Connection to the ONS 15216 EDFA2 | Cisco Systems guide

F I N A L D R A F T - C I S C O C O N F I D E N T I A L

C H A P T E R 9

TL1 Commands

9.1 Introduction

This chapter provides the details of TL1 commands supported by the Cisco ONS 15216 EDFA2. This

chapter also maps various TL1 command parameters to their SNMP counterpart attributes in the ONS 15216 EDFA2 MIB (CERENT-15216-EDFA-MIB.mib).

9.2 Connection to the ONS 15216 EDFA2

The ONS 15216 EDFA2 system supports up to ten simultaneous Telnet connections via the Ethernet LAN port. TL1 sessions are available on TCP/IP port 3082 for raw TL1 and/or port 3083 for TL1 over Telnet. When connected, the ACT-USERcommand activates a session. (See “Log In via LAN Port Using Telnet (Optional)” section on page 8-3.)

9.3 Explanation of Command Parameters

TL1 messages are grouped into autonomous and non-autonomous types. Autonomous messages are generated as a result of activity on the network elements such as alarms, thresholds, alerts and status information. No request is required in order to receive autonomous messages. Non-autonomous messages consist of a request command and a response from the ONS 15216 EDFA2. Autonomous messages and non-autonomous commands use a common set of parameters. Some of the most common parameters are defined in the following sections.

9.3.1 Source Identifier (sid) and Target Identifier (tid)

The source identifier (sid) or target identifier (tid) parameters uniquely identify an ONS 15216 EDFA2. For the ONS 15216 EDFA2, sid and tid are the same. While the TL1 shell uses the sid/tid name in its command line prompt, the ASH shell uses the host name. The sid/tid name is the same as the sysName in the SNMP MIBs and is displayed in the upper-right of the login screen of the ASH shell.

Cisco ONS 15216 EDFA2 Operations Guide

	78-16033-01	9-1

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Cisco Systems manual Connection to the ONS 15216 EDFA2, Explanation of Command Parameters

