Cisco Systems 15310-MA manual Obtaining Optical Networking Information, Xxix

Page 29

Preface

Obtaining Optical Networking Information

This section contains information that is specific to optical networking products. For information that pertains to all of Cisco, refer to the Obtaining Documentation and Submitting a Service Request section.

Where to Find Safety and Warning Information

For safety and warning information, refer to the Cisco Optical Transport Products Safety and Compliance Information document that accompanied the product. This publication describes the international agency compliance and safety information for the Cisco ONS 15310 system. It also includes translations of the safety warnings that appear in the ONS 15310 system documentation.

Cisco Optical Networking Product Documentation CD-ROM

Optical networking-related documentation, including Cisco ONS 15xxx product documentation, is available in a CD-ROM package that ships with your product. The Optical Networking Product Documentation CD-ROM is updated periodically and may be more current than printed documentation.

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

Subscribe to the What’s New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service and Cisco currently supports RSS version 2.0.

Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2

 

78-19417-01

xxix

 

Image 29
Contents Americas Headquarters Cisco ONS 15310-MA SDH Reference ManualCisco ONS 15310-MA SDH Reference Manual, Release 9.1 Iii N T E N T SFan-Tray Assembly CTC Software Installed on the 15310E-CTX-K9 Card Timing Vii Rolls WindowViii IP-Over-CLNS Tunnel Scenario 2 ONS Node to RouterPerformance Monitoring Snmp Specifications A-1 Xii Threshold Defaults C-425-PR 24-GA CORR-SHIELD Outdoor Cable Assembly Xiv Configurations 12-3 XviJ22 Link Icons Color Codes for Alarm and Condition Severities ONS 15310-MA SDH Card Service State Transitions B-3 Xxi Revision HistoryDate Audience Document ObjectivesRelated Documentation XxiiXxiii Document ConventionsConvention Application Xxiv Warnung Wichtige SicherheitshinweiseXxv Avvertenza Importanti Istruzioni Sulla SicurezzaAviso Instruções Importantes DE Segurança Xxvi Xxvii GEM Disse AnvisningerXxviii Obtaining Optical Networking Information Where to Find Safety and Warning InformationCisco Optical Networking Product Documentation CD-ROM XxixXxx Installation Overview Cisco ONS 15310-MA SDH Shelf Assembly HardwareRack Installation Mounting Brackets ONS 15310-MA SDH Shelf Assembly DimensionsMounting a Single ONS 15310-MA SDH in a Rack Mounting a Single NodeMounting Multiple Nodes Electrical Interface AssembliesFront Door Cisco ONS 15310-MA SDH Shelf Assembly Hardware Front DoorRear Cover Power and Ground DescriptionGround holes 144707 Ground holes Cabling Types Shelf TemperatureCable Description and Installation ACS Cable T015654 PCAM90SPA0PC001 ACS Part Numbers Length DescriptionPCAM90SPA1OC001 PCAM90SPA3MC001Fiber Cable Installation 10 Shelf Assembly with Fiber Guide Installed Coaxial Cable InstallationRing Port Tip Port 4 E1 Cable InstallationSignal Pin Connectors J23 and J24 Not used Ring Port Tip Port Alarm Cable Installation Out 1+ Out 2+ Out 3+ Out 4+ Out 5+ Out 6+ Out 7+ FunctionFunction DB-25 Pin Number DB-9 Pin Number Function Bits Cable InstallationUDC Cable Installation Cable Routing and Management RJ-45 Pin RS-232/64K Number ModeStandard Cable Management Bracket TX +Extended Cable Management Bracket 12 Installing the Standard Cable Management Bracket13 Installing the Extended Cable Management Bracket Fan-Tray AssemblyOrderwire Fan Speed and Power RequirementsFan Failure Air FilterRJ-11 Pin Number Description Cards and Slots 14 RJ-11 Cable ConnectorSTM1/STM4/STM16 BNCCopper SFP-RJ4 LC SFPCard Summary and Compatibility Card ReferenceCard Platforms Description For Additional Information Card SummaryCard Card