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Chapter 1: Understanding HDSL and the Express L768/L1.5

Express L768/L1.5 User Manual

61202192L1-1

Front Panel

Figure 1-5 shows the front panel of the Express L768/L1.5. The indicators are
divided into LAN functions, WAN functions, and Test functions.

Indicators

TX/RX

Flashes when transmitting and receiving data on the

10BaseT connector.

Link integrity. Illuminates when there is a good

connection between the Express L768/L1.5 and the

Hub/NIC card.

LOOP/LOOP1

Flashes when loop 1 (pins 1 and 2 on RJ-45) is not

in sync. Solid when loop 1 is in sync.

LINK/LOOP2

On Express L768: Illuminates when either PPP or

Frame Relay has an active connection.

On Express L1.5: Flashes when loop 2 (pins 4 and

5 on RJ-45) is not in sync. Solid when loop 2 is in sync.

Figure 1-5

Express L768/L1.5 Front Panels

EXPRESS L1.5

TX/RX

LOOP1

LOOP2

PWR

LINE

TEST

EXPRESS L768

TX/RX

LOOP

LINK

PWR

LINE

TEST

L768

L1.5

Summary of Contents for Express L1.5

Page 1: ...Express L768 and Express L1 5 HDSL Router Bridge USER MANUAL Express L768 1202192L1 Express L1 5 1202192L2 61202192L1 1B June 1998...

Page 2: ...mark of ADTRAN Inc Macintosh is a registered trademark of Apple Computer Inc Novell NetWare and Internetwork Packet Exchange IPX are registered trademarks of Novell Inc Windows is a registered tradema...

Page 3: ...sonnel For continued protection against risk of fire replace F1 with the same type and rating of fuse only 2A 250 V FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT This equipm...

Page 4: ...iring associated with a single line individual service may be extended by means of a certified connector assembly telephone extension cord Compliance with the above conditions may not prevent degradat...

Page 5: ...L1 5 8 Factory Default 8 Bridging 8 IP Routing 9 IPX Routing 9 Concurrent Routing And Bridging 9 Network Address Translation Mode 9 Front Panel 10 Indicators 10 Rear Panel 11 Configuration 11 Security...

Page 6: ...Es 25 WAN L2 Protocol 25 Configuration IP 26 IP IP Address 26 IP Subnet Mask 26 IP Default Gateway 26 IP Static Routes 27 Static Routes Active 27 Static Routes IP Address 27 Static Routes Subnet Mask...

Page 7: ...rk 38 WAN IPX Bridge Frame Type 38 WAN IPX Bridge Seed Status 38 WAN IPX Bridge Triggered 38 Bridge Spanning Tree 38 Spanning Tree Mode 38 Spanning Tree Priority 39 Spanning Tree Maximum Age 39 Spanni...

Page 8: ...apping DLCI 50 DLCI Mapping IP Map 50 Map Active 50 Map IARP 51 Map Far End IP Address 51 Map IP Netmask 51 Map Link IP Address 51 Map RIP Protocol 51 Map RIP Method 52 Map RIP Direction 52 IP Map NAT...

Page 9: ...er 62 PPP Max Failure 62 PPP Profile Filters 62 Filters WAN to LAN In 62 Filters In Exceptions 63 Filters LAN to WAN Out 64 Filters Out Exceptions 64 Configuration Management 65 Management Telnet 65 T...

Page 10: ...Status IP Stats 77 Test Menu 78 Test Menu Echo Request 78 Test Menu 2047 Loopback 78 Logs Menu 79 Logs Sys log Host 79 Logs PPP Log 79 PPP Log Active 80 PPP Log Wrap 80 PPP Log Level 80 PPP Log View 8...

Page 11: ...tilities Exit 85 Chapter 4 Specification 87 Specifications and Features 87 Network Interface 87 Ethernet Interface LAN 87 Display 87 Environmental 87 Physical 87 Power 87 Appendix A Loop Status Messag...

Page 12: ...Table of Contents viii Express L768 L1 5 User Manual 61202192L1 1...

Page 13: ...Top Level Terminal Menu 16 Figure 3 2 Configuration System Info Screen 22 Figure 3 3 Configuration WAN Screen 24 Figure 3 4 Configuration IP Screen 26 Figure 3 5 Configuration IPX Screen 33 Figure 3 6...

