Technical Report on Switch Operations

Table of ContentsIntroduction3AXE Node3APZ (goto alex type CSPB in bsc)3APG 404APT4RAN architecture4Transcoder Controller5Base Station Controller5Interfaces5Air Interface5Abis Interface5A-ter interface6A interface6PCM Link Devices6Mobile Soft Switch Solution8Layered Architecture8Classic MSC solution8Mobile Switch Center8Media Gate Way9IP signaling9Interfaces9Nb interface9lu Interface10Mb Interface10Node Element manager10Signaling10Signaling Link11Signaling Point11Protocol stack of SS711

Introduction The report gives the summary of the GSM and WCDMA. The main concern of the report is to fully describe the operations, maintenance and configuration of the following network elements, BSC, TRC, MSC, MGW and GPRS.

AXE NodeThe AXE telephone exchange is a line of products of circuit switched digital telephone exchanges. AXE system has a dual processor system, both of which run together so that even if one of them fails there is no disruption of services. The system handles all kinds of landline and mobile telephone networks like GSM, WCDMA and international telephony traffic. In the AXE system the computer control system is called APZ. AXE is divided into these two parts APZ and APT.

APZ The function of the APZ is to provide the real time processing capacity required by the communications applications. The man machine communication between operational personnel and the AXE system is also handled by the APZ. The APZ consists of several subsystems such as:Central Processor (CP) which is used for controlling most of the activities in the node. For instance, size alteration of data functions, program correction or modification of the program code in software units loaded in APZ, measurement of processor loads and handling of system backups. The call setup procedure is one of the main tasks controlled by the CP.Regional Processor it is responsible for controlling all the hardware located in the APT switching part of AXE. It sometimes offloads the CP with simple routine tasks and administrative operations.Input Output System there are 2 types of I/O systems in AXE called the APG40 and IOG20. The main task of the I/O system is to connect the user to the AXE. APG40 supports protocols for external interfaces such as TCP/IP, Telnet for remote login, FTP for file transfer and RPC for message transfer. APG40 is also used for storing backups, statistics and log files.APTIs used in AXE as the switching part, for instance APT provides the switching functions needed to implement a PSTN local exchange or node. APT is implemented both in software and hardware. APT is divided into subsystems called Group Switching Subsystems (GSS). GSS is used for connection or disconnection of traffic and signal path through the Group Switch (GS). GSS is also used for supervision of the hardware in subsystems by continuous parity check, supervision of digital links connected to the switch and monitoring stable clock frequency of the system.Group Switch SubsystemsGroup Switch (GS) is used for storing connection information. It connects an incoming channel to an outgoing channel. For instance it can connect incoming PCM timeslots to any outgoing PCM link. GS is made up of Time Switch Module and Space Module .Time Switch Module (TSM) used for switching connection and release of speech path. TSM also have counter s used in statistics of traffic measurement. Network Synchronization used for synchronization of the network.Group Switch Board Names (GSBOARD) used for translation of fault cases.Clock Pulse Generation and Timing (CLT) it is a three clock module that supply TSM and Space Modules (SPM) with clock pulse.GSM1 and GSM2 these blocks help the TSM with maintenance functions regarding TSM and SPM. They contain administrative functions for all Switching Network Terminals (SNT) connected to the switch.