Contents

Corporate Headquarters Cisco ONS 15216 EDFA2 Operations Guide Cisco ONS 15216 EDFA2 Operations Guide N T E N T S Rack Installation and Power Supply Connection Procedures Srom cfg ip modify Command Snmp mib get Command Snmp mib list Command Provisioning Using TL1 Introduction Status Information Needed by Cisco TAC Cisco ONS 15216 EDFA2 Temperature Requirement A-25 Eye Damage Warning Xii G U R E S Xiv Gain Range TL1 Commands and Messages Security Permissions Access Levels Table A-1 Xviii Cisco.com Obtaining DocumentationOptical Networking Product Documentation CD-ROM Ordering Documentation Documentation Feedback Obtaining Technical Assistance Cisco TAC Escalation Center Technical Assistance CenterCisco TAC Website Obtaining Additional Publications and Information Bandwidth On Demand Wavelength Protection Switching Wavelength Protection Switching Key Features Gain Flattening Constant Gain Low Noise Transient SuppressionSnmp MIBs 6 TL1 Requirement Specification Optical SpecificationsThere is no input power, the ONS 15216 EDFA2 has DBm of output power. For additional safety Channel Loading Maximum Input PowerMaximum Channel Power ONS 15216 EDFA2 Electrical Specifications Electrical Specifications External Features Mechanical Specifications4lists the ONS 15216 EDFA2 mechanical specifications TR-NWT-000332, Issue 4, Method Front Panel ONS 15216 EDFA2 Dimensions ONS 15216 EDFA2 Front Panel Features Feature DescriptionInformation LAN Placement and Power Connection Standard PrecautionsIntroduction General Rack Considerations Rack Installation and Power Supply Connection Procedures SC/UPC Optical Ports Safety RequirementsOptical Connection Procedure Gain Range Optical Amplification Operation Verification ProcedureGain Total Input Power dBm Total Output Power dBm Alarm Relay Connection Procedure Alarm Out Relay Interface RJ-45Communications Relay Pinout Description Power LED Green Alarm LEDsPower Fail LOS Fail LED Red Serial Interface EIA/TIA-232 Communication Serial Connection ProcedureLOS LED Yellow Ethernet Socket LEDs HyperTerminal Connect To Dialog Box Click Settings -5 on page 3-10 and click Ascii Setup Optical Amplifier Properties Dialog Box Settings Tab Remote Communication Component Requirements Serial Interface Remote Communication via ModemComponent Communication Component List Modem Power Up Modem SignalsModem Configuration Settings Up U or Down D Description Modem Setting Description Setting and Saving Modem Settings PC Connection via Modem LAN Interface Ethernet LAN Connection Procedure N a L D R a F T C I S C O C O N F I D E N T I a L Following sections describe these steps in detail Provisioning Using ASH and Snmp Example 4-1 ASH Shell Login Window Then enter the following command at the hostname promptExample 4-2 ASH Shell Login Response SidtidnameONS15216 EDFA2 ED-NE-GEN123CLI=ASH Set IP Address Log In via LAN Port Using Telnet Optional Set Date and Time Set Power Bus Mode Simplex or DuplexVerify Amplifier Operational Status You are now connected to the ONS 15216 EDFA2 via Telnet Set Gain Set Alarm ThresholdsExample 4-7 Setting the Gain Class CERENT-15216-EDFA-MIB.cerent15216EdfaCfgGroup = Example 4-8 Displaying the Alarm Thresholds Alarm Threshold Attribute Definitions N a L D R a F T C I S C O C O N F I D E N T I a L N a L D R a F T C I S C O C O N F I D E N T I a L Example 4-9 Changing Current User’s Password Set Password Save Changes Add UsersExample 4-10 Adding a New User Example 4-11 Saving Changes Log Off Back Up System ConfigurationSystem responds with progress information Example 4-12 Logging Off Save the changes Restore System ConfigurationReboot the ONS 15216 EDFA2 At the hostname prompt, enter the following command Recover Default Password Snmp Components Snmp Overview Snmp Agent ONS 15216 EDFA2 Snmp ElementsSnmp MIB Snmp manager Snmp elements are shown in Figure Snmp Manager Snmp MIBs and Message TypesSnmp MIB Example 5-1 snmp Command Followed by the Tab Key Command Syntax Using the Snmp AgentOperation Description Snmp Operation Types Default Community Strings Community