Page 14: ...List of Figures x Express L768 L1 5 User Manual 61202192L1 1...

Page 15: ...61202192L1 1 Express L768 L1 5 User Manual xi List of Tables Table D A IBM AT Style EIA 232 Interface 103 Table D B RJ 45 HDSL BRI U 103 Table D C 10BaseT Ethernet 104...

Page 16: ...List of Tables xii Express L768 L1 5 User Manual 61202192L1 1...

Page 17: ...hen press Enter to display the top menu 3 Using the arrow keys and Enter key to navigate the menu go to the Con figuration WAN HDSL menu Enter the line mode as HTU C or HTU R Each end of an HDSL circu...

Page 18: ...Quick Startup Guide 2 Express L768 L1 5 User Manual 61202192L1 1...

Page 19: ...or 12 000 feet on 24 AWG wire without the need for loop conditioning or repeater installation The benefits HDSL offers over traditional T1 span lines represent large cost savings for the service provi...

Page 20: ...two wire mode if the rate is 768K and below See Figure 1 1 for an illustration of the Express L768 L1 5 The 10BaseT con nector operates at 10 Mbits per second half duplex and accepts standard eth erne...

Page 21: ...tagram Protocol UDP broadcasts are relayed to corporate LAN Client device can obtain the Internet Protocol IP address dynamically us ing Dynamic Host Configuration Protocol DHCP Compatible with popula...

Page 22: ...mmuter Home Office Access to the corporate LAN Access to any other router within the Frame Relay Network User Datagram Protocol UDP broadcasts are relayed to corporate LAN FramePort 768 part no 110004...

Page 23: ...press L768 L1 5 provides the following basic functions 1 LAN Bridge Bridging provides a point to point connection between two LANs The bridge learning function scans the source and destination me dia...

Page 24: ...r packets can be PPP or Frame Relay RFC 1490 PPP allows a point to point connec tion whereas Frame Relay can provide up to ten permanent virtual cir cuits Routing and Bridging with the Express L768 L1...

Page 25: ...and advertised using Novell s RIP and SAP Concurrent Routing And Bridging The Express L768 L1 5 can route IP and IPX as well as bridge non IP IPX packets simultaneously The PPP profile will by default...

Page 26: ...integrity Illuminates when there is a good connection between the Express L768 L1 5 and the Hub NIC card LOOP LOOP1 Flashes when loop 1 pins 1 and 2 on RJ 45 is not in sync Solid when loop 1 is in syn...

Page 27: ...transfers data up to 768 kbps over a two wire facility The Express L1 5 transfers data up to 1 536 Mbps over a four wire facility This type of service is a permanent connection between endpoints or be...

Page 28: ...A RADIUS client can also be used The Telnet configuration can also be protected using the same authentication methods Each menu item in the Express L768 L1 5 has a security level asso ciated with it A...

Page 29: ...ering T1 service directly to the pub lic D4 channel banks began to be used for T1 in corporate network topogra phies for voice The advances in computer development also created a demand for T1 data co...

Page 30: ...ems HDSL satisfies the telco distance requirements without the use of repeaters LOCAL AREA NETWORK CONNECTION The Express L768 L1 5 has a 10BaseT connector that provides half duplex 10 Mbps operation...

Page 31: ...ing menu the Main menu or top level menu is the access point to all other operations Each Main menu item has several functions and sub menus to identify and access specific parameters Figure 3 1 on pa...

Page 32: ...nal submenus available through this pane are indicated by the and DATA symbols Left Pane Lists available menus Mode Describescurrent operating mode Loop Status Displays current status of HDSL line Rat...

Page 33: ...d for performing diagnostic testing of the Express L768 L1 5 See the section Test Menu on page 78 for detailed information on the tests available Logs The Logs menu can be used for viewing the operati...

Page 34: ...guration submenu so the path display shows Express XLT Config uration Moving Around Press Tab or the right arrow key to move the cursor from the left pane to the right pane Press Tab or the left arrow...

Page 35: ...ime you pressed J Press J anytime you want to jump between these items Arrow Keys Selects items and moves between the left and right panes The left arrow key allows you to go back up the menu Enter Ac...

