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5-17

MINI-LINK BAS

EN/LZB 111 0542 P2B

Technical Description

5.4.2 Frame 

Alignment

Frame alignment for the radio frame is performed by using the first
group polling permit plus the CRC-P as a FAW.

Frame recovery is achieved in the NU by detecting the FAW. This
unique pattern marks the beginning of each radio frame. Two
consecutive FAWs will be far apart as many bits as specified by the
frame format.

When FAW is detected for three consecutive times, the receiver in NU
can be assumed as aligned with the transmitting RN. If FAW is not
detected in the expected position for four consecutive times, then the
receiver in NU can be considered to have lost the frame alignment to
the transmitting NCU and consequently a loss of sync is issued.

5.4.3 Scrambling

Data stream received from the MAC layer is scrambled in order to
guarantee the right shape in output spectrum, to provide enough
transition for clock recovery purposes, to support security of data.

Scrambler is synchronous with the TDMA/TDM frames; at the
beginning of a TDMA/TDM frame the scrambler register is preset to a
known value. This value can be either all “1”s fixed or derived from
the RN identity, 20 ASCII characters.

In the RN the slots received from the MAC unit are scrambled, FEC
encoded and input to the modulator. The data stream is then converted
to analogue signal, frequency up-converted and sent towards the
outdoor RAU.

The signals coming from the outdoor RAU are frequency down-
converted and in the demodulation process translated to a digital data
stream, then FEC is decoded, descrambled and sent to the MAC unit.

FAW, guard and preamble are not scrambled.

5.4.4 FEC

Error performance is a major issue for wireless ATM systems. Two
main error sources are expected:

•

 

Errors due to propagation anomalies, mainly rain outage

•

 

Errors due to presence of unwanted signals

•

 

Errors due to interference from neighbouring cells

FEC capability is foreseen in the physical layer to improve robustness
to transmission impairments.

Содержание MINI-LINK BAS

Страница 1: ...MINI LINK BAS Technical Description...

Страница 2: ...d consumers the world over Ericsson Information on Demand Database can be addressed at http www ericsson com We continuously develop and improve our products and therefore reserve the right to alter t...

Страница 3: ...1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description MINI LINK BAS Technical Description Copyright Ericsson 2000...

Страница 4: ...nstallation Manual Operation and Maintenance Manual Planning and Engineering Manual Product Catalogue Technical Description The purpose of this description is to support the reader with detailed infor...

Страница 5: ...representative for latest details and data The specifications or configuration contained in this document are subject to change without notice due to continuous design improvement If there is any conf...

Страница 6: ...2 6 2 2 2 1 R AAS 2 8 2 2 2 2 ODU 2 10 2 2 3 C AAS 2 11 2 2 4 Control and Management 2 11 2 2 4 1 CP 2 11 2 2 4 2 EM 2 11 2 3 Configuration Limits 2 12 2 4 System Interfaces 2 12 2 4 1 Intra System In...

Страница 7: ...ink only 5 7 5 2 2 Radio Link Adaptation 5 8 5 2 3 Modulation 5 8 5 3 RAUs 5 9 5 3 1 Block Diagram 5 10 5 3 1 1 Transmitter On Off Switch 5 13 5 4 LLC Layer 5 14 5 4 1 TDMA TDM Framing 5 14 5 4 1 1 Do...

Страница 8: ...6 4 Equipment Errors and Error Handling 6 22 6 6 5 Equipment Audit 6 22 6 7 Connection Management 6 23 6 7 1 Connection Configuration 6 23 6 7 2 Cross Connection Re establishment 6 24 6 7 3 Connection...

Страница 9: ...AAS Radio ATM Access Shelf 8 2 8 2 1 1 PSU 8 3 8 2 1 2 Fan Unit 8 3 8 2 2 RAU 8 4 8 2 3 Antenna 8 5 8 2 3 1 Antenna for Point to Multipoint Connection 8 5 8 2 3 2 Antenna for Point to Point Connection...

Страница 10: ...m 9 17 9 7 4 Stop CP 9 17 9 7 5 Install New CP Software 9 17 9 7 6 Upgrade Network Database 9 17 9 7 7 Start Control Processor in Upgrade mode 9 18 9 7 8 Execute Upgrade 9 18 9 7 9 Restart Control Pro...

Страница 11: ...111 0542 P2B Technical Description 10 6 3 EMC 10 14 10 6 4 Alarms 10 14 10 7 Characteristics 10 15 10 7 1 Central Office 10 15 10 7 2 AT 10 16 10 7 3 ODU 10 17 10 8 Miscellaneous Features 10 20 11 Ind...