CompatibilityMA SDH 15310E-CTX-K9 Card 2shows the 15310E-CTX-K9 card faceplate and block diagram4 15310E-CTX-K9 Card-Level Indicators 2 15310E-CTX-K9 Card Side SwitchesSystem Cross-Connect 3 15310E-CTX-K9 Optical InterfacesCE-100T-8 Card 5 15310E-CTX-K9 Port-Level IndicatorsACT/STBY LED Green/Amber It is amber if the card is the standby card3shows the CE-100T-8 card faceplate and block diagram 2 CE-100T-8 Port-Level Indicators 1 CE-100T-8 Card-Level IndicatorsOFF Port-Level Indicators DescriptionCE-MR-6 Card Card Reference CE-MR-6 Card 4shows the CE-MR-6 card faceplate and block diagram ML-100T-8 Card CE-MR-6 Card-Level IndicatorsCE-MR-6 Port-Level Indicators ML-Series Cisco IOS CLI Console Port 1 ML-100T-8 Card Description6shows the ML-100T-8 card faceplate and block diagram 4 ML-100T-8 Port-Level Indicators 3 ML-100T-8 Card-Level IndicatorsE121E3DS33 and E163E3DS33 Cards E121E3DS33 and E163E3DS33 Card Faceplates and Block DiagramBIC Configuration on WBE Cards 1 E121E3DS33 and E163E3DS33 Card-Level IndicatorsFiller Cards Card-Level Indicators DescriptionSFP Modules ONS-SI-2G-I1 ONS-SI-2G-L1 ONS-SI-2G-S1 ONS-SI-2G-L2 Compatibility by Card15310E-CTX-K9 CE-MR-6 SFP Description12 Actuator/Button SFP PPM ProvisioningONS 15310-MA SDH Card and Port Protection OverviewONS 15310-MA SDH Chassis Card Layout 1 11 Electrical Card ProtectionCard Protection ONS 15310-MA SDH Card and Port Protection 3 .15310E-CTX-K9 Card Equipment Protection Lmsp Optical Port ProtectionExternal Switching Commands Automatic Protection SwitchingPage CTC Software Delivery Methods CTC Software Installed on the 15310E-CTX-K9 CardCTC Software Versions in an ONS 15310-MA SDH Node View CTC Software Installed on the PC or Unix WorkstationPC, Unix and Mac Workstation Requirements CTC Installation OverviewRAM Area RequirementsONS 15310-MA SDH Connection Method Description Requirements CTC LoginLAN SDHCTC Window ONS 15310-MA SDH Node View Default Login ViewCard and Slot Color Status Node ViewCTC Card Colors Port Color Service State Description Node View Tabs Node View Card ShortcutsCard Status Description Tab Description SubtabsNetwork View Appendix B, Administrative and Service StatesCTC Node Colors Color Alarm StatusNetwork View Tabs 8lists the tabs and subtabs available in the network viewLink Consolidation DCC LinksIcon Description DCC icon GCC icon OTS icon PPC icon Server Trail iconCTC Card View of an E121E3DS33 Card Card ViewPrint and Export CTC Data Cisco ONS 15310-MA SDH Procedure Guide for specifics Static IP-Over-CLNS Tunnels Static Category IP-Over-CLNS TL1 Tunnel Comments Traffic Card Reset Common Control Card ResetSoftware Revert Database BackupUsers IDs and Security Levels SecurityOSI User Privileges and PoliciesUser Privileges by CTC Action Snmp CTC Tab Subtab Subtab Actions Maintenance Provisioning SuperuserSecurity Policies Run APC/Disable APC RefreshVlan DB APCUser Password, Login, and Access Policies Idle User TimeoutSuperuser Privileges for Provisioning Users Idle TimeAudit Trail Log Entries Audit TrailRadius Security Radius AuthenticationAudit Trail Capacities Shared SecretsSecurity Radius Security Page Timing Parameters TimingSynchronization Status Messaging Network TimingMessage Quality Description Page Circuits and Tunnels Circuit Properties Status Definition/Activity Circuit StatusCircuit States Information about in-service topology upgrades, see , SDHPendingmerge DroppendingLmsp Circuit Protection TypesProtection Type Description Description Circuit Information in the Edit Circuits WindowTerminal Loopback in the Edit Circuits Window Port Color StateDCC Tunnels VC-12 BandwidthVC Low-order Path Tunnels and Aggregation Points Traditional DCC Tunnels Subnetwork Connection Protection CircuitsIP-Encapsulated Tunnels SDH Layer SDH BytesGo-and-Return Subnetwork Connection Protection Routing Open-Ended Subnetwork Connection Protection