Page 36: ...e list are copied For example if the cursor is over the Num field in the Frame Relay Mapping screen all of the information associated with the Map entry is copied P Pastes the item stored in the clipb...

Page 37: ...at menu item The Telnet session is assigned a security level set by the user Passwords can only be accessed as security level 0 The maintenance port is always at se curity level 0 The security levels...

Page 38: ...e security 3 Read security 5 Provides a user configurable text string for the name of the Express L768 L1 5 This name can help distinguish between different installations You can enter up to 31 alpha...

Page 39: ...umeric characters in this field including spaces and special characters such as an under bar Firmware Revision Read security 5 Displays the current firmware revision level of the Express L768 L1 5 Thi...

Page 40: ...elects the mode the HDSL line is in HDSL Mode Write security 2 Read security 5 The Express L768 L1 5 can be in two modes HDSL Terminal Unit Central HTU C or HDSL Terminal Unit Remote HTU R def For HDS...

Page 41: ...on the other end of the link Continuous errors can indicate a line problem but a burst at one time is normal WAN L2 Protocol Write security 3 Read security 5 This parameter specifies the layer 2 data...

Page 42: ...Screen IP IP Address Write security 2 Read security 5 The IP address assigned to the Express L768 L1 5 s Ethernet port is set here This address must be unique within the network Factory default is 10...

Page 43: ...IP address of the host or network address of the device being routed to Static Routes Subnet Mask Write security 4 Read security 5 This mask determines the bits in the previous IP address that are us...

Page 44: ...IP RIP Write security 3 Read security 5 The Routing Information Protocol RIP is supported by the Express L768 L1 5 The following parameters are required for setting up the mode on the Ethernet port R...

Page 45: ...cts as a DHCP server and will dynamically assign IP network mask default gateway and DNS ad dresses to any device which transmits a broadcast DHCP request The ad dresses assigned are based on the Expr...

Page 46: ...ver addresses can be exchanged between PPP peers When a connection occurs and IPCP is negotiated the Express L768 L1 5 will get the DNS server addresses from the PPP peer If the configured DNS server...

Page 47: ...ll act as a relay agent UDP Relay UDP Relay List Up to four relay destination servers can be specified in this list UDP Relay List Relay Address Write security 3 Read security 5 This is the IP address...

Page 48: ...he IP addresses behind one of its ports The device which sent the ARP request will then cor rectly assume that it can reach the requested IP address by sending packets to the physical address that was...

Page 49: ...e security 2 Read security 5 When this option is set to On def the Express L768 L1 5 will route IPX Set ting it to Off will disable all IPX functionality IPX Network Write security 2 Read security 5 T...

Page 50: ...twork number for the Ethernet segment Non Seed def The Express L768 L1 5 will listen for an IPX network number being sent by another router including Novell software routers residing on servers on the...

Page 51: ...rity 5 This value specifies how often the Express L768 L1 5 sends out IPX SAP Ser vice Access Protocol packets on the network segment attached to the Ethernet port The SAP packets sent contain informa...

Page 52: ...packets which include ARP packets are not bridged When IPX routing is active IPX packets are not bridged Also the WAN IP Bridge and WAN IPX Bridge menus allow the WAN connection to bridge packets to t...

Page 53: ...IP updates are sent when the routing table has changed When set to No def updates are sent periodically RIP version method and direction are determined by the Ethernet parameters set in the Configurat...

Page 54: ...he IPX seed status WAN IPX Bridge Triggered Write security 2 Read security 5 When set to Yes only IPX RIP and SAP updates are sent when the routing or service table has changed When set to No def upda...

Page 55: ...een the generation of configuration BPDUs Bridging Pro tocol Data Units by the root bridge The value is in one tenth seconds with a range between 10 1 0 second and 100 10 0 seconds The default is 20 2...

Page 56: ...Active Write security 2 Read security 5 The Bridge Group 1 port can be disabled when set to No In this mode no bridge traffic will be forwarded in or out Setting to Yes def allows the port to particip...

Page 57: ...sents Bridge Group 1 and WAN1 represents Bridge Group 2 This menu permits the user to adjust the parameters or rules for the table as addresses are learned Address Table Aging Write security 3 Read se...