String Default PrivilegesExample 5-2 snmp table display Command Creating a View CommandSet View Entry Snmp row set local cerent15216EdfaViewEntry Creating a Community Entry Data Prompt Command DescriptionSet CommunityEntry Snmp row set local cerent15216EdfaCommunityEntry Creating a Community Entry 4displays the definitions for the community entry valuesData Prompt Description Display CommunityEntry Example 5-5 cerent15216EdfaCommunityEntry Display CommandSnmp row display local cerent15216EdfaCommunityEntry Snmp Operation Decimal Values Setup for CTM Access Tables and Groups Cerent15216EdfaCfgGroup Variable Descriptions Maximum Variable Syntax Access DescriptionCfgGroup Table N a L D R a F T C I S C O C O N F I D E N T I a L Cerent15216EdfaPumpCfgEntry Variable Descriptions Changing the Pump Control ModePumpCfgEntry Table 200 Changing the Pump Control Value OverallStatusGroup Table Example 5-7 Changing Value for Constant Pump Current Mode Cerent15216EdfaOverallStatusGroup Variable Descriptions PumpStatusEntry Table OverallControl TableCerent15216EdfaOverallControl Variable Descriptions 10 cerent15216EdfaPumpStatusEntry Variable Descriptions 11 cerent15216EdfaAlarmEntry Variable Descriptions AlarmEntry Table 12 cerent15216EdfaOpGroup Variable Descriptions OpGroup Table 13 cerent15216EdfaVersionGroup Variable Descriptions Setting Up TrapsVersionGroup Table Notification MIB Items Description Display Trap CommandSnmp table display local cerent15216EdfaCommTrapEntry Displays the communities for traps. See Example Set Agent Trap Enable Set Trap CommandSnmp attribute set local cerent15216EdfaAgentTrapEnable Example 5-9 cerent15216EdfaCommTrapEntry Set Command Snmp attribute get local cerent15216EdfaAgentTrapEnable Get Agent Trap EnableRetrieving Information IP Address Date and Time 16describes the attributes displayed by these commandsAttribute Description Snmp attribute get local cerent15216EdfaRtcDateAndTime Example 5-12 cerent15216EdfaOverallControl Display Command Power Gain16 cerent15216EdfaRtcDateAndTime Command Attributes Case Temperature Value Case TemperatureCase Temperature Alarm Threshold Example 5-13 cerent15216EdfaPumpStatusEntry Display Command Example 5-14 cerent15216EdfaCfgGroup Display Command Case Temperature Alarm HysteresisSnmp attribute get local cerent15216EdfaCtmpMax Snmp attribute get local cerent15216EdfaCtmpMaxHysteresis Power Bus Alarm Threshold Power BusPower Bus Mode Input Power Signal Value Input Power SignalSnmp attribute get local cerent15216EdfaInPoweruW Snmp attribute get local cerent15216EdfaInPowerdBm Loss of Signal Input Power Alarm Threshold Output PowerLoss of Signal Input Power Alarm Hysteresis Output Power Value Displays output power value in milliwatts Loss of Output Power Alarm SetpointSnmp attribute get local cerent15216EdfaOutPowerdBm Snmp attribute get local cerent15216EdfaLpoutSetpoint Snmp attribute get local cerent15216EdfaLpoutDeviation Example 5-15 cerent15216EdfaLpoutDeviation Set Command Snmp attribute get local cerent15216EdfaLpoutHysteresis Database Backup and RestoreLoss of Output Power Alarm Hysteresis Database Restore Procedure Database Backup Procedure Example 5-16 cerent15216EdfaAlarmEntry Display Command Alarm EntrySnmp table display local cerent15216EdfaAlarmEntry 17summarizes the ONS 15216 EDFA2 Snmp alarms Summary of Snmp AlarmsAlarm Index Alarm ID Description Priority 17 Snmp Alarms N a L D R a F T C I S C O C O N F I D E N T I a L Command Description User Access LevelsASH Commands Security Permissions Access Levels Clear Clears the shell screen Yes Help Gives help about commands Yes Gain gain modify Modifies gain setting YesLogin Allows the user to log into shell Yes History Displays the history list Yes Shell more disable Disables more Yes Restore system Restores configuration from backup file YesShell more enable Enables more Yes Network host ftp FTPs to remote host Yes Snmp mib get Gets a MIB Yes Snmp attribute set Sets an attribute YesSnmp mib list Lists a MIB Yes Snmp row get Gets a row Yes User entry create Creates a new user Yes Srom cfg