CircuitsVcat Circuit States Virtual Concatenated CircuitsVcat Common Fiber Routing Vcat Member RoutingFor CE100T-8 card For CE-MR-6 card Link Capacity AdjustmentCard Circuit Rate Number of Members Vcat Circuit SizeVC3 VC3 VC4Open-Ended Vcat Card Mode Member UtOfGroupSupport Add a Delete aOpen-Ended Vcat Protection Routing Preferences Routing Mode Protection OptionsSection and Path Trace Routing Preferences Routing Mode Protection OptionsPCA DRI J1 or J2 Cards/PortsRolls Window Bridge and RollState Description Roll StatusSingle Destination Roll Single and Dual Rolls11illustrates a dual roll on the same circuit Protected Circuits Merged CircuitsTwo-Circuit Bridge and Roll Server Trails Reconfigured CircuitsVcat Circuit Routing over Server Trails Server Trail Protection TypesShared Resource Link Group Page Management Network Connectivity What to Check IP Networking OverviewIP Addressing Scenarios Scenario 1 CTC and ONS 15310-MA SDH Nodes on the Same Subnet LAN B Scenario 3 Using Proxy ARP SDH Scenario 4 Default Gateway on CTC ComputerScenario 4 Default Gateway on a CTC Computer Scenario 5 Using Static Routes to Connect to LANs271793 Scenario 5 Static Route with Multiple LAN Destinations Scenario 6 Using Ospf8shows a network enabled for Ospf Scenario 7 Provisioning the ONS 15310-MA SDH Proxy Server Scenario 6 Ospf Not EnabledManagement Network Connectivity IP Addressing Scenarios GNE SettingOspf ONS 15310-MA SDH 86.1.1.1 Scenario 7 Proxy Server with ENEs on Multiple Rings OSPF, Icmp Routing TablePackets Arrive At Accepts Rejects Entry Destination Mask Gateway Interface Port Function Action1 External FirewallsPort Function Action 10240-12287 Proxy client 57790 Default TCC listener portIs 683 and the TCC Corba Default is TCC Fixed Open GNE 13 Proxy and Firewall Tunnels for Foreign Terminations 14 Foreign Node Connection to an ENE Ethernet Port TCP/IP and OSI NetworkingOSI Model IP Protocols OSI Protocols IP-OSI Tunnels Point-to-Point ProtocolOSI Connectionless Network Service Link Access Protocol on the D ChannelField Definition Description SEL OSI Routing Intermediate System-to-Intermediate System Protocol End System-to-Intermediate System ProtocolSize bytes Description TarpField Tarp Processing Type Description ProcedureField Abbreviation Size bytes Description PDUProcess General Tarp Flow Default Range Timer Description SecondsTarp Loop Detection Buffer Manual TID to Nsap Provisioning OSI Virtual RoutersManual Tarp Adjacencies EMS IP-over-CLNS TunnelsStep Purpose Provisioning IP-over-CLNS TunnelsIP Over Clns Tunnel Scenario 1 ONS Node to Other Vendor GNE 19 IP Over Clns Tunnel Scenario 1 ONS NE to Other Vender GNE IP-Over-CLNS Tunnel Scenario 2 ONS Node to RouterManagement Network Connectivity TCP/IP and OSI Networking IP-Over-CLNS Tunnel Scenario 2 ONS Node to Router CTC 1 10.10.10.100/24 Tab Actions Provisioning OSI in CTCIPv6 Native Support IPv6 Network CompatibilityIPv6 Node IPv4 Node 1 IPv6 Enabled Mode2 IPv6 Disabled Mode 3 IPv6 in Non-secure Mode FTP Support for ENE Database Backup4 IPv6 in Secure Mode 5 IPv6 LimitationsSubnetwork Connection Protection Configurations SDH Topologies and UpgradesSubnetwork Connection Protection Application Example Subnetwork Connection Protection BandwidthTerminal Point-to-Point and Linear ADM Configurations Subtending Rings InteroperabilityONS 15310-MA SDH Linear ConnectionsPath-Protected Mesh Network for ONS 15310-MA SDH Nodes Path-Protected Mesh NetworksNode Protect traffic Stmn Speed Upgrades Four Node ConfigurationsOverlay Ring Circuits Span Upgrade WizardManual Span Upgrades Overlay Ring Circuit 10-1 Viewing AlarmsRight-click a column and choose Show Column Ref Column Information RecordedColor Description 10-2STM1/STM4 VC Viewing Alarms With Each Node’s Time ZoneTerm Object Electrical Syntax and Examples DS3/E3 VCFiltering Alarms Controlling Alarm DisplayViewing Alarm-Affected