Page 58: ...y Screen Security Authentication Write security 1 Read security 2 The method used for authenticating the PPP peer is selected here The possi ble values are None def No attempt is made to authenticate...

Page 59: ...unicate with when the primary server does not respond Radius Server UDP Port Write security 1 Read security 2 This is the UDP port that the Express L768 L1 5 should use when communi cating with the RA...

Page 60: ...other capabilities which allow more flexibility than CHAP The following selections are possible PAP CHAP or EAP def The Express L768 L1 5 will ask for EAP during the first PPP LCP negotiation and allo...

Page 61: ...ation address used for comparison hexadecimal format Dest Mask Bits in the MAC destination address used for comparison hexadecimal format MAC Type 16 bit MAC type field used for comparison hexadecimal...

Page 62: ...Range 0 to 65535 decimal format Src Port Cmpr Type of comparison that is performed means ports equal to not means port not equal to means port greater than means port less than None means the source...

Page 63: ...s which are compared hexadecimal format Src Socket 16 bit value which is the source socket Range 0 65535 Src Socket Comp Type of comparison that is performed means socket equal to Not means socket not...

Page 64: ...manent Virtual Circuits PVC and Switched Virtual Circuit SVC PVCs are like ded icated point to point private lines Since the physical connection is always there in the form of a leased line call setup...

Page 65: ...cate with Frame Relay Polling Frequency Write security 3 Read security 5 This parameter is the interval that the Express L768 L1 5 polls the Frame Re lay switch using the maintenance protocol selected...

Page 66: ...meters from an old profile to this newly inserted profile use the copy C and paste P keys Entire configuration trees can be copied with this method To delete an unused profile use the D key when the c...

Page 67: ...t When this DLCI becomes active the Express L768 L1 5 will add a route in the IP routing table IP Map IP Netmask Write security 3 Read security 5 The IP network mask to apply to the Far End IP Address...

Page 68: ...lly transmitted and are listened to on this virtual circuit Tx Only RIP advertisements are periodically transmitted but are not listened to on this virtual circuit Rx Only RIP is not transmitted on th...

Page 69: ...DLCI Mapping Bridge Map This menu is used to permit bridging of packets over this DLCI Each DLCI or virtual circuit must be assigned a bridge group The bridge group treats all virtual circuits as one...

Page 70: ...ming packets from this PVC are blocked except as defined in the Filters In Exceptions list Forward All All incoming packets from this PVC are not blocked except as defined in the Filters In Exceptions...

Page 71: ...rity 5 The packets which transmit out this PVC from the Express L768 L1 5 can be filtered in three ways Disabled def Turns off packet output filtering No outgoing packets to this PVC are blocked Block...

Page 72: ...he profile used when connected using PPP Figure 3 9 shows the PPP profile menu Figure 3 9 Configuration PPP Profile Screen PPP Profile Authentication The authentication menu contains the required para...

Page 73: ...cated using PAP CHAP or EAP CHAP or EAP The connection can be authenticated using CHAP or EAP only EAP TheconnectionwillonlyallowauthenticationbythepeerusingEAP Authentication Tx Username Write securi...

Page 74: ...ess negotiated with the PPP peer ISP Multiple stations on the Ethernet side can access the Internet simultaneously See the section IP NAT on page 29 for more global options Setting this option to On w...

Page 75: ...ite security 3 Read security 5 The Express L768 L1 5 can perform version 1 V1 def or version 2 V2 of RIP on this WAN connection RIP Method Write security 3 Read security 5 Split Horizon Only routes no...

Page 76: ...er s network to the routing table The Express L768 L1 5 normally will treat the WAN network as an unnum bered link This is usually referred to as being a half router However a PPP peer which wants to...

Page 77: ...ters needed for exchanging bridged packets with the PPP peer Bridge Mode Write security 3 Read security 5 When set to On def the Express L768 L1 5 will attempt to negotiate PPP BCP with the PPP peer B...

Page 78: ...is the number of configuration naks that should occur before an option is configuration rejected This allows a connec tion to succeed that might otherwise fail The possible values are 5 def 10 15 and...

Page 79: ...to On Type Selects the filter define list to reference MAC from the Configuration Security Filter Defines MAC Filter Defines list Pattern from the Configuration Security Filter Defines Pattern Filter...