ip modify Modifies the serial ROM IP contents YesUser entry delete Deletes the user Yes User entry edit Edits an existing user entry Yes Srom cfg boot display Command Configuration CommandsSrom cfg boot display Syntax Description srom cfg boot display Srom cfg ip display Command Srom cfg boot modify CommandSrom cfg boot modify Syntax Description srom cfg boot modify Pdm busmode display Command Srom cfg ip modify CommandSrom cfg ip modify Pdm busmode display Pdm cfg threshold bus display Command Pdm busmode modify CommandPdm cfg threshold bus modify Command Gain gain display Command Gain gain modify Command Administrative CommandsVoa power input display Command Syntax Description Exit Command Clear CommandHelp Command History Command Processor reset Command Shell CommandsLogin and logoff Commands Shell more enable and disable Commands Shell lines set CommandShell status display Command Shell type modify Command Ffs file list Command Flash File System CommandsExample 6-12 ffs file list Command Syntax Description shell type modify tl1 ash Snmp attribute get Command Snmp CommandsAccesses and displays a specific MIB attribute. See Example Example 6-13 snmp attribute get Command Example 6-14 snmp attribute get Command List Snmp attribute list CommandExample 6-15 snmp attribute list Command Snmp attribute list Snmp mib display Command Snmp attribute set CommandSnmp attribute set Snmp mib display Snmp mib list Command Snmp mib get CommandSnmp mib get Syntax Description snmp mib get IPaddress local Snmp row display Example 6-19 snmp row display Command Snmp row set Command Snmp row get CommandSnmp row get Snmp row set Snmp subtree get Command Snmp subtree display Command Example 6-24 snmp subtree list Command Snmp subtree list CommandSnmp subtree list Syntax Description snmp subtree list IPaddress local Example 6-25 snmp table display Command Snmp table display CommandSnmp table display Snmp table display IPaddress local Snmp table list Command Snmp table get CommandSnmp table get Syntax Description snmp table get IPaddress local table Snmp tree attribute list Command User CommandsExample 6-28 snmp tree attribute list Command Snmp tree attribute list User entry edit Command User entry create CommandSyntax Description user entry create name usermode Syntax Description user entry edit username User file display and user name display Commands User entry delete CommandUser entry delete Syntax Description user entry delete username User passwd set Command User inactivity modify and user inactivity display CommandsCommand to display the current inactivity values User inactivity modify or user inactivity display User active message send Command User active list Command Snmp table display local entPhysicalEntry Command Manufacturing Information Access CommandsSnmp table display local entPhysicalEntry Displays the entity information. See Example Backup system Command Restore CommandsRestore system Command Syntax Description backup system filename Manufacturer restore defaults all Command Manufacturer ModeManufacturer restore defaults passwords Command To start an FTP session, use the following command FTP Command LineWhen prompted, enter the FTP user password as shown Example of FTP from a Remote Server Ftp type At the ftp prompt, enter the following commandExample of FTP to a Remote Server Example 7-1 FTP Help Command FTP Commands N a L D R a F T C I S C O C O N F I D E N T I a L Provisioning Using TL1 Example 8-1 TL1 Shell Login Prompt Then enter the following command at the ASH hostname promptExample 8-2 TL1 Shell Login Response SidtidnameONS15216 EDFA2 ACT-USERCISCO15100 SidtidnameONS15216 EDFA2 INIT-SYSALL1021 255.0,DEFRTR=192.167.3.20 Example 8-4 Setting the Date and Time Using TL1 Example 8-6displays sample output of this commandExample 8-5 Setting the Power Bus Mode Using TL1 Pwrbusmode value can be Simplex or DUPLEX. See Example SidtidnameONS15216 EDFA2 ED-DWDMALL123OVERALLGAIN=200 Example 8-7 Setting the Gain Using TL1 Example 8-8 Displaying the Alarm Thresholds Using TL1 Example 8-8shows sample command