Circuits Button/Check box/Tool Action10-5 Conditions TabControlling the Conditions Display Conditions Column Descriptions Retrieving and Displaying ConditionsButton Retrieve FilterFiltering Conditions Viewing HistoryDescription Description of the condition 10-710-8 Retrieving and Displaying Alarm and Condition HistoryHistory Column Descriptions Alarm Profiles Alarm SeveritiesAlarm History and Log Buffer Capacities 10-9Alarm Profile Buttons Creating and Modifying Alarm ProfilesButton Description 10-1010-11 Alarm Profile EditingAlarm Severity Options Applying Alarm Profiles Alarm SuppressionRow Display Options 10-12Alarms Suppressed for Maintenance External Alarms and ControlsAlarms Suppressed by User Command External Alarm Input10-14 External Control Output11-1 Threshold Performance Monitoring11-2 Port Line Path Near End Far EndYES 11-3 Intermediate-Path Performance Monitoring11-4 Performance Monitoring Parameter DefinitionsParameter Definition 11-5 11-6 11-7 MS-ESR One or more errored blocks or at least one defectMS-PSC-S 11-811-9 11-10 11-11 11-12 11-13 Performance Monitoring for Electrical Ports11-14 11.5.1 E1 Port Performance Monitoring Parameters11-15 PM parameters for the E1 ports are listed in TableLine NE 11-16 11.5.2 E3 Port Performance Monitoring ParametersLine NE Path NE 11.5.3 DS3 Port Performance Monitoring ParametersVC4 HP Path NE/FE 11-1711-18 Monitored Signal Types for the DS3 Port11-19 Performance Monitoring for Ethernet CardsLine NE Path NE 1 Path FE 1 11-20 11-21 11-22 MaxBaseRateTime Interval Number of Intervals Displayed 11-23 11-24 11-25 Performance Monitoring for Optical Ports11.7.1 STM1 Port Performance Monitoring Parameters 11-26 MS NE/FE 1+1Lmsp NE 1 PJC NE Path NE/FE4 4 11-27 11.7.2 STM4 Port Performance Monitoring ParametersMS NE/FE 1+1 HP Path VC4 and VC4-XcLmsp NE 1 PJC NE NE/FE4 4 11-2811-29 Monitored Signal Types for the STM16 Ports13 PM Parameter Read Points on the STM16 Ports 11-3011-31 11-32 12-1 Snmp Overview12-2 Snmp Basic ComponentsExample of the Primary Snmp Components 12-3Snmp Message Types Snmp Version SupportSNMPv3 Support 12-4IETF-Standard MIBs for the ONS 15310-MA SDH Snmp Management Information BasesOperation Description Number Module Name Title/Comments12-6 Proprietary ONS 15310-MA SDH MIBs12-7 Number Module Name12-8 CISCO-ENTITY-VENDORTYPE-OID-MI12-9 CISCO-VLAN-IFTABLE-RELATIONSHI12-10 Generic and Ietf Traps Snmp Trap ContentFrom RFC No Trap 12-1112-12 SNMPv1/v2 Community NamesVariable Trap Bindings 12-13 SNMPv3 Proxy ConfigurationSNMPv1/v2 Proxy Support Over Firewalls Ethernet Statistics Group Snmp Remote MonitoringRow Creation in etherStatsTable 12-14Get Requests and GetNext Requests History Control GroupRow Deletion in etherStatsTable 12.10.1.4 64-Bit etherStatsHighCapacity TableRow Creation in historyControlTable Ethernet History Rmon GroupRow Deletion in historyControl Table 12.10.3.1 64-Bit etherHistoryHighCapacityTableAlarm Table Alarm Rmon GroupRow Creation in alarmTable Column Name12-18 Event Rmon Group Row Deletion in alarmTableEvent Table Log Table12-20 Alarm Interface Cisco ONS 15310-MA SDH Shelf SpecificationsUDC Interface ConfigurationsCisco Transport Controller LAN Interface 4 TL1 Craft InterfacePush Buttons LEDsBits Interface System TimingEnvironmental Specifications Power SpecificationsFan-Tray Assembly Specifications Shelf Dimensions1 15310E-CTX-K9 Card Card Specifications3 CE-100T-8 and ML-100T-8 Cards Nonvolatile Memory5 E121E3DS33 and E163E3DS33 Cards CE-MR-6 CardAppendix a Specifications Card Specifications Filler Cards SFP SpecificationsMin/Max dBm Transmitter OutputONS-SE-Z1= STM1ONS-SI-2G-I1 ONS-SE-ZE-ELWavelength Fiber Type Cable Distance Purcell FLX25GT Cabinet Specifications Power Specifications ONS 15310-MA SDH OSP Statements Turn off or on AC power in Purcell FLX25GT OSP cabinet ONS 15310-MA OSP configurationStop. You have completed