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INTRODUCTION

1

76-02-031E

1 INTRODUCTION

1. 1 About the ATM CBR DSU Family

The ATM CBR DSU products are also known as Circuit Emulation (ATMCE DSUs), but the
term CBR is retained in this manual to correspond with the product menus.

ATM CBR DSUs are used to connect equipment which operates at constant bit rates (CBR),
such as PABXs and Video Codecs, across ATM networks. The DSUs are used in pairs, one
at either side of a Wide Area Network (WAN) link.

Since ATM is a bandwidth independent transmission mechanism, the circuit information is
segmented into ATM cells, passed across the network and then reassembled into the
original bit pattern. The ATM CBR DSU uses AAL1 Segmentation and Re-assembly for
conversion of the CBR stream into a stream of ATM cells, and vice versa.

Note that the ATM WAN links can operate with different interfaces to the CBR source,
providing that sufficient bandwidth is available on the ATM (or WAN) side to service the CBR
stream when the ATM overhead is taken into account. This means that the ATM side of the
DSU must present a higher bandwidth than the CBR side.

Figure 1.1 Bandwidth for CBR to ATM conversion

The table above simply illustrates the raw bandwidth required to convert CBR traffic into
ATM traffic. Note that the payload in each ATM cell is 47 bytes because 1 byte is used for
AAL1 segmentation/re-assembly.

Also, the effect of any ATM framing will increase the required bandwidth on the ATM side by
a further 1.3% for E3 UNI ports and 2% for DS3 UNI ports.

The ATM CBR DSU presents two types of interface:

A CBR interface providing a choice of E1, E2, E3 or DS3 lines connects to the CBR (constant
bit rate) equipment. The DSU front panel indicates this as the LINE port.

A User Network Interface (UNI) connects to the ATM WAN network providing a choice of E3,
DS3, TAXI and SDH/SONET interfaces. The ATM CBR DSU front panel indicates this as the
ATM UNI port.

CBR Link

Type

CBR Speed

Mbits/sec

ATM Cells/sec

Generated

Raw WAN ATM Bandwidth

required Mbits/sec

E1

2

⋅

048

5447

2.309

E2

8

⋅

448

22469

9.526

E3

34

⋅

368

91404

38.755

DS3

44.736

118978

50.446

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Содержание ATM CBR DSU

Страница 1: ...age Eversley Way Egham Surrey TW20 8RY United Kingdom tel 44 0 1784 744700 fax 44 0 1784 744730 email support metrodata co uk Part No 76 02 031E website www metrodata co uk Metrodata ATM CBR Circuit E...

Страница 2: ......

Страница 3: ...merchantability or fitness for any particular purpose Further Metrodata Ltd reserves the right to revise this publication and to make changes from time to time in the content hereof without obligatio...

Страница 4: ......

Страница 5: ...Connecting to a PC COM port 16 3 8 ATM UNI Port Fibre 17 3 9 ATM UNI Port BNC 17 3 10 CBR LINE Network Port BNC 18 4 INSTALLING SETTING UP 19 4 1 DSU Connections 19 4 2 Power up sequence 20 4 3 Setti...

Страница 6: ...ry style 55 6 4 5 Physical layer summary display COUNTS style 56 6 4 6 Physical layer summary display G 821 style 57 6 4 7 Physical layer summary display Percent G 821 style 58 6 5 PLCP Layer Errors A...

Страница 7: ...er Alarms 84 11 6 E3 Alarm Response 85 11 7 E3 Error Types 85 12 DS3 CBR PORT CONFIGURATION 87 12 1 DS3 Physical Interface 87 12 2 DS3 Physical Layer Framing 87 12 3 DS3 WAN Set up 87 12 3 1 Framing 8...

Страница 8: ...terface 103 15 2 TAXI Framing 103 15 3 TAXI PLCP Layer 103 15 4 TAXI ATM Layer 103 15 5 TAXI WAN Set Up 103 15 6 TAXI ATM Set Up 103 15 6 1 Forward Idle Cells 103 15 6 2 HEC Coset 103 15 6 3 Idle Cell...

Страница 9: ...17 SPECIFICATIONS 111 17 1 CBR Ports 111 17 2 ATM UNI Ports 113 17 3 General Specifications 116 17 4 ATM CBR DSU default settings 116 18 GLOSSARY 117...