Страница 12: ...MINI LINK BAS 10 Technical Description EN LZB 111 0542 P2B...

Страница 13: ...1 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description Introduction...

Страница 14: ...idening The MINI LINK BAS meets these requirements Performance data meets or surpasses the detailed requirements specified for this type of equipment 1 2 Manual Structure The Technical Description was...

Страница 15: ...duct development of powerful functions operational reliability and quality have resulted in the MINI LINK BAS MINI LINK BAS is a product for point to multipoint and point to point connections carrying...

Страница 16: ...gure 1 1 General Applications for the BAS 1 3 2 Product Benefits The MINI LINK BAS offers to name a few the following features true Fast Dynamic Capacity Allocation F DCA for data services port to por...

Страница 17: ...and simplifies production even further The design is compact and integrated The radio and antenna form an integrated outdoor part clean cut concept the outdoor part holds all frequency dependent unit...

Страница 18: ...ror Ratio C AAS Concentration Shelf CB Channel Bank CBR Constant Bit Rate CE Circuit Emulation CE AAS Circuit Emulation Shelf CE Board Network side Circuit Emulation card CEPT Conference on European P...

Страница 19: ...nal Communication System IEC International Electrotechnical Commission IF Intermediate Frequency IP Internet Protocol IRCC Internally Radio Communication Channel ISDN Integrated Services Digital Netwo...

Страница 20: ...ution Unit PID Process Identification Number PLL Phase Locked Loop PMP Point to Multi Point POTS Plain Old Telephone Service POU Power Unit PRC Primary Reference Clock PSTN Public Switching Telephone...

Страница 21: ...e TDM Time Division Multiplex TDMA Time Division Multiple Access TMN Telecommunication Management Network UAT Unavailability UBR Unspecified Bit Rate UDT Unstructured Data Transfer UF Uplink Efficienc...

Страница 22: ...MINI LINK BAS 1 10 Technical Description EN LZB 111 0542 P2B...

Страница 23: ...2 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description System Description...

Страница 24: ...T1 to OC 3 STM 1 155 Mbps ATs support a wide variety of services from PBX interconnections to LAN to LAN interconnect and Internet access over different types of interfaces such as E1 T1 and Ethernet...

Страница 25: ...rt a footprint over a geographical area Each cell is comprised of a Hub with multiple RNs equipped with sector directional antennas for point to multipoint and point to point connections The ATs requi...

Страница 26: ...U ODU Radio and antenna 3 C AAS 4 Control and management CP EM RNs are housed in R AAS A Radio Hub site can contain one or more RNs plugged into one or more R AASs The multiple shelves can be co locat...

Страница 27: ...rk and the subscriber equipment Each AT is assigned to a RN and receives downlink broadcast traffic from that RN using the TDM scheme AT transmits uplink traffic to the RN in a TDMA fashion sharing th...

Страница 28: ...usable for maintenance operations 2 2 1 2 ODU The ODU consists of a Radio and a directional antenna Low Profile parabolic type 0 20 m integrated within its casing Optionally an integrated 0 60 m ante...

Страница 29: ...gle plug in unit The Modem board provides the IF interface towards the outdoor mounted radio and contains all modulating demodulating functions The Modem is also in charge to maintain the radio links...

Страница 30: ...cted to an ODU which is dedicated to a RN in a sector R AAS can also house ET and CE SNI boards ET boards provide Wide Area Network WAN connectivity towards ATM backbone IP router C AAS CE SNI boards...

Страница 31: ...by RNs inserted into the same R AAS P S U P S U FAN R AAS SUB ID TX RX SLOT2 TX RX SLOT3 TX RX SLOT4 TX RX SLOT5 TX RX SLOT6 TX RX SLOT7 TX RX SLOT8 TX RX SLOT9 Figure 2 5 ODU and the R AAS R AAS prov...

Страница 32: ...er For User to Service connections CE traffic from various RN can be terminated in the R AAS using the CE SNI E1 T1 board As an alternative it can be connected through an ET155 to an ATM network and t...

Страница 33: ...The CP constitutes the agent that carries out all of the EM User commands acts as the repository for the system database and oversees control of the overall system It is a UNIX based shelf mounted pr...

Страница 34: ...rfaces 2 4 1 Intra System Interfaces ET155 ATM 155 Mbps IR SONET STS 3c Bellcore GR 253 CORE S1 1 SDH STM 1 ITU T G 957 Full duplex Single mode optical interfaces Radio Interface Channel spacing 28 MH...