this procedure State Qualifier Definition Service StatesFault The entity has a raised alarm or condition Administrative StatesSecondary State Definition FLTCard Service State Transitions Service State TransitionsAdministrative State Table B-4lists card service state transitionsTable B-4 ONS 15310-MA SDH Card Service State Transitions Current Service State Action Next Service State Port and Cross-Connect Service State Transitions Current Service State Action Next Service State Current Service State Action Next Service State Current Service State Action Next Service State Current Service State Action Next Service State Current Service State Action Next Service State Current Service State Action Next Service State Pluggable Equipment Service State Transitions Current Service State Action Next Service State Network Element Defaults Description Network Element DefaultsCisco ONS 15310-MA SDH Card Default Settings CTC Default SettingsDefault Name Default DomainConfiguration Defaults Defaults by Card Threshold DefaultsDefault Name Default Value Default Domain 3.1 15310E-CTX-K9 Card Default SettingsTable C-2 15310E-CTX-K9 Card Default Settings Default Name Default Value Default Domain CTX-2500.STM16-PORT.config.line.SendDoNotUse CTX-2500.STM16-PORT.config.line.SendAISOnFacilityLoopbackCTX-2500.STM16-PORT.config.line.SendAISOnTerminalLoopback CTX-2500.STM16-PORT.config.vclo.IPPMEnabled CTX-2500.STM16-PORT.config.vc4.IPPMEnabledDefault Name Default Value Default Domain Default Name Default Value Default Domain CTX-2500.STM4-PORT.config.line.SendAISOnTerminalLoopback CTX-2500.STM4-PORT.config.line.SendAISOnFacilityLoopbackCTX-2500.STM4-PORT.config.line.SendDoNotUse CTX-2500.STM4-PORT.config.vc4.IPPMEnabledDefault Name Default Value Default Domain Default Name Default Value Default Domain E3-PORT DS3-PORT E3-PORT 3.2 E121E3DS33 Card Default SettingsUnframed M13 C BITBPV BIPE1MF E1MF E1CRCMF Unframed E1-21-E3-DS3-3.E1-PORT.config.LineTypeHDB3 E1-21-E3-DS3-3.E1-PORT.config.SendAISVOnDefects E1-21-E3-DS3-3.E1-PORT.config.SendAISOnTerminalLoopbackE1-21-E3-DS3-3.E1-PORT.config.SendDoNotUse E1-21-E3-DS3-3.E1-PORT.config.TreatLOFAsDefectTable C-3 E121E3DS33 Card Default Settings E1-21-E3-DS3-3.E3-PORT.config.SendAISOnTerminalLoopback Table C-4lists the E163E3DS33 card default settings 3.3 E163E3DS33 Card Default SettingsE1-63-E3-DS3-3.DS3-PORT.config.SendAISOnTerminalLoopback E1-63-E3-DS3-3.Broadband.portAssignmentTable C-4 78-19417-01 E1-63-E3-DS3-3.E1-PORT.config.LineType E1-63-E3-DS3-3.E1-PORT.config.LineCodingE1-63-E3-DS3-3.E1-PORT.config.RetimingEnabled E1-63-E3-DS3-3.E1-PORT.config.SendAISOnTerminalLoopbackDefault Name Default Value Default Domain E1-63-E3-DS3-3.E3-PORT.config.SendAISOnTerminalLoopback Default Name Default Value Default Domain Ethernet Card Default Settings ML100T.ios.radiusServerAccess Cisco ONS 15310-MA SDH Node Default Settings78-19417-01 NODE.general.AllowServiceAffectingPortChangeToDisabled NODE.circuits.sncp.SwitchOnPDIPNODE.network.general.AlarmMissingBackplaneLAN NODE.network.general.GatewaySettings None None ENENODE.osi.tarp.LANStormSuppression Aits Aits UitsNODE.osi.tarp.LDB NODE.osi.tarp.PDUsOriginationSupported NotDefault Name NODE.security.passwordAging.EnforcePasswordAging NODE.security.other.PreventInactiveSuperuserDisableNODE.security.serialCraftAccess.EnableCraftPortA NODE.security.serialCraftAccess.EnableCraftPortBHDB3 HDB3 AMI Sets DUSFAS+CAS+ CRC FAS+CAS+CRC FAS+CRCNODE.timing.bits-2.FramingOut NODE.timing.bits-2.CodingOutGMT Greenwich Mean Time Time ZonesGMT Default Value 78-19417-01 78-19417-01 IN-1 IN-2 BitsBits ONS 15310-MA SDH IN-3 ClnsCTC IN-4 DCCIN-5 IN-6 IN-7 Lcas LDPIN-8 MIBIN-9 PCM OSI Clnp ClnsIppm IN-10Dhcp IS-IS LAP-D PpmnRadius IN-11IN-12 Rmon SFPSocks IN-13IN-14 IN-15 UDCTL1 Unix IN-16 See also circuits
Related manuals
Manual 278 pages 31.98 Kb Manual 8 pages 60.19 Kb

