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D-4   SmartSwitch 9A100 User Guide

  Acronyms

F

G

H

I

FCS

Frame Check Sequence

FIFO

First In First Out

FTP

File Transfer Protocol

GB/S

Gigabits per second

GCAC

Generic Call Admission Control

GCRA

Generic Cell Rate Algorithm

GFC

Generic Flow Control

HEC

Header Error Check

IEEE

Institute of Electrical and Electronic Engineers

ICMP

Internet Control Message Protocol

ID

Identification Number

IE

Information Element

IETF

Internet Engineering Task Force

IISP

Interim Inter-Switch Signaling Protocol

Summary of Contents for SmartSwitch 9A100

Page 1: ...SmartSwitch 9A100 User Guide 35 Industrial Way Rochester NH 03866 USA 603 332 9400 Part Number 04 0049 01 Rev A Order Number 9032628...

Page 2: ...SING OUT OF OR RELATED TO THIS MANUAL OR THE INFORMATION CONTAINED IN IT EVEN IF CABLETRON SYSTEMS HAS BEEN ADVISED OF KNOWN OR SHOULD HAVE KNOWN THE POSSIBILITY OF SUCH DAMAGES Copyright 1998 by Cabl...

Page 3: ...v i VV Vi i V 2 i 5 i V i v i vi i Vi V V i v i i i i i i V i i vi i Vi V V i i i Li i i V iV i i vi i Vi i i i 2p F i v V i i Vi V i i i i L i i L i v V Vi V i i i i i i i DOC CLASS A NOTICE This di...

Page 4: ...y Berkshire RG13 2PZ England Conformance to Directive s Product Standards EC Directive 89 336 EEC EC Directive 73 23 EEC EN 55022 EN 50082 1 EN 60950 Equipment Type Environment Networking Equipment fo...

Page 5: ...U CENELEC EN 60825 European Committee for Electrotechnical Standardization When operating within their performance limitations laser transceiver output meets the Class 1 accessible emission limit of a...

Page 6: ...ronics p n ES1270 or equivalent U Using a fiber port cleaning swab Alcoa Fujikura LTS p n ACT 01 or equivalent saturated with optical grade isopropyl alcohol gently wipe the end surface of ferrules fi...

Page 7: ...SUMMARY SAFETY The SmartSwitch 9A100 meets the safety requirements of UL 1950 CSA C22 2 No 950 EN 60950 IEC 950 and 73 23 EEC EMC The SmartSwitch 9A100 meets the EMC requirements of FCC Part 15 EN 550...

Page 8: ...Document Name SmartSwitch 9A100 User Guide Document Part Number 04 0049 01 Rev A Document Order number 9032628 Author Carre Gibson Editor Ayesha Maqsood Illustrator Michael Fornalski Date Revision Des...

Page 9: ...r 2 12 2 6 1 Installation Steps 2 14 2 6 2 Starting SmartSwitch ATM Administrator the First Time 2 15 2 6 3 Accessing Online Help 2 15 3 IP Over ATM and LANE 3 1 3 1 Creating an IP over ATM VLAN 3 1 3...

Page 10: ...re Dumps 4 30 5 Troubleshooting 5 1 5 1 Troubleshooting IP over ATM 5 1 5 2 Troubleshooting LAN Emulation 5 2 5 3 Troubleshooting PNNI Links 5 3 5 4 Troubleshooting Congestion 5 4 5 4 1 Diagnosing Con...

Page 11: ...Switch 9A100 User Guide xi TABLE OF CONTENTS C 3 Electronic Services C 1 C 4 Placing A Support Call C 1 C 5 Hardware Warranty C 2 C 6 Software Warranty C 2 C 7 Repair Services C 2 D Acronyms D 1 Index...

Page 12: ...xii SmartSwitch 9A100 User Guide TABLE OF CONTENTS...

Page 13: ...2 13 Figure 4 1 IISP route across PNNI domain 4 4 Figure 4 2 Routes needed for a second IISP switch 4 4 Figure 4 3 IP routing through SW1 for connectivity to the Ethernet network 4 9 Figure 4 4 Memor...

Page 14: ...xiv SmartSwitch 9A100 User Guide List of Figures...

Page 15: ...explanation 4 18 Table 4 3 Settings for QoS queues 4 22 Table 4 4 Boot load commands 4 24 Table A 1 Front panel LEDs A 1 Table A 2 Hardware specifications A 3 Table A 3 Physical specifications A 3 Tab...