Страница 35: ...d full duplex Electrical interface with Multiprotocol over ATM Adaptation Layer 5 encapsulation RFC 1483 Note This functionality minimizes the system impact on supporting LANs 2xDS1 CE_NU_T1 SU ITU G...

Страница 36: ...ET STS 3c Bellcore GR 253 CORE S1 1 SDH STM1 ITU T G 957 Full duplex Single multi mode optical interfaces ET34 45 ATM E3 T3 34 45 Mbps Full duplex Electrical interface DS3 direct and PLCP mapping avai...

Страница 37: ...3 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description Network Architecture...

Страница 38: ...MINI LINK BAS network can be tailored to very different scenarios in terms of subscribers or traffic density This chapter describes basic configurations and the rules to build large configurations Net...

Страница 39: ...the high number of links and their length MINI LINK BAS provides an effective solution by the use of a C AAS close to the PSTN Traffic collected from the R AASs can be transported toward the C AASs th...

Страница 40: ...I LINK BAS networks where several SN R AAS are present and a high number of CE connections are transported and terminated within the system ATM network System Node C AAS CE Shelf stand alone One PVC f...

Страница 41: ...ust be noted that the intermediate configurations are possible In fact as the CE boards can be hosted both into the R AAS and into the C AAS additional PSTN links could be obtained using available slo...

Страница 42: ...des SNs The numbers of SNs each CP can manage is mainly dependent on the total number of ATs A single EM can manage up to 10 CPs In the management perspective the CP is the agent whilst the EM is the...

Страница 43: ...55 board housed in the slot 1 of shelves either R AAS or C AAS The ET 155 board exploited for CP local connection is no longer available for traffic Only one SN can be managed by the CP local mode bec...

Страница 44: ...PBX ET NCU NCU ET CE CE ET ET155 ET34 45 R AAS ET NCU NCU R AAS ET155 ET34 45 C AAS CE Shelf FlexNU AT PBX FlexNU AT Ethernet E1 T1 PBX ATM Network PSTN Network CE CP EM MS Figure 3 5 Network Example...

Страница 45: ...synchronization is also a suitable choice since once timing of SDH network and PSTN network are traceable to the same PRC If it is not the case and the two networks are traceable to separate PRC byte...

Страница 46: ...ns are allowed without resorting to the backbone network Internal traffic is generated whenever AT to AT connections are established within a sector without exploiting R AAS resources or within a sing...

Страница 47: ...in the diagram For local leased line interconnection applications this can reduce the load on the ATM mux switch and other associated central office equipment PBX AT AT AT AT Radio Shelf C AAS CE She...

Страница 48: ...PSTN PBX H 323 terminal Subscriber s datacom traffic is bridged at Ethernet interface to provide a demarcation point between the CPE LAN and the public network Typically a router can provide the opera...

Страница 49: ...4 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description End User Services...

Страница 50: ...sed on the telephony network infrastructure with a permanently allocated capacity and a granularity of 64 Kbps MINI LINK BAS offers both permanent capacity allocation for PBX interconnectivity and the...

Страница 51: ...tors with the aim to prevent the allocation of an excessive bandwidth to ATs located in not fully deployed sectors This plain best effort service is the only service available for the built in Etherne...

Страница 52: ...nication MINI LINK BAS Ethernet 10base T Router ISP Layer 2 or Layer 3 ATM ATM PHY SDH PHY SDH ATM Node Figure 4 2 Protocol Stack Model for Ethernet Frames in MINI LINK BAS The connection through the...

Страница 53: ...to the one available in the Ethernet frames The Ethernet FCS field can therefore be omitted in the encapsulated frame to save bandwidth In this case it is reinserted when the Ethernet frame is rebuil...

Страница 54: ...nterfaces are mapped into ATM cell payload using the AAL 1 Unstructured Data Transfer UDT mode adaptation layer The synchronous or plesiochronous modes of operation are selectable per port basis via t...

Страница 55: ...port delay Cell delay variation compensation delay The ATM packetization delay is related to the time needed to fill one ATM cell with the CE data In the E1 and T1 case this value is equal to 183 and...

Страница 56: ...MINI LINK BAS 4 8 Technical Description EN LZB 111 0542 P2B...

Страница 57: ...5 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description Physical and MAC Layers...

Страница 58: ...loops C QPSK Modulation in both uplink and downlink Automatic Transmit Power Control ATPC in uplink direction to prevent the ATs to create unnecessary interference to other MINI LINK BAS Cells and lim...