Radio Access Network ArchitectureAll radio related functions are concentrated in Radio Access Network. It is responsible for establishing and maintaining a connection between Mobile Stations. Besides that it also allocates radio channels for voice and data messages. RAN consists of three nodes, Transcoder Controller, Base Station Controller and Radio Base Station. Transcoder Controller Transcoder Controller (TRC) is a network element that serves as the transmission link between the MSC and the BSC. TRC reduces the bit rate from 64kbps to 16kbps by multiplexing four channels of 64kb/s into one channel. Transcoder node contains pooled transcoder resources which are Full Rate, Half Rate and Enhance Full Rate. TRC can be integrated with the BSC and the node is called TRC/BSC or it can stand on its own and it is called Stand-Alone TRC. Stand Alone TRC is connected to the MSC via the A interface and it is connected to the BSC via the A-ter interface. Base Station ControllerBase Station Controller (BSC) is a network element that manages all radio related functions of a GSM network such as handling allocation of radio channels, frequency administration, power and signal measurement from the Mobile Station (MS), and handover from one BTS to another. BSC also manages or controls Base Transceiver Station (BTS). BSC works as a transmission link between the BTS and the Mobile Switch Center (MSC). BSC have two interfaces called Abis interface and A interface. Abis Interface is the interface that connects the BSC and the BTS. A interface is the interface that connects the the BSC to the MSC.InterfacesIn Radio Access Network there are four kinds of interface and they are Air interface, Abis interface, A-ter interface and A interface. There are basically two methods of building interfaces. 2Mbs PCM (E1) interface it is a physical channel that is divided into 32 timeslots, each having a bit rate of 64Kbps. 2Mbs PCM (T1) interface which is a physical channel that is divided into 24 timeslots, each having a bit rate of 64Kbps.Air InterfaceThis interface operates between the BTS and the MS. It uses the Time Division Multiple Access (TDMA) to transmit and receive traffic and signaling information. The TDMA technique is used to divide each carrier into eight timeslots. These timeslots are then assigned to specific users, allowing up to eight conversations to be handled simultaneously by the same carrier.Abis InterfaceThis interface is responsible for transmitting traffic and signaling information between the BTS and BSC. The transmission protocol used for sending signaling information on the A-bis interface is called Link Access Protocol on the D channel (LAPD) and there is 3 different protocol formats that can be used to carry traffic on the A-bis interface: LAPD Unconcentrated LAPD Concentrated LAPD MultiplexingIn LAPD Unconcentraed, the channel used for signaling of 64Kbps is transmitted first and then it is accompanied by two 64Kbps channels each carrying four 16Kbps sub-multiplexed voice or data channels.A-ter interfaceA-ter interface is the link between the TRC and the BSC. In the TRC speech is transcoded from 64Kbps to 16Kbps whereby 13Kbps is used for traffic and 3Kbps is used for signaling.A interface This interface provides with traffic information and signaling between the RAN (BSC or TRC/BSC) and the MSC. Speech is transcoded in the TRC, and the SS7 signaling is transparently connected through the TRC or on a separate link to the BSC.PCM Link DevicesExchange Terminal Circuit (ETC) it is a common hardware in AXE to handle the Pulse Code Modulation (PCM) transmission links between the BSC and the MSC also between the BTS and the BSC. The difference between the ETC boards used between MSC and TRC/BSC, and TRC/BSC and RBS is that they have different software uploads. The figure below shows the PCM Link types.

ETCs in the MSC, TRC, and BSC (or TRC/BSC) use the same type of hardware since they are all based on the same type of platform (AXE) but they are loaded with different types of software. MSC A interface Line Terminal (MALT) is the name of the ETC in the MSC that goes towards the TRC or TRC/BSC. Radio Transmission and Transport Subsystem (RTS) A interface Line Terminal (RALT) is the name of the ETC in the TRC or TRC/BSC that goes towards the MSC. RTS A-Bis interface Line Terminal (RBLT) is the name of the ETC in the BSC or TRC/BSC that goes towards the RBSs. RTS A-Ter Line Terminal TRC (RTLTT) is the name of the ETC in the stand-alone TRC (or TRC/BSC) that goes towards a stand-alone BSC. RTS A-Ter Line Terminal BSC (RTLTB) is the name of the ETC in the stand-alone BSC that goes towards the stand-alone TRC (or TRC/BSC). RALT and RBLTEach timeslot or device, which is 64 kbps, on the PCM link towards the MSC is called a RALT device. The device is a resource that the BSC can store information on. In this case, it is either signaling or speech towards the MSC. Timeslots or devices on the PCM link towards the RBS are called RBLT devices. In the case of the RBLT, stored BSC information is either LAPD signaling or speech towards the RBS. The number of RBLT devices is 32 on an E1 PCM link and 24 on a T1 PCM link.

Switching Network TerminalSwitching Network terminal (SNT) refers to all the equipment that is connected to the GS using the standardizes interface and SNTP is the point where the SNT is connected to the CS. The function of the SNT is to supervise the DIPs connected to tha GS.

Digital Path Digital Path (DIP) is the name of the function used for supervision of the connected PCM lines between the nodes. For instance the DIP between the TRC/BSC is called RALT while the DIP between the TRC/BSC is called RBLT.SUBRATE SWITCH Subrate Switch (SRS) allows connections of lower than 64Kbps. SRS can switch down to 8Kbps and it can then put different 16Kbps devices on the same 64Kbps channel. When pooled transcoders which have the following resources Half Rate, Full Rate and Enhanced Full Rate integrated in the same 64kps channel is used, SRS is need because the GS cannot switch lower than 64kbps.