Page 16: ...xvi SmartSwitch 9A100 User Guide List of Tables...

Page 17: ...SmartSwitch 9A100 switch By performing the steps described in the first two chapters of this manual your switch will be physically installed accessible on your Ethernet network and running either an I...

Page 18: ...1 2 SmartSwitch 9A100 User Guide Introduction...

Page 19: ...ping box Carefully remove the switch from its packing material 2 1 1 Check Accessory Carton Contents Open the accessory carton and check that it contains the following items 7 foot UTP cable terminate...

Page 20: ...ordered your switch looks similar to the unit in Figure 2 1 The SmartSwitch 9A100 04 has four I O modules Figure 2 1 SmartSwitch 9A100 04 front panel Inspect the switch and make certain that its confi...

Page 21: ...IOM 21 4 155 Mbps OC 3 STM 1 MMF SC 4 ports 6A IOM 22 4 155 Mbps STS 3c STM 1 UTP 5 RJ 45 4 ports 6A IOM 29 4 155 Mbps OC 3 STM 1 SMF IR SC 1 port MMF SC 3 ports 6A IOM 29 4 IR 155 Mbps OC 3 STM 1 SM...

Page 22: ...n the chassis the switch module recognizes only one of them However the redundant power supply feature performs correctly if one power supply fails the other one takes over Follow the instructions bel...

Page 23: ...SmartSwitch 9A100 User Guide 2 5 Switch Installation and Setup InstallingtheSwitch Figure 2 2 Installing the SmartSwitch 9A100 Rotate ejector to lock in place Metal Backpanel Card Guides Circuit Card...

Page 24: ...n software to perform initial switch configuration Configure dumb terminals or PCs running emulation software with the following communication parameters U Baud rate 9600 U Data bits 8 U Stop bits 1 U...

Page 25: ...100 the module emits a series of diagnostic messages If you inserted the module into a chassis that was turned off turn it on now the diagnostics will appear after a 6 second delay If you inserted the...

Page 26: ...nc password admin admin is the default password The current user is Administrator Could not find setup file Running Setup Automatically SwitchName My_9A100 a switch name IPAddress 0 0 0 0 210 160 77 2...

Page 27: ...assigned values for example flush a route table alias Create easier names for often used commands and their parameters Entering parameters at the command line is optional If a command requires paramet...

Page 28: ...U private uni31 STS 3c MMF S 155 MB UP C1 private autoConfig STS 3c SMF I 155 MB DOWN C2 private autoConfig STS 3c MMF S 155 MB DOWN C3 private autoConfig STS 3c MMF S 155 MB DOWN C4 private autoConfi...

Page 29: ...ot unique the console displays a numbered list of possible matching commands For example entering show pnnin is ambiguous because there are several commands that start with pnnin In response the Smart...

Page 30: ...nt Number 0 127 LanName Name of the ELAN to join ServerType Type of LANE Server LECS LES ServerAddress ATM Address of the LANE Server IPAddress IP Address of the Client NetMask IP Netmask of the Clien...

Page 31: ...s that are not available from the console interface U Use a graphical interface U Perform drag and drop operations U Manage all switches from one console U Perform transactions across multiple switche...

Page 32: ...rive a or note the network path to the directory that contains the SmartSwitch ATM Administrator files Start the installation software NT 4 0 or Win95 click Start then click Run NT 3 51 select the Fil...

Page 33: ...ton or press Enter The password is case sensitive T The SmartSwitch ATM Administrator window appears On the Applications menu select User Management 2 6 3 Accessing Online Help All SmartSwitch ATM Adm...

Page 34: ...2 16 SmartSwitch 9A100 User Guide SmartSwitch ATM Administrator Switch Installation and Setup...

Page 35: ...ther through the terminal port or through the Ethernet interface by telnet 2 Create a client on the switch and assign it as the ARP server for the VLAN SmartSwitch add ipatmclient ClientNumber 0 1 Ser...

Page 36: ...VLAN members 5 Configure the ATM interface or adapter for end nodes and edge devices Typically configuration consists of designating IP over ATM as the protocol assigning the device an IP address and...