Страница 59: ...NODE ATM PHY PHY Cell bus Radio ASS NNI NNI ATM Node ATM PHY PHY CE ATM PHY C AAS CE Shelf Service Network Interface ATM PHY PHY Figure 5 1 Generic MINI LINK BAS System Model 5 2 Physical Layer The se...

Страница 60: ...oller IF2 LO2 uP IF1 LO1 to from Modem Figure 5 2 Radio Board Functional Block Diagram Scambler uP FEC Enc D A C QPSK Endcoder IF Modulator RCL and Ranging Handler De Scrambler FEC Dec A D C QPSK Dete...

Страница 61: ...oop at the AT side Modulation Index Local Remote loop in Down Link Local Remote loop in Up Link Clock Phase Only internal Local Loop in Up Link The internal and radio loops share the same error detect...

Страница 62: ...levant to the amplitude is evaluated in the node modem exploiting also the RSSI information coming from radio The transmitted power is fine tunable in the terminal radio only The RN sends via Internal...

Страница 63: ...to the corresponding transmitter by means of a RCL message over the air interface The RN modulation index compensation uses a subset of the active terminals to receive the feedback 5 2 1 4 Clock Phase...

Страница 64: ...dulator output into the demodulator input using a local shift oscillator that carries the 350 MHz signal down to 140 MHz Operation and administration signal needed to the RAU board processor are sent...

Страница 65: ...hoisting It fits on the back of the integrated antenna unit where it is connected to the RF port Physically a printed board assembly RF Multi Chip Modules MCMs and branching filters constitute the MI...

Страница 66: ...ircuit TX ON OFF TX ON OFF Output Level Control Output Level Set Receive IF 140 MHz Signal Down Converter Filter Amp Down Converter Receiver Low Noise Amp Command Control Signal Control Supervision Pr...

Страница 67: ...vel is used to generate an alarm indicating that the transmitting IF signal level is too low due to excessive cable losses Receiving IF Signal Processing 140 MHz receiving IF signal from the microwave...

Страница 68: ...nsmitted output power it s checked for supervision output power alarm RF Loop An attenuated replica of the transmission signal is mixed with a shift oscillator signal and is fed into the receiver for...

Страница 69: ...3 1 1 Transmitter On Off Switch While the RN RAU transmits in a continuous way due to the TDMA structure adopted in uplink the AT RAU transmits in a burst way so it s necessary to switch on the NU tr...

Страница 70: ...direction the access has to be managed because of the concurrent requests from terminals whereas in the downlink direction there is no contention that data streams come from a backbone network Up and...

Страница 71: ...lots 80 Slots 1ms The polling of all NUs is done in consecutive slots which means that 64 NUs are polled in 8 slots The above mentioned length of radio frame will give a period time of 1 2 ms The Fram...

Страница 72: ...rded Ranging slot has a specific format as it is used in the ranging procedure Terminal identity and unique word are functional for the ranging procedure while a CRC 16 is foreseen for ranging informa...

Страница 73: ...ion for clock recovery purposes to support security of data Scrambler is synchronous with the TDMA TDM frames at the beginning of a TDMA TDM frame the scrambler register is preset to a known value Thi...

Страница 74: ...on the mismatch detected on the byte referred as CRC 8 as this byte is meant to detect errors in a complete TDMA TDM slot encompassing then both ATM cell and permit field The performance parameters ar...

Страница 75: ...slots Number of CRC 8 errors on downlink calculated over permit CRC P and the ATM cell Some additional performance parameters not foreseen by ITU standards are evaluated Received RF power max min aver...

Страница 76: ...analyse the incoming permits and take the correct action depending on type of permit The general idea is that no terminal is allowed to send data in uplink direction unless it has received an explicit...

Страница 77: ...d for each NU can specify 64 lines VC connections In the permit field is also foreseen a CRC 8 aimed to check for error and validate the information In case of errors detection the permit is deemed in...

Страница 78: ...ays initiated by command from the CP A unique number or string called terminal identity is associated to each terminal The terminal identity is set by an ACT during installation and is stored in non v...

Страница 79: ...n In multi access systems performances are related to the number of ATs connected to the same RN in terms of throughput In order to make the system have nearly the same performances as the number of s...

Страница 80: ...affic cells are multiplexed with the ATM cells which transport the RC information for modem to modem communication ATM cells received from the cellbus interface are buffered until they can be placed i...

Страница 81: ...handler for ATM layer processing 5 6 2 Uplink Processing Flow Node Radio Unit De Modulator FEC De Scambler De Multiplexer Cellmux Port Backplane Interface Framer MAC RC Cells User Radio Unit Modulator...