Страница 10: ......

Страница 11: ...e CBR stream when the ATM overhead is taken into account This means that the ATM side of the DSU must present a higher bandwidth than the CBR side Figure 1 1 Bandwidth for CBR to ATM conversion The ta...

Страница 12: ...ined on a rolling basis Diagnostics are provided in the form of various loop backs which can be used to localise a fault condition on the line ATM CBR DSUs can be managed by connecting a video termina...

Страница 13: ...The DSUs are installed in circuit as shown in the Figure below Figure 1 2 ATM CE Deployment WAN PABX VIDEO CODEC PABX VIDEO CODEC ATM CBR DSU E1 CBR LINK E3 ATM LINK ATM NETWORK DS3 ATM LINK E1 CBR L...

Страница 14: ...nfiguring the ATM CBR DSU describes the menu driven user interface The end of this Section describes a typical set up and commissioning procedure and acts as a checklist for both first time and experi...

Страница 15: ...ates that the option leads to another menu from which further options may be chosen Screen displays which contain variable information such as the current date or time show the variable in italics sur...

Страница 16: ...INTRODUCTION 76 02 031E 6...

Страница 17: ...able screen must be terminated to the screened connector shell and not connected to any pins of the connector Failure to use the correct connector may compromise EMC compliance 2 3 EN55022 Declaration...

Страница 18: ...SU must be connected to safety earth for correct operation Safety notes Excessive voltages are present inside the unit There are no user serviceable parts inside the unit and the cover should not be r...

Страница 19: ...DSU family employ laser technology Care must be taken not to expose the eyes to laser beams or radiation since tissue damage to the eyes can result DSUs that use laser technology are the SDH Sonet mo...

Страница 20: ...STATUTORY INFORMATION 76 02 031E 10...

Страница 21: ...CBR traffic across the network as an ATM stream or to receive incoming ATM traffic One DSU front panel light is labelled ATM UNI FAULT This single light serves to indicate both MAJOR and MINOR ATM ala...

Страница 22: ...tage and current ranges are minus 36 to 72 volts DC 200 100mA A Buccaneer type socket is fitted to the rear panel and a plug is provided with the unit for the customer s own wiring The connections are...

Страница 23: ...is either a 6 pin mini DIN connector or a 9 pin D type connector allowing you to connect the major and minor alarm relay contacts within the DSU to a remote indicator such as a bell or a lamp The maxi...

Страница 24: ...VIA MODEM is set to ON version 4 xx then RTS pin 4 on the DSU terminal port needs to be correctly driven otherwise the user will be permanently logged out of the DSU To drive the RTS correctly a fully...

Страница 25: ...Minimum RS232 connection A cable to connect a local terminal to this port without a modem may have the minimum RS232 connection when this is suitable for the terminal being used as shown below Figure...

Страница 26: ...PC The connections are given in the figure below Figure 3 13 Terminal port converter cable 25 way to 9 way Notes a To inhibit the modem control function for reasons explained earlier in this section...

Страница 27: ...the panel The ATM UNI connectors are the left hand pair Connections are as follows Figure 3 14 UNI BNC Connections Note Cable lengths should be restricted to those defined in the table below Figure 3...

Страница 28: ...low Figure 3 17 Network cable lengths Note The total maximum attenuation of each of the cables attached to the Network Port must not exceed 6dB when measured at 1 024 MHz E1 4 224 MHz E2 17 184 MHz E3...

Страница 29: ...your DSU depending upon the model purchased Step 3 CBR Line Port Connect the CBR LINE port of the DSU to the WAN port of the customer premises CBR equipment Before connecting the CBR LINE port make s...

Страница 30: ...mpt e g CBR5900 When you have entered this once you will be able to change the password if you wish as described in Section 5 2 4 When you enter the appropriate password you will be presented with the...

Страница 31: ...w menu will be displayed Pressing a letter corresponding to a menu option will lead to additional prompts at the bottom of the screen Figure 4 4 Prompt screen The current value of that option will the...

Страница 32: ...orresponding to a menu option the value opposite that option will be highlighted You will also see the prompts at the bottom of the screen similar to the TTY display Figure 4 6 Prompt screen Pressing...

Страница 33: ...TTY output screens do not have graphic capability and are therefore not so easy to read when setting up the system Note If you are using Windows Hyperterm as your terminal emulator click on View Font...