Page 80: ...led def Turns off packet output filtering No outgoing packets are blocked Block All All outgoing packets to the WAN are blocked except as defined in the Filters Out Exceptions list Forward All All out...

Page 81: ...hods can be protected using authentication Figure 3 10 shows the Configuration Management menu Figure 3 10 Configuration Management Screen Management Telnet Any Telnet client application can bring up...

Page 82: ...authenticating the user User List Password Write security 0 Read security 3 When the authenticating method is password this text string is used for the password User List Idle Time Write security 1 R...

Page 83: ...g lists SNMP Communities This list is used to set up to eight SNMP communities names that the Express L768 L1 5 will allow Factory default sets the community public with Get privileges Communities Nam...

Page 84: ...rt The Express L768 L1 5 has an EIA 232 connector on the back of the unit The setup for that port is under this menu Maint Port Password Protect Write security 0 Read security 1 When set to No the mai...

Page 85: ...ity that the maintenance port will run The possi ble values are None def Odd or Even Maint Port Stop Bits Write security 5 Read security 5 This is the stop bit used for the maintenance port The possib...

Page 86: ...192L1 1 STATUS MENU The Express L768 L1 5 s Status menu contains comprehensive status and di agnostic information used in verifying configuration and identifying prob lems The menus are divided into p...

Page 87: ...nks Reflects LCP layer active BCP Shows UP if PPP Bridge Control Protocol has negotiated successfully IPCP Shows UP if PPP IP Control Protocol has negotiated successfully IPXCP Shows UP if PPP IPX Con...

Page 88: ...g active selection Tx Frames Number of Frame Relay packets that have been transmitted via this DLCI Rx Frames Number of Frame Relay packets that have been received via this DLCI Tx Bytes Number of Fra...

Page 89: ...n the listening state Learning Port is in the learning state Forwarding Port is in the forwarding state with the following possible properties root is the root port designated is designated port Block...

Page 90: ...IP Routes Port Port gateway is located on local sent directly to the Express L768 L1 5 router eth0 Express L768 L1 5 s ethernet port wan0 Express L768 L1 5 s first PPP bundle fr 0 fr 9 Express L768 L...

Page 91: ...e Number of times the Express L768 L1 5 has referenced the route IPX Routes Hops Number of routers that must go through to get to destination Ranges from 0 15 or 16 for infinite can t get there from h...

Page 92: ...stics for the Ethernet port Tx Packets Packets transmitted out the Ethernet port Rx Packets Packets received from the Ethernet port Tx Errors Total transmit errors encountered on Ethernet port Single...

Page 93: ...t No application at dest port UDP datagrams received UDP bad packets ICMP redirected messages ICMP packet errors ICMP timeouts received ICMP messages sent ICMP messages received ICMP specif if errors...

Page 94: ...Echo Request Write security 4 Read security 5 When activated the echo request test will begin sending continuous PPP echo request packets to any open LCP ports Results are displayed on the screen This...

Page 95: ...e divided up as follows level 0 Fatal event causes reset level 1 Critical event level 2 Error event level 3 Warning event level 4 Notify event level 5 Informational event level 6 Debugging event Figur...

Page 96: ...must be at or below this level Range is 0 to 6 The default is 3 PPP Log View This menu displays the log list The fields are as follows Date Time Date and time event occurred Level Level associated wit...

Page 97: ...s are as follows Date Time Date and time event occurred Level Level associated with this event 0 6 Message Text message for this event If message is too long to fit on the line another event appears b...

Page 98: ...nge is 0 to 6 The default is 3 Network Log View This menu displays the log list The fields are as follows Date Time Date and time event occurred Level Level associated with this event 0 6 Message Text...

Page 99: ...Read security 5 The ping menu is used to send ICMP ping messages to hosts The following items are under this menu Start Stop Activator to start and cancel a ping test Host Address IP address or domai...

Page 100: ...s firmware can be upgraded using this menu Upgrade Transfer Method The two methods for upgrading are TFTP and XMODEM TFTP requires a TFTP server running somewhere on the network The Express L768 L1 5...

Page 101: ...ess L768 L1 5 s maintenance port Press Return to display a simple terminal menu for upgrad ing This menu appears when the flash code has been erased or is corrupt The menu will also appear if you powe...