Страница 82: ...ATM traffic cells and the RC control cells passing the ATM traffic cells on to the cellmux port and to the backplane interface The RC is using ATM cells in uplink direction as well as in downlink When...

Страница 83: ...5 27 MINI LINK BAS EN LZB 111 0542 P2B Technical Description GFC VPI VPI VCI VCI VCI HEC MESSAGE Figure 5 15 RC Communication Cells...

Страница 84: ...MINI LINK BAS 5 28 Technical Description EN LZB 111 0542 P2B...

Страница 85: ...6 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description Management and Control...

Страница 86: ...may manually reconfigure them The control of a NE is the implementation of self recovering tools able to handle routine tasks such as alarming the operator recovering after a power break upgrading sof...

Страница 87: ...nd communicates with one or more remote CPs The CP communicates with the subtended SNs and AT device nodes and stores in a database all the system s persistent data for example configuration data alar...

Страница 88: ...LINK BAS The EM is connected to the CP which can be considered as the heart of the management system The CP in turn communicates with a number of system elements of different types C AAS CE Shelf R A...

Страница 89: ...fied the CP needs no more than one board relay step to distribute control messages to each DP within the system AT R AAS AT AT R AAS AT R AAS ATM C AAS CE Shelf PSTN CP Board Relay Step Figure 6 3 Boa...

Страница 90: ...witch ATM EM CP ET ET NCU C AAS CE Shelf R AAS AT CE I 1 I 2 I 2 VPI 0 VCI 32 1023 VPI 1 VCI 32 1055 Figure 6 4 I1 and I2 Interfaces I1 Interface The basic assumptions are VP 0 out from the ATM adapte...

Страница 91: ...e board belongs to DP boards can be reached maximum on two levels of shelves downstream board relay function The ATM switch within the network must perform the VP VC switching between the two interfac...

Страница 92: ...VCI 31 2 33 To address a board in slot 4 of the R AAS number 42 the VPI VCI output from the CP is VPI 1 VCI 31 4 35 In case of local CP configurations the ICS connections are automatically set by the...

Страница 93: ...e management In general the EM software may be seen as layered in three levels This architecture allows the system to be very flexible modules at a given level require functionality to modules at the...

Страница 94: ...nds a subscription message to the basic platform that stores the Process Identification Number PID of the process itself and enters it into the list of subscribed processes The applications are writte...

Страница 95: ...ations that have to be started installed 2 The basic platform starts the applications listed in the above mentioned file 3 All applications initialise an internal Erlang process whose purpose which is...

Страница 96: ...Handling The configuration information in the MINI LINK BAS is stored in a Management Information Base MIB A generic basic configuration is loaded in the MIB during installation from software configu...

Страница 97: ...ctivation EMGS Generic Service Support The access user port table is used to represent NU internal ATM connection end points for Ethernet datacom or CE traffic The access service port table contains e...

Страница 98: ...C cross connection Activate VC cross connection Deactivate VC cross connection 6 4 3 Specific Services The specific services layer contains all service and system specific applications that manage equ...

Страница 99: ...arc station Figure 6 7 and Figure 6 8 depict the internal software architecture of the CP Erlang applications OTP Other UNIX processes UNIX Solaris 2 Force Sparc Station CP Figure 6 7 CP Software Arch...

Страница 100: ...lable Proprietary agent this is used to manage the computer and telecommunication networks HTTP agent HTTP is the protocol normally used on the Internet See Note in Paragraph 6 5 BNSI agent BNSI is th...

Страница 101: ...and perform the necessary transaction handling data consistency is ensured 6 5 2 2 Equipment Handler The equipment handler provides a common interface for the management of basic features that are ap...

Страница 102: ...stem Alarms and events have a set of associated properties that define the actions to be taken when they occur for example whether it should be logged where it should be sent to and so on The alarm ha...

Страница 103: ...interface towards the EM is handled by the Managed Resource Interface MRI which is a generic Erlang language based interface between the Managed Resource Server MRS on one side and the management inte...

Страница 104: ...ystem according to the general principle by which software versions are not released on a sub system basis but on a system level This means that when a new software version is defined this includes th...

Страница 105: ...a slot is put into the managed state the slot type become supervised Slots that are defined to hold DPs are supervised directly by the CP The management system starts scanning the network for scanning...

Страница 106: ...ardware processor has a watchdog as well in orderd that if the software supervision process does not update the watchdog circuitry a processor restart is initiated cold restart 6 6 5 Equipment Audit A...