Health check of BSCThe health check is done two times every day in the morning and in the afternoon. The purpose of the health check is to check the status and alarms of the network. The excel sheet below shows the report of the health check.

The report shows the processor load of the Central Processor in each node, the CP utilization, types of alarms on each node if any and the route utilization. BSC Daily routines commands a) ALLIP The commands print the entire alarm list in APT and in APZ.b) DPWSP Check the status of the CPc) Prcstate, CLUSTER NODE, and ALIST these commands are used to look at the status and alarms in AP.d) GDSTP Check the status of the Group Switche) DTSTP:dip =all prints the state of all the defined digital paths.f) EXEMP:EM=ALL,RP=ALL prints the state of the External Modules and Regional Processor.g) NSSTP, and CACLP the commands print the state of all connected clock reference and the system time respectively.h) DBTSP :TAB=SAACTIONS used to check the pending size alterations.i) DTQSR used to clean all the digital paths.j) RLCRP:CELL=ALL prints all the cell resources.k) RXASP:MOTY=RXOTG and RXASP:MOTY=RXETG prints the state of the managed objects.

Mobile Soft Switch SolutionEricsson introduced layered architecture which is a technique that separates systems or network components in layers so that changes can be made in one layer without affecting the other layers. Soft switch separates the call control and switching functions into separate nodes.Layered ArchitectureThe layered architecture uses IP backbone technology and it is made up of two layers.A) Control layer provides centralized location of servers which helps in reducing Operation and maintenance costs. It also allows independent of transport technology. In this layer resides MSC-severs which are the ones that handles call control.B) Connectivity layer allows for free choice of transmission technology, enables transport of coded voices and distributed MGWs enables transmission and interconnection charges savings. In this layer resides MGW which handles switching of calls.

Classic MSC solutionIt is not made up of layers. It is a monolithic architecture which has the MSC used for both control and switching of calls. Classic MSC solution uses TDM backbone technology.

Mobile Switch CenterMobile Switch Center (MSC) is the heart of the entire network connecting the fixed line network and the mobile network. It manages all call related functions (call routing, call setup and basic switching functions) and billing information. MSC handles multiple BSCs and also interfaces with other MSC's and registers. It also handles iner-BSC handoffs as well as coordinates with other MSC's for inter-MSC handoffs.

Media Gate WayThe Media Gateway for Mobile Networks (M-MGw) connects the Mobile Core Network with external networks such as WCDMA and GSM Radio Access Networks, PSTN, Private Automatic Branch Exchanges (PABXs), IP Multimedia Subsystem or Voice over IP (IMS/VoIP) networks or other Mobile Networks. It resides in the connectivity layer of the core network and it is remotely controlled by the MSC-Server using Gateway Control Protocol (GCP). MGW use standard protocols and it is able to communicate with other nodes using TDM, ATM and IP networks.IP signaling M-MGW supports IP (IP version 4) traffic and signaling both over fast Ethernet and Gigabit Ethernet. M-MGW provides payload transport over IP for Nb, lu and Mb interfaces as well as signaling over IP.InterfacesM-MGW has several interfaces to connect to other network elements;Nb interface It is an interface that connects the M-MGW to another M-MGW, the IP bearer connections over the Nb interface are made with the help of IP Bearer Control Protocol (IPBCP) and IP payload is carried over these protocols NbUP/RTP/UDP/IPv4/Ethernet.The diagram below shows Protocol stack for Nb interface. NbUP : is a protocol used between two MGWs and is used to carry user payload traffic (64 Kbps PCM of data or compressed speech).RTP : Real Time Transfer Protocol is used to transport user data, maintain delivery order of packets and specify timestamp of a packet.UDP : is a protocol used to multiplex the IP payload traffic.IPV4: it is a protocol that used for storing addressing information and some control information of packets, this would enable the packets to be routed in the network.Ethernet: is used for transportation and connection.