outputsSidtidnameONS15216 EDFA2 RTRV-TH-DWDMALL124 SidtidnameONS15216 EDFA2 RTRV-TH-EQPTALL125 Losth Lpoutdev LoshystLpouthyst Lpoutsetpt Minctmp MaxctmpMaxctmphyst SidtidnameONS15216 EDFA2 ED-PIDCISCO15130OLDPW,NEWPW Example 8-9 Changing Current User’s Password Using TL1Minctmphyst Example 8-11 Logging Off Using TL1 Example 8-10 Adding a New User Using TL1SidtidnameONS15216 EDFA2 ENT-USER-SECUjsmith140jspasswd,,RW SidtidnameONS15216 EDFA2 CANC-USERCISCO15150 SidtidnameONS15216 EDFA2 INIT-SYSALL1241 Source Identifier sid and Target Identifier tid Explanation of Command ParametersConnection to the ONS 15216 EDFA2 Access Identifier aid Command Code Modifier ccmNotation Correlation Tag ctag Symbol Meaning Description Summary of Autonomous Alarms and Messages Rept EVT Dwdm CTRLMODE1 Rept EVT Eqpt CutoverresetRept EVT Dwdm CTRLMODE2 Rept EVT Dwdm Gainchgd On page 9-5summarizes the ONS 15216 EDFA2 clear alarms Software ResetNew Software Load File Transfer ALW-MSG-ALL ACT-USERApply CANC-USER Rept ALM ENV Rept ALM DwdmRept EVT Dwdm Rept EVT ENV RTRV-HDR RTRV-ENVRTRV-INV RTRV-NE-GEN CommandACT-USER TL1 Commands and Autonomous MessagesACT-USER ALW-MSG-ALL Powerbusb Powerbusa CommandAPPLY SoftwareresetApply Softwareload CommandCOPY-RFILE CommandCANC-USERCANC-USER COPY-RFILE Ath Ftp//useridpassword@ftphostport/urlpFile//localhost/urlpath Cwd1/cwd2/…/cwdn/filename CPY-MEM CommandCPY-MEMCFG LOG DLT-RFILE CommandDLT-RFILEDbcfg MEM CommandED-DAT CommandDLT-USER-SECUDLT-USER-SECU ED-DAT ED-DWDM CommandED-DWDM ED-ENV CommandED-ENVAid PWR-A, PWR-B, and ALL have same input effect ED-NE-GEN CommandED-NE-GEN ED-PID CommandED-PIDTL1 ASH CommandENT-USER-SECU CommandED-USER-SECUED-USER-SECU ENT-USER-SECU Permissions CommandINH-MSG-ALLINH-MSG-ALL LOS Gainchgd INIT-SYS CommandINIT-SYSRept ALM Dwdm Eqpt ALL Loss of Output Power alarm cerent15216EdfaAlarmLpout Gain Out of Range alarm cerent15216EdfaAlarmGainNon-service affecting 25 Rept ALM Dwdm Syntax Description Date Yyyy-mm-dd Date of origination of TL1 message Rept ALM ENVExample 9-21 Rept ALM ENV Message 26 Rept ALM ENV Syntax Description Example 9-22 Rept ALM Eqpt Message Rept ALM Eqpt 27 Rept ALM Eqpt Syntax Description Affecting optical signal or power busGeneral parameters of the ONS 15216 EDFA2 not directly Rept EVT Dwdm / Rept EVT ENV / Rept EVT Eqpt Reports autonomous events. Reports when an event is loggedTime Hhmmss Time of origination of TL1 message Rept EVT Dwdm or Rept EVT ENV or Rept EVT Eqpt EVN Rept EVT Fxfr Eqpt Softwarereset RTRV-ALM-ALL CommandRTRV-ALM-ALL Dwdm Lpout Example 9-25 RTRV-ALM-ALL Command and ResponseDwdm Ctmp 30 RTRV-ALM-ALL Syntax Description Generates a report on active Dwdm alarms CommandRTRV-ALM-DWDMExample 9-26 RTRV-ALM-DWDM Command and Response RTRV-ALM-DWDM 31 RTRV-ALM-DWDM Syntax Description Example 9-27 RTRV-ALM-ENV Command and Response CommandRTRV-ALM-ENVRTRV-ALM-ENV 32 RTRV-ALM-ENV Syntax Description Example 9-28 RTRV-ALM-EQPT Command and Response CommandRTRV-ALM-EQPTRTRV-ALM-EQPT Aid Eqpt and ALL have same input effect Ctmp RTRV-AO CommandRTRV-AOALM EVT Example 9-30 RTRV-COND-ALL Command and Response CommandRTRV-COND-ALLRTRV-COND-ALL 35 RTRV-COND-ALL Syntax Description LOS Generates a report on the condition state of Dwdm alarms CommandRTRV-COND-DWDMExample 9-31 RTRV-COND-DWDM Command and Response RTRV-COND-DWDM Example 9-32 RTRV-COND-ENV Command and Response CommandRTRV-COND-ENVRTRV-COND-ENV Amp01ONS15216 EDFA2 RTRV-COND-ENVAmp01ALL229PWRBUSA 37 RTRV-COND-ENV Syntax Description Generates a report on the condition state of general alarms CommandRTRV-COND-EQPTExample 9-33 RTRV-COND-EQPT Command and Response RTRV-COND-EQPT Retrieves the timeout values for user access levels CommandRTRV-DFLT-SECUExample 9-34 RTRV-DFLT-SECU Command and Response RTRV-DFLT-SECU CommandRTRV-DWDM Timeout Integer Timeout in minutesRetrieves the ONS 15216 EDFA2 optical control configuration RTRV-DWDM 40 RTRV-DWDM Syntax Description ConstOutputPower. a valid mode only for pumpIdle Overallgain CommandRTRV-ENVRTRV-ENV CommandRTRV-INV CommandRTRV-HDRRTRV-HDR RTRV-INV 