Страница 107: ...re used for the establishment of the connection Disconnect the connection is removed but the resources are retained Release the resources for a connection are freed Non Existent Reserved Connected Not...

Страница 108: ...ion handler database the list of cross connections that are affected by these boards Start an audit for all affected boards This means assuring that the correct cross connections are set up and all ot...

Страница 109: ...m different HHs it is the alarm handler that takes decisions by using an alarm correlation file 6 8 2 Alarm Suppression During system restarts the alarms and events are not forwarded to the management...

Страница 110: ...sued the alarm for example a circuit board and a subrack Alarm type Alarm class the alarm belongs to communications quality of service processing equipment environmental Alarm severity One of the stan...

Страница 111: ...dler at cold restart this latter removes all system internal connection data and keeps only the end points to be sure that no one takes any consideration to the earlier set up For the same reasons the...

Страница 112: ...e of need This will of course require the system to be stopped and restarted according to the following steps Stop the system in a controlled manner Restore the previously backup database Upon success...

Страница 113: ...the responsibility of the agent to find such an information and to present it to the manager In our case the EM makes the role of the manager and the CP represents the agent The protocol requires the...

Страница 114: ...ATM connections are described at Paragraph 6 3 3 Where the DPs loosing contact with the CP will keep their configuration and traffic will continue flowing without modifications When contact is back th...

Страница 115: ...The configuration data is used to find all preconfigured boards and to set up preconfigured cross connections The system remains in this state until all expected boards have been searched and found or...

Страница 116: ...ent handler to avoid control system overload 6 12 3 Hot Restart Hot restart is applied to a part of the CP software or the complete CP software Hot restart does not involve the system hardware that is...

Страница 117: ...s in turn fails a cold restart of the complete CP system will be tried If this also fails a number of times more than 10 times an hour the system will shutdown The hot restart of a HH does normally no...

Страница 118: ...MINI LINK BAS 6 34 Technical Description EN LZB 111 0542 P2B...

Страница 119: ...7 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description ATM Transport and Multiplexing...

Страница 120: ...d by deploying the flexibility of ATM virtual connections and service categories The system exploits the fine bandwidth granularity and the statistical multiplexing capability of ATM ATM transport alo...

Страница 121: ...sed to connect the system with a one armed router must be qualified as service user port if connections must be possible both between the router and the users and between the router and a service netw...

Страница 122: ...e operator except these connections required by the CP reached through an ATM switch or network In such cases the operator is required to set up appropriate connections through the ATM switch or netwo...

Страница 123: ...4 VPIs 9215 27648 in 3 VPIs NNI 16383 4095 16384 in 1 VPI 255 30976 in 121 VPIs 511 30720 in 60 VPIs 767 30720 in 40 VPIs 1023 30720 in 30 VPIs 1279 30720 in 24 VPIs 1535 30720 in 20 VPIs 2047 30720 i...

Страница 124: ...es The combination of CBR and UBR connections has the potential to enable a very effective use of transmission resources 7 3 1 Connection Admission Control Whenever a CBR connection is set up the syst...

Страница 125: ...r exceed the backplane capacity The following table lists the maximum traffic which is presented at an ingress port of the cross connection depending on the type of boards installed Units Maximum traf...

Страница 126: ...orts the ATM fault management and F4 F5 flows handling in the following way VC AIS cells are detected and VC RDI OAM cells are generated by the Ethernet port at FlexNU side according to I 610 No notif...

Страница 127: ...8 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description Equipment Practice and Power...

Страница 128: ...hat drive the outdoor Radios The R AAS has front access connection field with connectors for external alarm and power The connections to the ET and to the NCUs are via front connectors Slot 1 of the f...

Страница 129: ...to RAU The board is designed for 2 wire or 3 wire distribution 48 V return is separated from signal reference ground Input voltage range 38 0 V to 60 V The PSU also provides inputs for alarm signals f...

Страница 130: ...nsions are 260x321x97 WxHxD with a weight of 7 kg The RAU has two connectors on the bottom N female connector for the coax cable carrying DC supply and I F signals from NCU AT An alignment port used f...

Страница 131: ...or RN to single AT Connection Point to Point The RAU is fitted directly to this antenna by default the separate installation is possible through a flexible waveguide connected to the RAU 8 2 3 1 Anten...

Страница 132: ...8 2 3 2 Antenna for Point to Point Connection The standard compact antenna module for point to point connections is a 0 24 m high performance compact antenna of reflector type It has an integrated rad...