lu InterfaceIt is an interface that connects the MGW and the Radio Access Network. IP bearer connection over the lu interface are made possible by the help of Gateway Control Protocol (GCP) , Radio Access Network Application Part (RANAP) and payload luUP/RTP/UDP/IP.The figure below shows the protocol stack for lu interface

luUP lu User Plane is a framing protocol used to convey or support the user data that is associated to Radio Access Bearers.Mb Interface It is an interface that connects MGW to IP Multimedia Subsystems (I MS) network. In this interface the IP payload is transported directly over RTP. The protocol stack of Mb interface is shown below. Node Element managerIts a Graphical User Interface (GUI) that is used to manage the M-MGW by using Managed Objects (MO).The main tasks in node manager is the fault management, software management and configuration management of the MGWManaged Objects in MGWa) ATMb) Devicesc) Equipmentd) MGW Applicatione) Signalingf) Software managementg) Synchronizationh) System Configurationi) TDMSignalingSignaling refers to the exchange of information between call components required to provide and maintain service. In GSM network, type of signaling that is used is called SS7 signaling. SS7 is a global standard for telecommunications defined by the International Telecommunication Union (ITU) Telecommunication Standardization Sector (ITU-T). The standard defines the procedures and protocols by which network elements in the public switched telephone network (PSTN) exchange information over a digital signaling network to effect wireless and wired call setup, routing and control. Signaling network consist of Signaling Point (SP), Signaling Transfer Point (STP) and Signaling Link (SL)

Signaling LinkSignaling Link is defined as a bidirectional channel that carries SS7 messages and exchange it between network elements over 65kbps. Signaling links occurs out of band on dedicated channels rather than in band channel that carry voice. Signaling link provides with the following functions, faster call setup times, efficient use of voice circuits and support Intelligent Network (IN) services. Signaling PointSignaling Point in SS7 is identified by a numeric point code. Point codes are used to identify the source and the destination of each message in SS7. There are 3 types of signaling point:a) Service Switching point (SSP) is responsible for terminating or originating calls. It sends a message to another SSP to set up, manage and release voice circuits needed to complete a call.b) Signal Transfer Point (STP) routes each incoming message to an outgoing signaling link based on the routing information contained in the SS7 messages.c) Signaling Control Point (SCP) serves as the interface to the telephone company database.

The figure below shows the architecture of SS7

Protocol stack of SS7SS7 protocol stack provides a set of rules in which data or information is transmitted and received over data communication network. SS7 protocol stack maps Open System Interconnect (OSI) model. SS7 is divided into 4 separate layers. The first three layers Physical, data and network layer make what is called Message Transfer Part (MTP). MTP is responsible for transmitting messages between signaling nodes.

Physical layer or MTP level 1 this layer is used for physical connection. It converts the digital data into bit stream transmission. It is defined for use by different interfaces.Data layer or MTP level 2 used for error detection or correction. It ensures accurate end to end transmission of a message across a signaling link. Network Layer or MTP level 3 provides message routing between signaling points in SS7 network. It is also responsible for message discrimination (determines to whom the message is addressed).User and Application Parts This layer is made up of the following protocols, SCCP, TUP, ISUP and TCAP SCCP Signaling Connection Control Part provides connectionless and connection oriented network services and Global Title Translation (GTT) capabilities. CTT is a mechanism whereby the destination signaling point is determined by the digits present in the signaling message.TUP Telephone User Part is used to handle analog circuits used to carry voice traffic.ISUP ISDN User Part is used to set up and manage trunk circuits used to carry voice and Data calls over Public Switched Telephone Network (PSTN).TCAP Transaction Capabilities Applications Part support exchange of non circuit of related data applications across the network using SCCP. IT also enables use of intelligent network services.