Page 37: ...e if the switch s MAC address is 00 20 D4 14 41 80 and the switch s client IP address is 90 1 1 1 then the 20 byte ATM address of the ARP server is 39 00 00 00 00 00 00 00 00 00 14 41 80 00 00 5A 01 0...

Page 38: ...AN001 Marketing ELAN name is Marketing not the default ELAN001 ServerType LECS ServerAddress No LANE server address is specified see note below IPAddress 90 1 1 1 IP address and subnet mask are includ...

Page 39: ...ter for all end nodes and edge devices Typically configuration consists of specifying LAN Emulation as the protocol assigning the device an IP address that corresponds to the subnet of the switch s cl...

Page 40: ...sses the byte that corresponds to the last byte of the MAC address is summed with the ELAN number For example the ATM address of the LESs on ELAN000 ELAN001 and ELAN010 are LES for ELAN000 39 00 00 00...

Page 41: ...lf cannot be made unless the phone company has its own number and connection on its own phone system Similarly VLAN membership and the reachability of a SmartSwitch 9A100 on any particular VLAN depend...

Page 42: ...3 8 SmartSwitch 9A100 User Guide F amV m h d F 2 6 3 F 1 m 2...

Page 43: ...n files It does not back up an image of the operating software To perform a back up or restore you must have TFTP server software running on an end station that s reachable by the SmartSwitch 9A100 Th...

Page 44: ...rposes of interoperability however the SmartSwitch 9A100 also supports these additional ATM routing protocols IISP Use to connect with devices that do not support PNNI UNI Use to connect end stations...

Page 45: ...Route No 7 6 Create a route on the IISP device that refers to the net prefix 39 00 00 00 00 00 00 00 00 00 14 41 80 of port b2 on the SmartSwitch 9A100 Note For IISP routes to work with certain devic...

Page 46: ...across PNNI domain A second IISP device Switch D is added behind Switch A If Switch D also needs to reach Switch C for LECS support you must define additional IISP routes between Switches D and C B an...

Page 47: ...TM address SmartSwitch add atmroute PortNumber A1 a2 AtmAddress 39 00 00 00 00 00 00 00 00 00 14 59 00 00 11 22 33 44 55 00 PrefixLength 152 Index 0 Type Internal Scope 0 MetricsTag 0 SmartSwitch 4 En...

Page 48: ...e Service Category administrative weight of 200 Max Cell Rate of 1000 cells per second and an Available Cell Rate of 750 cells per second First we create the outgoing member of the metric pair SmartSw...

Page 49: ...fines its desirability to the PNNI routing service with regard to computing a path to a particular location The lower the administrative weight the more desirable the route For example a route with ad...

Page 50: ...ulated LAN To reach SW2 with the Ethernet based NMS create an IP route that assigns SW1 s switch client as SW2 s default gateway to the network 128 205 99 0 Enter the following on SW2 see Figure 4 3 S...

Page 51: ...e following categories Critical Impacts the entire switch leaving the system unavailable or in a degraded state Major Impacts a feature of the switch leaving the feature unavailable or in a degraded s...

Page 52: ...ber The index number of the event in the circular buffer Event ID A unique ID assigned to the event Time Time of event in switch up time in hours minutes seconds and milliseconds Category Whether this...

Page 53: ...artSwitch 9A100 console Use the set AlarmDisplay command to display alarms on the console as they occur SmartSwitch set alarmdisplay alarmDisplay OFF on SmartSwitch 4 4 3 Deleting Events and Alarms To...

Page 54: ...raff Desc QoS Peak Cell Rate Sust Cell Rate Max Burst Size Aal Type Type Kb s Kb s Kb s Type CLP_0 CLP_0 1 CLP_0 CLP_0 1 CLP_0 CLP_0 1 2 CBR 2 1 0 100 0 0 0 0 5 176 NRTVBR 2 1 0 1585 0 0 0 0 5 SmartSw...

Page 55: ...CLP0 0 MBSCLP01 0 MBSCLP0 0 QOSCLASS 0 AalType 5 md1 However on a point to multipoint connection there should be no traffic in the backward direction so we define the backward traffic descriptor with...

Page 56: ...9A100 local client through a point to point PVC 1 Use add pvc to create the PVC SmartSwitch add pvc ConnType PTP we use a point to point PVC LowPortID a1 for this example we connect through port a1 Lo...