Page 102: ...Chapter 3 Terminal Menu Operation and Structure 86 Express L768 L1 5 User Manual 61202192L1 1...

Page 103: ...two wire Express L768 or four wire Express L1 5 ser vice Signal Format 2B1Q Max distance per loop 8000 feet at 26 AWG Ethernet Interface LAN Ethernet IEEE 802 3 10BaseT Display Available through termi...

Page 104: ...Chapter 4 Specifications 88 Express L768 L1 5 User Manual 61202192L1 1...

Page 105: ...what it is configured for under Configuration WAN HDSL Rate Echo Tx X Rx Y The current transmit and receive count for the PPP echo request test Layer 1 up The Express L768 L1 5 s HDSL layer 1 is up Li...

Page 106: ...Appendix A Loop Status Messages 90 Express L768 L1 5 User Manual 61202192L1 1...

Page 107: ...t X has been successfully negotiated between Express L768 L1 5 and PPP peer CCP X down level 5 Compression Control Protocol port X has been dropped between Express L768 L1 5 and PPP peer CCP X up leve...

Page 108: ...X has been successfully negotiated between Ex press L768 L1 5 and PPP peer IPXCP X down level 5 IPX Control Protocol port X has been dropped between Express L768 L1 5 and PPP peer IPXCP X up level 5 I...

Page 109: ...the Configuration Con nection List Authentication parameters Tx Method Tx Username and Tx Password are correct Peer failed CHAP authen level 3 The PPP peer s reported CHAP username and or password doe...

Page 110: ...ng the method set in Configuration Security PPP Peer refused SpanTree level 4 The PPP peer would not participate in the Spanning Tree protocol This is a warning message only Bridging will still occur...

Page 111: ...ed for the interface number inter DHCP couldn t alloc mem level 1 A DHCP response could not be generated due to memory allocation problems DHCP response sent level 4 A DHCP response was successfully s...

Page 112: ...been closed telclient bad host level 2 Telnet client could not use host name or IP address set in Configuration Util ities Telnet Client Host telclient bad init level 2 Telnet client could not initia...

Page 113: ...ge related to Telnet server function TELNETD Clr TCBF_BUFFER flag failed level 6 Debugging message related to Telnet client function TELNETD could not obtain peer ip level 2 Telnet server function cou...

Page 114: ...l 2 TFTP client function could not open a UDP port TFTP error rcvd message level 2 Received error with message from TFTP server TFTP lost communication level 2 Lost communication to TFTP client or ser...

Page 115: ...am that collects controls and presents data pertinent to the operation of the network devices It resides on a network management station Agent This is a control program that responds to queries and co...

Page 116: ...age is the response to a network manager GetRe quest or GetNextRequest command Trap This is an unsolicited message issued by a network device to report an operational anomaly or an alarm condition to...

Page 117: ...each community can be set The default community is public with read only privileges When the IP address is all zeros any manager of the community can access the Express L768 L1 5 Traps Up to four host...

Page 118: ...Appendix C SNMP 102 Express L768 L1 5 User Manual 61202192L1 1...

Page 119: ...cription 1 CD N C Carrier Detect 2 RD O Receive Data 3 TD I Transmit Data 4 DTR N C Data Terminal Ready 5 GND N A Signal Ground 6 DSR N C Data Set Ready 7 RTS I Request to Send 8 CTS O Clear to Send 9...

Page 120: ...Table D C 10BaseT Ethernet The switch position can be set for either TO NIC or TO HUB on the back panel of the Express L768 L1 5 The rear panel is illustrated in Figure 1 6 on page 11 Switch Position...

Page 121: ...terface Terminal commands are as follows top_menu sub_menu1 sub_menu2 config_item Each config_item is entered as shown below TYPE ENTERED AS string printable characters within double quotes password p...

Page 122: ...s directly to Con guration IP menu ipx Goes directly to Con guration IPX menu bridge Goes directly to Con guration Bridge menu security Goes directly to Con guration Security menu ppp Goes directly to...

Page 123: ...768 L1 5 in terminal mode A baud rate of 9600 is strongly recommended when uploading As soon as the upload has been completed type save to save the new configuration to flash A reset command or power...

Page 124: ...Appendix E Terminal Mode Commands 108 Express L768 L1 5 User Manual 61202192L1 1...