MSC Daily Routine Commandsa) Prcstate, cluster node and alist checks the state and alarms on APG40.b) Allip:acl=a1 prints the alarm list of class A1 only.c) Gdstp prints the status of the Group Switch.d) Nsstp and caclp cheks the clock reference.e) Syrip:survey prints software recovery information.f) Exrpp:rp=all cheks the status of the Regional Processor.g) Exemp:em=all,rp=all cheks the status of the External modules.h) C7ltp:ls=all checks the status of all the defined link sets.i) C7rsp:dset=all prints the routing data for all destination.j) C7ncp:ssn=all,sp=all prints network configuration data for all Signaling Point (SP) in SCCP network.k) Ntstp:snt=all prints the state of the Switching Network Terminal.l) Tpstp:sdip=all prints the state of all Synchronous Digital Paths.m) Dtstp:dip=all prints the state of the Digital Path.n) Strsp:r=all check the status of all defined routes.o) Blorp used to check all the blocked route.p) Ahstp:atmport=all prints the state of all defined ATM ports.q) Dbtsp:tab=saactions checks pending Size Alteration Event (SAE).r) Dbtsp:tab=saefaults checks the SAE faults.s) Erepp:enum=all prints event reporting data for all specified event numbers.General Packet Radio Services General Packet Radio Service (GPRS) is network that offers packet data services to Global System for Mobile Communication (GSM) and Wideband Code Division Multiple Access (WCDMA) systems. GPRS provides with the following functions; efficient transport of packets in cellular network, Connectivity to other external Packet Data Networks (PDNs) using IP, it also provides with simultaneous Circuit Switched and Packet Switched services. The backbone of GPRS is built on 2 GPRS Support Nodes (GSN) known as Serving GPRS Serving Node (SGSN) and Gateway GPRS Support Node (GGSN).Overview of GPRS for GSM

Overview of GPRS for WCDMA

Serving GPRS Support Node SGSN handles all packet switched data within the network. It also provide with mobility and session control for the mobile station. SGSN has several interfaces connecting it to other network elements. A) Gb Interface connects the SGSN to the BSC in GSM network.B) Gf Interface connects the SGSN to the Equipment Identity Register (EIR)C) Gn Interface connects the SGSN to the GGSND) Gr Interface connects the SGSN to the HLR.E) Gs Interface connects the SGSN to the MSC/VLRF) lu Interface connects the SGSN to the RNC in WCDM network. It can also be simplified into 2 parts where there is lu-C interface that connects signaling messages to the RNC and lu-U interface that connects user data to the RNC.

Each of the interfaces uses the protocols in order to allow transfer of packets from one node to another. The picture below shows the protocols used in GPRS network.

GPRS Mobility Management (GMM) is used to handle mobility issues such as roaming.

Sub Network Dependent Convergence Protocol (SNDCP) provides services to high layers which may include connectionless and connection oriented mode.

Logical Link Control (LLC) is used for multiplexing of protocols such that they can be carried on the same network medium, it also ensures reliable flow control and helps in error correction.

Base Station Subsystem GPRS Protocol (BSSGP) handles paging request form the SGSN to the BSS and it also provides with flow control between the SGSN and the BSS.

Network Service (NE) manages the convergence sub layer that operates between the BSSGP and the Frame Relay.

User Datagram Protocol (UDP) it is an interface between the IP and the upper layer processes it is used to multiplex IP payload traffic.

Radio Access Network Application Part (RANAP) it is used in 3G for signaling and GTP connections between the SGSN and RNC.

Signaling Connection Control (SCCP) provides end to end routing for TCAP messages.

MTP level 3(MTP3) User Adaptation layer (M3UA) enables SS7 protocols user parts (IUSP, TUP and SCCP) to run over IP using Stream Control Transmission Protocol (SCTP).

Message Transfer Part Layer 3 (MTP-L3) routes SS7 signaling messages to public networks nodes by means of Destination Point Codes (DPC).

Stream Control Transmission Protocol (SCTP) it is a Signaling Transport (SIGTRAN) it was designed to transport PSTN signaling messages now it also have the capabilities of transporting IP. It is always on top of IP.

Signaling ATM Adaptation Layer (SAAL) is responsible for reliable transfer of signaling messages between nodes. It is a protocol in control plane of ATM that is different from the user plane. It is always on top of ATM.Asynchronous Transfer Mode (ATM) it is a connection oriented technology which have protocol suite which helps in carrying all traffic on a stream of fixed 53 bytes.

GPRS Tunneling Protocol (GTP) it is a group of IP based protocols used to carry General Packet Radio services to GSM or WCDMA networks.GPRS Tunneling Protocol- User (GTP-U) it is used to carry user data within the GPRS core network.

GPRS Tunneling Protocol-Control (GTP-C) it is used within the GPRS network core for signaling. For example it allows the SGSN to activate the session (PDP context). Base Station Subsystem Application Part (BSSAP+) it enables paging of for voice connections from MSC via SGSN.

Message Transfer Part Layer (2MTP-L2) it provides error detection, sequence checking and initiate retransmission in a case of incorrect reception of messages. Transaction Capabilities Application Part (TCAP).