Page 57: ...ng a PVC If the VPI and VCI values do not fit one of the indexed combinations the SmartSwitch 9A100 uses the closest matching indexed combination If you need to use values for VPI and VCI that do not...

Page 58: ...see the change to port A1 SmartSwitch show portconfig a1 Port A1 Parameter Configured Current Sig Type autoConfig pnni10 Sig Role other symmetric Interface Type private private Max vpi bits 3 0 VPI on...

Page 59: ...ion Call Admission Control CAC policies The service category for a connection Buffer memory allocation Threshold settings for anti congestion routines Caution Do not change traffic control settings un...

Page 60: ...traffic descriptors for user defined PVCs All traffic descriptors used to define PVCs must be created by the user The Descriptor Type parameter in the example above corresponds to the traffic descript...

Page 61: ...ard and backward traffic 4 6 2 Call Admission Control Policy Call Admission Control CAC policy defines the bandwidth allocation scheme used by the CAC when setting up connections The SmartSwitch 9A100...

Page 62: ...CON CON CON LIB CON D3 0 CON CON CON LIB CON D4 0 CON CON CON LIB CON SmartSwitch If there are a large number of connections of a particular QoS on a particular port and these connections begin to slo...

Page 63: ...on a per queue per port basis and are measured in cells 53 bytes The Min threshold is the amount of buffer space guaranteed to a call of a particular QoS on the corresponding port The Max threshold i...

Page 64: ...eshold 4096 cells Queue 2 EFCI Threshold 4096 cells Queue 3 EFCI Threshold 4096 cells Queue 4 EFCI Threshold 4096 cells Low EPD Threshold 10922 cells High EPD Threshold 21845 cells Switch Discard Thre...

Page 65: ...e is the default copy Clear all configurations stored within the flash file system Check boot load firmware version numbers Load switch firmware upgrades Set whether power on system tests POST are aut...

Page 66: ...ether POST is set to run at switch start up none df Download Software Downloads software images from a TFTP Bootp server Different components of the switch software are downloaded depending on the par...

Page 67: ...ation 2 Connect both the TFTP Bootp server and the SmartSwitch 9A100 to your Ethernet network Make sure that the TFTP Bootp server can be reached by the SmartSwitch 9A100 Ethernet interface 3 Connect...

Page 68: ...ges boot ima Using TFTP to get bootfile c tftpboot boot boot ima Validity checks of the Boot Load Software Downloaded file All Validity checks OK Programming downloaded image into Boot Load Software1...

Page 69: ...ion 2 Connect both the TFTP Bootp server and the SmartSwitch 9A100 to your Ethernet network Make sure that the TFTP Bootp server can be reached by the SmartSwitch 9A100 Ethernet interface 3 Connect a...

Page 70: ...rnet interface 3 Connect a dumb terminal or PC running terminal emulation software to the SmartSwitch 9A100 Terminal port 4 Copy the SmartSwitch 9A100 switch operating software image into the appropri...

Page 71: ...software Often this directory is tftpboot However it may be different with your TFTP server software The following is an example of a hot upgrade SmartSwitch update firmware ServerIP 214 95 77 240 Pat...

Page 72: ...he following message appears Press any key to exit to boot load prompt stop the countdown by pressing any key The boot load prompt appears on the terminal screen 8 Enter the df s command The SmartSwit...

Page 73: ...CoreDump command uses FTP to create the core_cpu and core_cmn files If your server does not run FTP create these files manually Then execute the set CoreDump command Note On UNIX systems make sure tha...

Page 74: ...0000001 r14 e00d22f0 r15 00000008 d2000000 Core Dump Common DRAM dumped to tftpboot bobr core_cmn CPU DRAM dumped to tftpboot bobr core_cpu ffffffff ffffffff ffffffff ffffffff d2000010 ffffffff ffffff...

Page 75: ...and to check the SmartSwitch 9A100 route table Are the destination addresses correct for the specified gateways Are there any routing loops Are one or more of the destination addresses mapped to the w...

Page 76: ...Check for connectivity Try pinging between end nodes Ping from the SmartSwitch 9A100 using start ping to its end nodes If you cannot ping check physical connectivity disconnected cable and so on 2 Ch...

Page 77: ...k does not appear in the Link list check the following Is the connecting port on each switch configured for PNNI If no configure both ports for PNNI Note On the SmartSwitch 9A100 use the show portconf...