Страница 133: ...8 7 MINI LINK BAS EN LZB 111 0542 P2B Technical Description A 0 60 m integrated directive high performance antenna is also available Figure 8 6 0 60 m Integrated Standard Directive Antenna...

Страница 134: ...s Modem Board Power Supply Figure 8 7 The FlexNU Indoor Unit Dimensions according to IEC 60 297 are Height 3U 132 5 mm Width 84T 448 6 mm Depth 240 mm Top and bottom covers fully perforated are made o...

Страница 135: ...tors The FlexNU is supplied by 110 220 Vac 50 60 Hz The power consumption of one AT including the outdoor radio is 70 W The FlexNU can be mounted in 19 cabinets according to ANSI EIA 310 D and IEC 60...

Страница 136: ...rear access shelves are available respectively illustrated in Figure 8 8 and Figure 8 9 The C AAS CE Shelf has 19 board slots Slot 1 of the C AAS CE Shelf is dedicated for the ET to connect the shelf...

Страница 137: ...lf The rear access shelf is based on the same equipment practice as front access The main differences are the rear accessible connection field the champ connectors instead of SubD connectors and the f...

Страница 138: ...Maximum output power is 120 W 8 4 4 Fan Unit for Front Access AAS A fan unit is mounted directly above the front accessible C AAS CE Shelf as a plug in unit with the same characteristics delivered to...

Страница 139: ...one 48 V output 8 4 5 Fan Unit for Rear Access AAS This fan unit is plugged into the rear access C AAS CE Shelf using one 9 pins DSUB connector for both duplicated 48 V power and alarm It has the same...

Страница 140: ...ctionality of the EM is implemented by means of a number of applications each handling a specific management area The applications provide graphical user interfaces through which an operator can manag...

Страница 141: ...SERIAL 1 SERIAL 2 ALARM ext HD POWER ON OFF FUSE POWER INPUT TX RX ATM Adapter Figure 8 11 CP Shelf Front View 8 6 PDU The PDU is an optional unit required if high Ohmic 48 V distribution is not avail...

Страница 142: ...rear access shelves requires 450x305 mm WxD Rear access shelves are not possible to locate in single depth ETSI standard cabinets Since front access C AAS CE Shelf do not fulfil requirements on fire...

Страница 143: ...or for the Hub site if only the R AAS shelf is present the cabinet BYB 502 can be used BYB 502 standard dimensions are 400x600x400 mm HxWxD Up to five cabinets can be stacked and bolted together on a...

Страница 144: ...S 8 18 Technical Description EN LZB 111 0542 P2B Figure 8 14 BYB 502 Cabinets MINI LINK BAS with front accessible shelves can be deployed in various cabinets and racks Same possible configurations are...

Страница 145: ...K BAS EN LZB 111 0542 P2B Technical Description PDU Connection Field R AAS Fan Unit Fan Unit C AAS CE Shelf Connection Field Control Processor PDU R AAS C AAS CE Shelf Figure 8 15 Central Office in Ca...

Страница 146: ...nt 19 or 23 equipment frames Those types of racks are not included in the MINI LINK BAS The rear access system will be delivered on a shelf level MINI LINK BAS with rear access shelves must be deploye...

Страница 147: ...9 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description O M Facilities...

Страница 148: ...CS ATM AT Boards FlexNU ATM network R AAS C AAS CE Shelf CE Ethernet 10BaseT CP EM MS ICS ATM ICS ATM NCU SU DP ICS ATM ICS ATM Figure 9 1 MINI LINK BAS Control Architecture 9 1 1 Communication Channe...

Страница 149: ...urpose For more detailed information about ACT tool refer to the ACT User Guide of the AT installation manual 9 2 Fault Detection The following lists describe the main events and alarms graphically pr...

Страница 150: ...detected but the board ID is not recognisable or not valid for this system An alarm ceasing report alarm severity cleared will be sent when the board is removed bufferOverflow QoS Warning It is sent...

Страница 151: ...etwork synchronisation is lost It is sent whenever critical alarms for example LOS LOF and so on are detected on a specific board ET CE which is master for the network synchronisation lossOfRefClock E...

Страница 152: ...T modem has lost the downstream frame alignment modemModInd Eq Minor Unable to adjust modulation index modemRauPow Comm Critical RAU power supply failure modemRxIFinUp Comm Major Input level from RAU...

Страница 153: ...ad been inserted suRemoved Eq Major A SU has been removed swdlFromPassiveToMode mInProgress Eq Minor A background downloads from the FlexNU FPROM passive part towards the passive area of Modem is in p...