E1/T1 this is the physical layer that is used for connection between different Notes in the WCDMA, GSM and GPRS network.

Mobile Application Part (MAP) it is a SS7 protocol that resides in application and user parts in SS7 protocol stack. It helps the application layers in GSM, WCDMA and GPRS to communicate with each other in order to provide services to Mobile Stations.

Gateway GPRS Support NodeGGSN is responsible for interworking between the GPRS network and external packet switched network like internet.

Mobility ManagementMobility Management (MM) describes the state of the Mobile Station in SGSN perspective.The states differ for GSM and WCDMA networks. There are four states of GSM Mobility Management and three states for WCDMA Mobility Management.GSM Mobility ManagementA) Idle Mobile Station (MS) is Idle state if it is not attached(it has not shown its presence in packet switched network) hence the SGSN cannot locate it or reach itB) Ready MS is in ready state if it is attached or if there is existence of Packet Data Protocol (PDP) context. It also means that a signal procedure or payload transfer is ongoing. In ready state the location of MS is known by the SGSN with an accuracy of the serving cell and in this stage paging is not required to reach the cell.C) Standby Reachable in this state paging is required to reach the cell. The location about the MS is only known on the cell level. D) Standby Not Reachable The location information about the MS is only known on the Routing Area (RA) level.

WCDMA Mobility Managementa) PMM Detached the MS in this state it is not attached. The MS location is not known and it is not reachable by the SGSN.b) PMM Connected in this state the MS is attached. The MS location is known with the accuracy of the serving Radio Network Controller (RNC) and there is no paging required to reach the MSc) PMM Idle in this State the paging is required to reach the MS because the location of the MS is known by the SGSN with an accuracy of the serving RA.