Page 78: ...tal cell drop rate equal to the Unknown VC cell drop rate If yes the switch is improperly set up Check the switch configuration If no this indicates global congestion Continue 2 Set the porttrafficcon...

Page 79: ...trafficcongestion command Set the Max threshold to the value recommended in the Quality of Service Queue Allocation Guidelines section 4 Have you performed step 3 for every class of service for this p...

Page 80: ...5 6 SmartSwitch 9A100 User Guide Troubleshooting Congestion Troubleshooting...

Page 81: ...Function FAIL red Normally OFF ON indicates CPU failed STATUS amber Normally OFF ON indicates an error condition that prevents alarm information from being displayed to the console POWER green Normal...

Page 82: ...ations Figure A 1 illustrates the front panel of the SmartSwitch 9A100 switch Figure A 1 SmartSwitch 9A100 front panel NO SYNC DATA NO SYNC DATA Console Terminal RJ 45 Ethernet Port 10Base T FAIL STAT...

Page 83: ...memory cells 32 K flash memory 8 MB Serial port RS 232c compliant RJ 45 connector Ethernet port IEEE 802 3 compliant RJ 45 connector Table A 3 Physical specifications Specification Value Dimensions 50...

Page 84: ...dBm 14 dBm 14 dBm 31 dBm 2 Km Cat 5 UTP 155 Mbps STS 3 or STM 1 RJ 45 v 100 m 75 ohm coax 44 7 Mbps DS 3 nonchannelized BNC female n a n a n a n a 150 m to DSX 75 ohm coax 44 7 Mbps DS 3 nonchanneliz...

Page 85: ...NMPv1 SNMPv2c MIB II RFC 1213 Interface Table MIB RFC 1573 AToM MIB RFC 1695 AToM2 MIB pre standard LANE MIB ATM Forum ILMI 4 0 MIB ATM Forum IP over ATM MIB pre standard IISP PNNI MIB Switch hardware...

Page 86: ...A 6 SmartSwitch 9A100 User Guide Technical Specifications Specifications...

Page 87: ...rnet MIB Hierarchy The MIB structure is logically represented by a tree hierarchy see Figure B 1 The root of the tree is unnamed and splits into three main branches Consultative Committee for Internat...

Page 88: ...is shown in Figure B 2 All nodes starting with zn represent Zeitnet objects The private ZeitNet MIB is represented by the object identifier 1 3 6 1 4 1 1295 or iso org dod internet private enterprise...

Page 89: ...ct representing Lan Emulation Client information has an Object Identifier of 1 3 6 1 4 1 1295 2 3333 9 1 1 The znLecDDCount object representing the number of Data direct connections maintained by one...

Page 90: ...h 9A100 supports Simple Network Management Protocol SNMP Both the SNMPv1 and SNMPv2c formats of the protocol are supported B 1 4 Supported SMI Formats Zeitnet proprietary MIBs are defined using SNMPv2...

Page 91: ...Hardware and software system level information znSwitchDiscoveryTable 1 3 6 1 4 1 1295 2 3333 1 34 Neighbor switch configuration znConfig 1 3 6 1 4 1 1295 2 3333 2 Switch software configuration manage...

Page 92: ...ons With the current implementation of MIB files conformance to ATM standards for the SmartSwitch 9A100 ATM switch includes the following exceptions Non Conformance atmInterfaceIlmiVpi Read only atmIn...

Page 93: ...onnection between the SmartSwitch 9A100 and the NMS is the SmartSwitch 9A100 Ethernet interface Use the show SwitchConfig command to find the IP address of the SmartSwitch 9A100 An NMS can use this IP...

Page 94: ...0 SNMP agent For detailed descriptions of these commands see the SmartCell 6A000 ZX 250 Reference Manual Community Sets the community strings for the SmartSwitch 9A100 TrapCommunity Specifies the NMS...

Page 95: ...rt and Service C 1 TELEPHONE ASSISTANCE Our Technical Support Center is available Monday through Friday 8am to 8pm Eastern Time by calling 603 332 9400 C 2 FAX SERVICE You can fax support questions to...

Page 96: ...e updates and patches for verified reported software issues C 7 REPAIR SERVICES Cabletron offers an out of warranty repair service for all our products at our Santa Clara Repair Facility Products retu...