Page 125: ...tion Protocol Used for resolving physical address when IP ad dress is unknown B Channel 64 kbps bearer channel used for voice circuit or packet switched data bearer service As defined by CCITT standar...

Page 126: ...gth of time CSMA CD is used by Ethernet and IEEE 802 3 D channel The ISDN channel that carriers signalling information to control the call setup teardown or invocation of supplementary services The D...

Page 127: ...two copper pairs hop count A routing metric used to measure the distance between a source and a desti nation Particularly used by RIP hub 1 Communications center 2 Major routing station for connecting...

Page 128: ...T Communications Satellite Business Systems GTE Telenet GTE Sprint and MCI information element The name for the data fields within an ISDN Layer 3 message interworking Communication between two types...

Page 129: ...ly back to its input looped around and the returning data is checked against that which was sent Media Access Control MAC As defined by the IEEE the lower of the two sublayers of the OSI reference mod...

Page 130: ...e jitter In telephony the measurement in degrees out of phase that an analog signal deviates from the reference phase of the main data carrying signal Often caused by alternating current components in...

Page 131: ...formation that is required by internet routers in order to route datagrams from any source socket to any destination socket in the internet Using RTMP internet routers dynamically maintain routing tab...

Page 132: ...kbps With more advanced digital voice encoding techniques it can handle more voice channels T1 is a standard for digital transmission in North America TA Terminal Adaptor A DCE that connects to the IS...

Page 133: ...eive information In contrast a 4 wire circuit consists of two pairs One pair is used to send and one pair is used to receive All trunk cir cuits long distance are 4 wire A 4 wire circuit delivers bett...

Page 134: ...Glossary 118 Express L768 L1 5 User Manual 61202192L1 1...

Page 135: ...graphy and Telephony CD Carrier Detect CPE Customer Premises Equipment CRC Cyclic Redundancy Check CSMA CD Carrier Sense Multiple Access Collision Detect DHCP Dynamic Host Configuration Protocol DLCI...

Page 136: ...table Unit NBP Name Binding Protocol NEBE Near End Block Errors NIC Network Interface Card NI 1 National ISDN 1 NT Network Termination PBX Private Branch Exchange PC Personal Computer PING Packet Inte...

Page 137: ...name 57 B baud rate 68 bridge 61 bridge group 1 40 bridge group 1 active 40 bridge group 1 path cost 40 bridge group 1 priority 40 bridge group 2 active 40 bridge group 2 path cost 41 bridge group 2 p...

Page 138: ...ng 8 DHCP mode 29 display 87 DLCI mapping 49 DLCI mapping active 50 DLCI mapping bridge map 53 DLCI mapping DLCI 50 DLCI Mapping filters 54 DLCI mapping IP map 50 DLCI mapping IPX map 52 DLCI table 72...

Page 139: ...map active 50 IP map far end IP address 51 IP map IARP 51 IP map IP netmask 51 IP map link IP address 51 IP Map NAT 52 IP map RIP direction 52 IP map RIP method 52 IP map RIP protocol 51 IP menu 26 IP...

Page 140: ...rd protect 68 maint port stop bits 69 maintenance port 68 maintenance protocol 49 management 65 management maint port 68 management SNMP 67 management Telnet 65 maximum age 39 menu commands 105 menu s...

Page 141: ...radius server primary server 43 radius server retry count 43 radius server secondary server 43 radius server secret 43 radius server UDP port 43 rate status messages 89 rear panel 11 RIP 8 9 28 59 RI...

Page 142: ...P cache 73 status bridge table 74 status IP routes 74 status IP stats 77 status IPX routes 75 status IPX servers 75 status LAN stats 76 status sessions 71 status WAN stats 76 stop bits 69 subnet mask...

Page 143: ...idle time 66 user list level 66 user list name 66 user list password 66 using keyboard to navigate menu 19 utilities menu 17 83 utilities exit 85 utilities ping 83 utilities Telnet client 84 utilitie...

Page 144: ...Index 128 Express L768 L1 5 User Manual 61202192L1 1...

Page 145: ...rmines that a repair is needed Technical Support will coordinate with the Customer and Product Service CAPS de partment to issue an RMA number For information regarding equipment currently in house or...

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