Session Management

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Adjunct Processor (AP) is a decentralized form of signaling control point (SCP) databases that are used by switching systems to reduce the requirement of signaling service point (SSP) central office switches from connecting to SCPsAdjunct Processor. In the advanced intelligent network (AIN) architecture, a decentralized service control point (SCP) that supports service offerings limited either to a single service switching point (SSP) or to a regional subset of SSPs. An AP might support routing tables or authorization schemes specific to a single switch or to a regional subset of switches++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Health CheckNetwork ElementCP LOAD %License UtilisationDevice pool utilisationRoute utilisationSignaling congestionMajor AlarmsCommentWVL-MSC02N/ARouteUtilization (%)WVL-MSS140N/AN/ABSC231%NoneNoneBSC452%NoneNoneMSS2 (BICC)5%NoneNoneMSS3 (BICC)47%NoneNoneMSS4 (BICC)7%NoneWVL-MSS221N/AN/ABYOZTE30%NoneNoneMSS1 (BICC)5%NoneNoneMSS3 (BICC)30%NoneNoneMSS4 (BICC)1%NoneWVL-MSS343N/AN/ATelecel53%NoneNoneNetOne Outgoing62%None4E1S DOWNBTS AND TRANSMISSION (MUDODO 505)WORKING ON THE E1sNetOne Incoming99%None4 E1S DOWNBTS AND TRANSMISSION (MUDODO 505)WORKING ON THE E1sTelone incoming94%None2 signalling links downBTS AND TRANSMISSION (MUDODO 505)WORKING ON THE E1sTelone outgoing34%None2 signalling links downBTS AND TRANSMISSION (MUDODO 505)WORKING ON THE E1sLiquid Telecom39%NoneNoneTelkom SA93%NoneNoneBSC334%NoneNoneBSC50%NoneNonePockets37%NoneNoneMSS1 (BICC)36%NoneNoneMSS2 (BICC)40%NoneNoneMSS4 (BICC)15%NoneWVL-MSS417N/AN/AMSS1 (BICC)7%NoneNoneMSS2 (BICC)1%NoneNoneMSS3(BICC)15%NoneNoneBSC526%NoneNoneBYO-MSS112360.3N/ABYO-Z-VMS0.1NoneNoneHRE-Z-MSCS1210.8NoneNoneHRE-E-MSC2A32.7NoneNoneHRE-E-MSC2B32.1NoneNoneMASVINGO_BSC28NoneNoneGWERU_BSC37.7NoneNoneBYO_BSC110.9NoneNoneBYO_BSC29.2NoneNoneBYO_BSC36.5NoneNonePKT-MSS12769.2HRE-Z-VMS0.8NoneNoneBYO-Z-MSC119.8NoneNoneHRE-E-MSC3A35NoneNoneHRE-E-MSC3B38.7NoneNoneHRE-Z-CALLCENTER69.4NoneNoneHRE-Z-iBSC129.4NoneNoneHRE-Z-iBSC225.9NoneNoneHRE-Z-iBSC320.4NoneNoneWVL-MGW15738NoneNoneWVL-MGW33943NoneNoneWVL-MGW4115NoneNoneBYO-MGW2940NoneNonePKT-MGW14351.4NoneNonePKT-MGW24561.6NoneNoneBYO-MGW3142-BYO-MGW3218-WVL-HLR12968%WVL-HLR22961%PKT-HLR11085.1BYO-HLR110-WVL-BSC1NOT IN USENOT IN USENO LONGER IN USEWVL-BSC219%27%NoneWVL-BSC325%25%NoneWVL-BSC435%40%NoneWVL-BSC59%10%NoneP/Hill-iBSC1Ave=33.33%, Peak=59%P/Hill-iBSC2Ave=24%, Peak=51%P/Hill-iBSC3Ave=13%, Peak=22%BYO-iBSC1Ave=15.5 Peak=25%BYO-iBSC2Ave=10%, Peak=15%MAT-iBSCAve=8%, Peak=12%Gweru-iBSCAve=21.75%, Peak=40%Masvingo-iBSCAve=30.5%, Peak=42%BYO-RNCAve=1%, Peak=6%Network ElementCP LOAD %LicenseLicense Utilisation %Interface utilisationSignaling congestionMajor AlarmsCommentInterfaceUtilization (Mbps)WVL-SGSN46SAU18.93Gb_NoneNoneBandwidth KPIs not available, work being done to restore stats.PDP38.93Iu_NoneBandwidth KPIs not available, work being done to restore stats.WVL-GGSN3PDP39.44Gn_N/ANoneBandwidth KPIs not available, work being done to restore stats.PKT-SGSN18SAU21.05Gb7.14NoneNonePDP2.80Iu4.39PKT-GGSN7PDP2.35Gn9.52N/ANoneNetwork ElementCapacityCapacity UtilisationRemarkReceive LevelsMajor AlarmsCommentHarare Bulawayo F1OKNoneIntermittent Interference on the link, Txn Planing working on itHarare Bulawayo F2OKNoneIntermittent Interference on the link, Txn Planing working on itHarare Bulawayo F3OKNoneIntermittent Interference on the link, Txn Planing working on itHarare-MutareOKNoneHarare Masvingo F10KNoneHarare - Masvingo F2OKNoneMte-NyangaOKNoneMte-ChipingeOKNoneHarare - BinduraOKNoneHarare ChinhoyiOKNoneHarare - KaribaOKNoneHarare - Mutorashanga/Mt DarwinOKNoneHarare - NyamapandaoknoneHarare- SDH RingNonePowertel(Leased)OKNoneTelOne (Interconnect HIT 7050)OKNoneTelOne interconnect(RadioOKNoneAccess LinksOKFAN AlarmFans not installed at KNA, Marimba, Parktown, Vainona & WvlTelecelOKNoneTSA - 01 (Telkom 6m)TX=8 E1s RX= 8E1s100%Voice Incoming only.OKNoneLT - 01 (LT- 11m)TX=19.0Mbps RX = 20.0Mbps100%48E1s Voice + Ecoweb PrimeOKNoneLT - 02 (Ecoweb on 11m)TX=03.5Mbps RX= 14.0Mbps100%Ecoweb StandardOKNoneLT - 03 (LT - 4m)TX= 15Mbps RX=77.0Mbps100%EcowebOKNoneLT-04(LT-11m ERP)TX=04.0Mbps RX=04.0Mbps100%ERP ProjectOKNoneHre PowertelOKNoneBYO Ring1OKNoneBYO Ring2OKNoneBYO Ring3OKNoneBYORing4OKNoneBYO-MVOOKNoneMVO-BBG F1OKNoneFDL-RNCOKNoneMVO-CRZOKNoneCRZ-CHEOKNoneBYO-VFL ECOOKNoneBYO-PlumOKNoneVic Falls TeloneOKNoneBYO-ColleenOKNoneByo-Hre(LT)OKNoneByo Ring(LT)OKNoneSouthern Access linksOKNone