Страница 154: ...at is MAC or modem faulty selfTestFailedOnRadio Loop on radio does not work at RN side that is radio is faulty MAC and modem are working correctly selfTestOk Loop on radio is working at RN side that i...

Страница 155: ...nce condition for the entire RN or for the single AT CE Modem MAC ATM HW Loop I F Loop Radio R F Loop FlexNU AT RN Radio R F Loop Modem MAC I F Loop ET NCU R AAS Figure 9 2 RN Near End Loops and AT Ne...

Страница 156: ...f at IF level FlexNU the AT is working correctly The R F loop is used to check if at radio frequency level outdoor part RAU the AT is working properly 9 3 3 AT Far End Loops The AT Far End loop is use...

Страница 157: ...he performance parameters are evaluated per FlexNU both in uplink and downlink as there are different physical links for each FlexNU In order to do this in the uplink the RN has to take in account the...

Страница 158: ...Acronym Description PRx min Minimum received power PRx max Maximum received power PRx average Average received power PTx min Minimum output power PTx max Maximum output power PTx average Average outp...

Страница 159: ...ing if Status LED is also On STATUS Yellow On FlexNU signed off Blinking Sign on procedure on going Off Signed on LI LED 10BaseT Connector Yellow On Port successfully connected no meaning on PVC Power...

Страница 160: ...Power Fault Power Green On Power On POU Fault Red On Power fail on POU if the LED Power is ON too or loss of input power if only this LED is ON Power Green On Power on PSU Fault Red On Power fail on P...

Страница 161: ...chnical Description Unit Name LED Colour Status Function Link Green On Link on ATM interface Status Yellow Blinking The status is OK CP Slot PMC2 Off The status is not OK Power Green On RAU is power O...

Страница 162: ...escribed here is available in system revision R1C and therefore will be used in the upgrade from R1C to R1D For upgrades from previous versions of the system please refer to operation and maintenance...

Страница 163: ...ent System This operation is optional and implies an upgrade of the EM software Backward compatibility for all the functions involving equipment handling and software upgrade is guaranteed 9 7 4 Stop...

Страница 164: ...on swap and download swap or no action The previous steps are needed to guarantee a robust behaviour of the procedure in any possible case As the download of the load modules is an action totally inde...

Страница 165: ...SW upgrade procedure Note The SW rollback procedure will be available from R1D to R1C in the next release Three cases are considered here 1 The installation of the new SW baseline is completed success...

Страница 166: ...tween the two sw load modules the automatic rollback must be enable only after a new load module download and disable immediately after its execution The AT automatic rollback procedure is depicted in...

Страница 167: ...raffic not affected Traffic interrupted SW Rollback Restore previous SW upagrade file Install previous Management System Stop Control Processor Install previous CP software Restore previous Network dB...

Страница 168: ...1 0542 P2B AT automatic SW Rollback N Last executed command was a load module swap Start Timeout timer Try to reconnect to RN connection OK Y Timeout expired Swap load modules Disable automatic rollba...

Страница 169: ...11 1 MINI LINK BAS EN LZB 111 0542 P2B Technical Description Index...

Страница 170: ...M layers 5 18 ATPC 5 2 B board relays 6 5 C C AAS CE Shelf 8 10 Cabinets 8 16 Central Office 10 15 Circuit emulated services 4 6 Communication Channels 9 2 Connection Management 6 23 Constant Bit Rate...

Страница 171: ...anager 6 9 I I1 Interface 6 6 I2 Interface 6 6 ICS ATM 6 5 Implementation Structure 2 12 Intermediate Frequency 10 8 IP ATM PSTN backbone 2 2 L LMDS A 28 GHz 10 4 local supervision 9 13 Logical Link C...

Страница 172: ...ate 5 23 Radio Link Adaptation 5 8 Radio Node 2 6 Radio Unit RAU 8 4 Radio Units 5 9 RC Cells 5 26 RN near end loops 9 9 S Scrambling 5 17 Service Categories 7 6 Service ports 7 3 sign on procedure 5...

Страница 173: ...LINK BAS EN LZB 111 0542 P2B Technical Description V VC AIS cells 7 8 VC AIS VC RDI cells 7 8 Virtual Connections 7 3 VoIP 3 11 VP VC Connection 7 4 VP AIS VP RDI cells 7 8 VPI VCI values 7 4 W Wind L...

Страница 174: ...MINI LINK BAS 11 6 Technical Description EN LZB 111 0542 P2B...

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