15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

The Cisco 15310-CL is a versatile platform that primarily serves as a carrier-class router aimed at supporting high-speed data and voice services. It is built to handle the demands of large enterprises and service providers, offering a robust design that ensures maximum uptime and performance. One of its standout features is its modular architecture, which enables users to customize their configurations based on specific application needs. This scalability allows for future expansion without the need for a complete hardware overhaul.

Key technologies integrated into the Cisco 15310-CL include high-density Ethernet interfaces and a comprehensive suite of Layer 2 and Layer 3 protocol support. The device is capable of supporting multiple types of connections, including TDM, ATM, and Ethernet. This flexibility makes it an ideal choice for organizations that require seamless migration between various service types. Moreover, with features such as MPLS (Multiprotocol Label Switching) support and advanced Quality of Service (QoS) mechanisms, the router ensures that critical applications receive the necessary bandwidth and low latency required for optimal performance.

In contrast, the Cisco 15310-MA focuses on access solutions, providing a cost-effective entry point for businesses looking to enhance their network capabilities. It is well-suited for smaller offices or branch locations that need reliable connectivity without the expense and complexity associated with larger systems. The device supports a range of access methods and provides essential features like firewall capabilities, VPN support, and comprehensive security measures to protect sensitive data.

Both models benefit from Cisco's commitment to security and manageability, offering features like enhanced encryption protocols and user authentication mechanisms that help safeguard networks against threats. Additionally, they can be managed through Cisco’s intuitive software tools, simplifying configuration and monitoring tasks for IT administrators.

The Cisco 15310-CL and 15310-MA are ideal solutions for businesses seeking to enhance their network infrastructure, ensuring firms can keep pace with evolving technology demands while maintaining a focus on security and performance. Their combination of advanced features, modular capabilities, and robust support makes them valuable assets in the networking landscape.