Page 97: ...yer Mux ABR Available Bit Rate AFI Authority and Format Identifier ANSI American National Standards Institute API Application Programming Interface ARP Address Resolution Protocol ASCII American Stand...

Page 98: ...de Telegraphique et Telephonique Consultative Committee on International Telegraphy and Telephony CCR Current Cell Rate CDV Cell Delay Variation CER Cell Error Ratio CES Circuit Emulation Service CI C...

Page 99: ...an standard for digital transmission service at 2 Mb s E 3 European standard for digital transmission service at 34 4 Mb s transports 16 E1 circuits E NET Ethernet EFCI Explicit Forward Congestion Ind...

Page 100: ...econd GCAC Generic Call Admission Control GCRA Generic Cell Rate Algorithm GFC Generic Flow Control HEC Header Error Check IEEE Institute of Electrical and Electronic Engineers ICMP Internet Control M...

Page 101: ...X Internetwork Packet Exchange protocol ITU TSS International Telecommunications Union Telecommunications Standards Sector ISDN Integrated Service Digital Network JPEG Joint Photographic Experts Group...

Page 102: ...work LLC Logical Link Control LMI Local Management Interface MAC Media Access Control MAN Metropolitan Area Network MB S Megabits per second MBS Maximum Burst Size MCR Minimum Cell Rate MIB Management...

Page 103: ...twork Interface NRT VBR Non Real Time Variable Bit Rate NRZ Non Return to Zero NSAP Network Services Access Point OAM Operations and Maintenance OAM P Operations Administration Maintenance and Provisi...

Page 104: ...ogrammable Read Only Memory PTI Payload Type Indicator PTP Point to Point PTSE PNNI Topology State Element PTSE PNNI Topology State Packet PVC Permanent or Provisioned Virtual Circuit QOS Quality of S...

Page 105: ...able Cell Rate SDH Synchronous Digital Hierarchy SEAL Simple Efficient Adaptation Layer SMF Single Mode Fiber SMDS Switched Multimegabit Data Service SNMP Simple Network Management Protocol SONET Sync...

Page 106: ...Transmitter Receiver Interface TCP Transmission Control Protocol TD Traffic Descriptor TDM Time Division Multiplexing TFTP Trivial File Transfer Protocol TLV Type Length and Value UBR Unspecified Bit...

Page 107: ...able Bit Rate Non real Time VC Virtual Circuit VCC Virtual Channel Connection VCI Virtual Channel Identifier VCL Virtual Channel Link VLAN Virtual LAN VP Virtual Path VPC Virtual Path Connection VPI V...

Page 108: ...D 12 SmartSwitch 9A100 User Guide Acronyms...

Page 109: ...ing 3 3 3 6 ATM ports A 4 ATM routing 4 2 B backup 4 1 bandwidth allocation 4 17 boot load commands 4 24 chpi 4 24 clfs 4 24 dcfg 4 24 df 4 24 go 4 24 he 4 24 memory locations affected 4 25 ponf 4 24...

Page 110: ...estion 5 4 display 2 9 DS3 2 3 empty cell 2 3 framing 2 3 length 2 3 mode 2 3 scrambling 2 3 timing 2 3 E E3 2 3 empty cell 2 3 mode 2 3 scrambling 2 3 timing 2 3 early packet discard 4 22 EFCI 4 22 E...

Page 111: ...nfiguration 2 8 inserting a 6A000 2 4 inspecting the switch 2 2 installation 2 4 installing the switch 2 4 IP over ATM add ipatmclient 3 1 addressing 3 3 ARP server 3 1 client 3 2 MAC address 3 3 serv...

Page 112: ...idelines 4 22 real time variable bit rate 4 21 thresholds 4 21 unspecified bit rate 4 21 QoS queues 4 21 queue thresholds 4 21 R remove 2 9 repair services C 2 resource management cells 4 22 restart 2...

Page 113: ...management 4 17 CLP 4 17 congestion 4 22 EFCI 4 22 EPD 4 22 maximum burst size 4 17 minimum cell rate 4 17 peak cell rate 4 17 queue allocation 4 22 RM cells 4 22 sustained cell rate 4 17 thresholds...

Page 114: ...I 6 SmartSwitch 9A100 User Guide Index VPI non zero values 4 15 VPI bits 4 15 VPI VCI pairs 4 15 Z ZeitNet Cabletron proprietary MIBs B 2...

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