43 RTRV-INV Syntax Description CommandRTRV-NE-GENRTRV-NE-GEN Aid Always Eqpt Example 9-39 RTRV-NE-GEN Command and Response44 RTRV-NE-GEN Syntax Description Amp01ONS15216 EDFA2 RTRV-NE-GENAmp01123 Example 9-40 RTRV-RFILE Command and Response List all Files CommandRTRV-RFILERTRV-RFILE 45 RTRV-RFILE Syntax Description Example 9-42 RTRV-TH-DWDM Command and Response CommandRTRV-TH-DWDMRTRV-TH-DWDM 46 RTRV-TH-DWDM Syntax Description RTRV-TH-ENV CommandRTRV-TH-ENV RTRV-TH-EQPT CommandRTRV-TH-EQPTPwrbusmin Pwrbusmax Thresholdvalue can be between 20 and 70, with default of 65 Maximum case temperature cerent15216EdfaCtmpMaxMaximum case temperature hysteresis Thresholdvalue can be between 0 and 10, with default of 1, RTRV-TOD CommandRTRV-TOD CommandSET-ATTR-SECUDFLT CommandRTRV-USER-SECURTRV-USER-SECU SET-ATTR-SECUDFLT CommandSET-TH-DWDM 9-6 for access level permissionsSET-TH-DWDM Sets optical threshold values for the ONS 15216 EDFA2 SET-TH-ENV CommandSET-TH-ENV SET-TH-EQPT CommandSET-TH-EQPT CommandSTA-LOCL-RST Thresholdvalue can be between 20 and 70, with defaultExample 9-51 STA-LOCL-RST Command STA-LOCL-RST Troubleshooting Front panel of the ONS 15216 EDFA2 has five LEDs Alarm IndicatorsLEDs and Office Alarms 10-3 LOS Loss of Signal Alarm Optical AlarmsGain Gain Out of Range Alarm LOS Gain Lpout Lpout Loss of Output Power Alarm Ctmp Case Temperature Out of Range Alarm Equipment AlarmsLCRNT1 and LCRNT2 Excessive Pump Current Alarms LTMP1 and LTMP2 Excessive Pump Temperature Alarms Environmental Alarms Troubleshooting Typical ScenariosNo Output Power after Adjusting Gain Settings Pwrbusa and Pwrbusb Power Bus Alarms Image File Download Incomplete 10.2.2 2.0.1 to 2.2.1 Upgrade AttemptBoot Up Failure Hostnameedfaboot% srom cfg boot display Hostnameedfaboot% ffs file listNo Response from RS-232 Port No Response from LAN Port Lost Password Status Information Needed by Cisco TAC 10-12 Discipline Standard Description Regulatory ComplianceEMC ACA AS/NZS3548 Translated Safety Warnings Safety warnings contained in this document are N a L D R a F T C I S C O C O N F I D E N T I a L N a L D R a F T C I S C O C O N F I D E N T I a L DC Power Supply Warning Power Cord Warning Installation Warning No On/Off Switch Warning Selv Circuit Warning Laser Radiation Warning Laser Beam Warning Power Cabling Warning Grounded Equipment Warning Ground Connection Warning Jewelry Removal Warning Supply Circuit Warning Qualified Personnel Warning Power Supply Wiring Warning Invisible Laser Radiation Warning Incorrect Connection Warning Ground Conductor Warning Voltages on DC-input Power Supply Terminals Cisco ONS 15216 EDFA2 Rack Installation More Than One Power Supply Exposed DC Power Wire Warning VDC Power System Chassis Power Connection Cisco ONS 15216 EDFA2 Temperature Requirement N a L D R a F T C I S C O C O N F I D E N T I a L Cisco ONS 15216 EDFA2 Power Circuit Overload Warning Product Disposal Warning Energy Hazard Unit Grounding Protection Warning DC Power Disconnection Warning Ground Wire Warning N a L D R a F T C I S C O C O N F I D E N T I a L N a L D R a F T C I S C O C O N F I D E N T I a L Class B EMC Warning Safety Requirements Warning Laser Radiation Warning Fiber Disconnect Sequence Warning Optical Connector Disconnect Warning Optical Connector Warning Eye Damage Warning Static Electricity Warning Connector Cleaning Warning Cable Connection Sequence Warning Module Removal Warning DC Power Selv Requirement Warning Reinforced Insulation Warning DC Power Supply Connection Warning Power Supply Voltage Warning N a L D R a F T C I S C O C O N F I D E N T I a L N a L D R a F T C I S C O C O N F I D E N T I a L Snmp ASH TL1 ACT-USER Flash file system commands Electrical specifications EntPhysicalEntryFront panel LEDs FTP commands Ctag Default recovery Pdm busmode display Pdm busmode modify Maxctmp Maxctmphyst mechanical specifications 2-4MIBs Rept ALM Dwdm Rept ALM ENV Rept ALM Eqpt Rept EVT Dwdm Remote communications MIB SET-TH-ENV SET-TH-EQPT STA-LOCL-RST User active list User active message send 6-29user commands IN-7 IN-8