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21 BSS21515 Ethernet OAM Support

21 BSS21515 Ethernet OAM Support

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Flexi EDGE BTS Feature Descriptions



ated. The loopback mechanism is used only for testing as regular traffic is interrupted in

this case. Link Layer Ethernet OAM is also used to monitor the link between two BTSs

in a chain.

Service Layer Ethernet OAM

Service layer OAM is implemented only in the BTS. Service Layer Ethernet OAM

handles the end-to-end Ethernet connectivity and service guarantees. Service Layer

Ethernet OAM functionality is implemented in a sublayer between an upper layer (MAC

client) and a lower layer (MAC or optional MAC Control sublayer). BSC checks the

license while enabling this feature and deliver Service Layer parameters and alarms

between the NetAct and the BTS. At BTS end, the feature is enabled through Element

Manager (EM) and the licence is checked after BTS_CONF_DATA is sent.

Ethernet OAM procedures supported are:

















Ethernet Continuity Check (ETH-CC), for detecting loss of continuity between two

Maintenance association End Points (MEPs) within a MD or to detect unintended

connectivity.

Ethernet Loopback (ETH-LB), for verifying connectivity of a MA End Point (MEP)

with a MA Intermediate Point (MIP) or a peer MEP.

Ethernet Link Trace (ETH-LT), for tracking the path (hop-by-hop) to a destination

MEP.

Ethernet Alarm Indication Signal (ETH-AIS), for suppressing alarms following detection of defect conditions.

ETH Remote Defect Indication (ETH-RDI), for communicating the defect condition

detected by a MEP with its peers.

Ethernet Loss Measurement (ETH-LM), for maintaining a count of transmitted and

received data frames between a pair of MEPs.



BTS

BSC



Eth

UNI



BTS



UNI



GbE

if



Ethernet

UNI



Eth



GbE

if

UNI



BTS



UNI



Eth



Subscriber

Operator



Node to node



Figure 41



g



DN70124104



Service Layer Ethernet OAM



Triangles represent MEPs and circles represent MIPs.

Service Layer Ethernet OAM is used for end-to-end service monitoring and fault management application. Service Layer Ethernet OAM is used to monitor the networks of

different service providers and the backhaul network as a whole. The Operator config-



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Flexi EDGE BTS Feature Descriptions



ures Service Layer Ethernet OAM end to end from the two BTSs to the BSC site device.

The protocol is run node to node from one BTS to the another in the chain.

Benefits













It allows the operators to reduce OPEX by minimizing the effort for maintaining an

Ethernet based backhaul network.

It provides easy detection, verification and localization of faults in an end-to-end

(Metro) Ethernet network and Ethernet link (first mile).

It provides remote fault management and connectivity test thereby, reducing site

visits.

It provides verification of (metro) Ethernet service’s SLA requirements across an

entire network even with different service providers.

It saves cost for the external equipment as it is an in-built functionality in BTS/BSC.



Requirements









180



BSC S16 or later

Flexi EDGE BTS EX5

NetAct OSS5.4 CD Set 2 or later



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Flexi EDGE BTS Feature Descriptions



Appendix Other features



9 Appendix Other features

9.1



Other features

Flexi EDGE BTS also supports the following feature enhancements made in UltraSite

EDGE BTS:

















DN70124104



Enhanced Automatic Frequency Correction (E-AFC)

BSS10022 Frame Erasure Rate (FER) Measurement

BSS9064 Real Time Update to BTS

BSS7048 CCCH Improvements

BSS6074 Active Channel Interference Estimation

BSS5072 Better Random Access Channel Detection

BTS2041 BTS Local Blocking



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9.2



RG602198: Online Intermodulation Measurement Functionality

This feature enables tests of RF path during low traffic periods.This feature enables

tests of RF path during low traffic periods. Intermodulation (IM) products could be in the

range of -70 to -90 dB and IM in antenna RF path can cause a performance degradation

of 20~40dB. Remotely, it is possible to find IM problems in those sites configured with

certain frequency groups. In order to detect all IM-unqualified antennas, tuning frequencies of each cell to produce IM product is an easy and effective approach. This requires

dummy burst transmit in idle timeslot/carrier to ensure the enough antenna output power

and hence the IM product is detectable.

Benefits for the Customer

Reduces travel costs and onsite working costs. Be able to remotely find out the IM problematic (IMP) site instead of performing onsite check with PIM tester.

Before you start

Prepare BTS for testing. Configuration has 2-way or 4-way combining for at least three

TRXs in the sector.

Following should be done using MML commands.







Sector should be made non-hopping

Adjust frequencies

Example

TX1 = 1810 MHz (BCCH)

TX2 = 1840 MHz, RX3 = 1780 MHz, thus creating order 3 IMP



Figure 42



Cabling details



In the above figure, EM screen shot gives cabling information.

Steps

The following steps should be taken to check the IM problematic site:



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Flexi EDGE BTS Feature Descriptions



1



In TRX Continuous Transmission tab, select the TRX from the drop down menu.

In this case, select TRX2.



g



To test Antenna 1, transmission from TR1 and TRX2 are needed, receive on TRX3. TRX

1 is BCCH TRX, so it is transmitting continuously.



Figure 43

2



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DN70124104



TRX continuous transmission



Click Start.

This continuous transmission has a limited duration. Once timer expires, the user is notified.



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