozilla or Google Chrome interner navigator.

The most popular Huawei S2700EI switch as below:

LS-S2700-9TP-SI-AC

LS-S2700-9TP-PWR-EI

LS-S2700-18TP-SI-AC

LS-S2751-28TP-PWR-EI-AC

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Email: Sales@Thunder-Link.com

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Website: http://www.thunder-link.com

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Huawei Launches the World’s First Fully Outdoor WDM Product

Carrying LTE/LTE-A CPRI services and helping to drive down network costs, making baseband unit cloud a reality
Huawei released the world’s first fully outdoor Wavelength-division multiplexing (WDM) product at a TDC and Huawei joint global WDM/OTN seminar themed ‘Simplified Network for a Better Experience’. Used for carrying LTE/LTE-A common public radio interface (CPRI) services, the product helps drive down the costs of network deployment and operations and maintenance, realizing the baseband unit cloud (BBU Cloud).
In order to reduce site leasing fees and centrally manage base station resources, carriers are beginning to adopt the BBU Cloud as the mainstream networking mode. To date, the baseband units (BBUs) have been collectively deployed in the integrated central office, and remote radio units deployed at the coverage points. The BBUs then work with the remote radio units through CPRIs to extend the service transmission distance. Usually, the CPRI services are transmitted through connected optical fibers. This type of networking mode consumes optical fiber resources and has low reliability. In addition, there are no supervisory measures for managing fibers, making maintenance difficult.
The fully outdoor Huawei WDM product replaces optical fiber connections with WDM technology. This results in a pair of optical fibers able to withstand more than 100 pairs of CPRI services. Also, the Huawei product reduces network investment and shortens service deployment time, providing a highly reliable network by using a unique delay compensation technology. The product also supports remote performance monitoring and uses a network management system to precisely locate faults. To ensure it is suitable for outdoor use it has a compatible design, supporting 614 Mbit/s to 9.8 Gbit/s (CPRI1-CPRI7) service on the client side. This specific design provides a product suitable for covering high-density and large-capacity metropolitan areas.
Huawei WDM/OTN series end-to-end intelligent optical transport platforms are applicable to the backbone core layer, metropolitan core layer, metropolitan aggregation layer, and metropolitan edge access layer. Thunder-link.com wholesales Huawei WDM products, include Huawei OSN 6800, Huawei OSN 8800. Get the best price Huawei WDM products from Thunder-link.com, ships to worldwide.
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It’s referenced from:
http://pr.huawei.com/en/news/hw-427431-cpri.htm#.VUw29iKUcUg