Страница 34: ...INSTALLING SETTING UP 76 02 031E 24...

Страница 35: ...ng AIS Detection Framing Line coding Timing AIS Forwarding RAI Forwarding Physical interface Type of cable Distance option VPI VCI V 24 set up Special Testing Management Terminal type Baud rate Parity...

Страница 36: ...mary style Physical layer stats Error type Performance data ATM stats AAL1 stats Clear all data PLCP layer stats Special ATM masks Idle cell masks GFC VPI VCI PT CLP Good cell masks GFC VPI VCI PT CLP...

Страница 37: ...R DSU The screen examples shown in this section are all for the CBR5900 DSU which has a SDH Sonet ATM UNI port and an E3 CBR LINE port Figure 5 3 Main set up menu MAIN SET UP alarm eXtension General s...

Страница 38: ...evice may be muted by selecting CLEAR ALARM OUTPUTS When this option is selected the alarm extension status prior to the clear command is shown below the menu Figure 5 5 Alarm status screen Note If th...

Страница 39: ...led to a different level with choices MAJOR MINOR or NONE Figure 5 6 Port alarm examples The default settings for alarms are tabulated below for all ATM CBR DSU interfaces Figure 5 7 Default alarm set...

Страница 40: ...by the user to MAJOR MINOR or NONE This affects which alarm extension relay is affected by an alarm but it does not affect the behaviour of the front panel indicator lights which remain at default se...

Страница 41: ...e entered as15 08 2000 Figure 5 11 Date prompt The corresponding day of the week is also displayed when you press enter For the ATM CBR DSU the year is always entered as an explicit 4 digit number e g...

Страница 42: ...both when you next log on Figure 5 12 Password prompt For security the characters you type are displayed on the screen as asterisks You will also be asked to re enter the password as a verification ch...

Страница 43: ...ring unwanted messages A typical config file is shown below Figure 5 14 Metrodata DSU Configuration dump file Metrodata CBR5300 local connection to nodename Start capture then press a key After transf...

Страница 44: ...ment terminal connected to the DSUs terminal port When INPUT CONFIG is selected from the menu screen the following message appears Figure 5 15 Input config message screen The Hyperterm path TRANSFER S...

Страница 45: ...th fibre and copper media options The DSU set up screens display only the appropriate set up options for the interface detected in the DSU Sections 9 to 16 of this manual give set up details and speci...

Страница 46: ...CI values The default values are 0 zero Figure 5 19 ATM set up screens To set up the ATM UNI port the user must complete the screen menu options to specify the ATM set up required as summarised in the...

Страница 47: ...DLE CELL PAYLOAD This option allows the User to specify a bit pattern for use in the payload of idle ATM cells instead of all zeros This provides some transmission traffic in situations where this is...

Страница 48: ...a Modem Modem support This option specifies whether a modem is to be used or not If the state of this option is set to YES with version 4 xx firmware the option is activated immediately without the ne...

Страница 49: ...5 7 Load new config Except for the terminal type the changes you make on the V 24 Set up screen do not take effect until you register the changes in the DSU To do this select LOAD NEW CONFIG after you...

Страница 50: ...t This option permits a reset to the internal ATM FIFO cell buffers By resetting the buffers it is possible to clear out and restart the data path This option should not normally be used but is availa...

Страница 51: ...The nodename will be erased but the real time clock will not be affected For security you will be asked to confirm this request Pressing Y will perform the cold start pressing any other key will cance...

Страница 52: ...If any event log contains the message SPURIOUS RESET or ILLEGAL INTERRUPT please register this occurrence with your Supplier or Distributor of the product The logs are divided into three separate logs...

Страница 53: ...Section 6 The PERFORMANCE DATA menus are below Figure 5 29 Performance data menus and will be one of two types depending upon whether the interface has a PLCP layer or not Alarm Event Log 17 2 2002 08...

Страница 54: ...meters first so that they correspond to the DSUs default settings as given in Section 4 5 b You may then change the DSUs BAUD RATE PARITY DATA BITS and STOP BITS from the default setting if you wish a...

Страница 55: ...hat these parameters are compatible with the configuration of the network attached to the ATM UNI interface Step 7 Bandwidth management The DSU contains a 128 cell bi directional FIFO This acts as a s...

Страница 56: ...CONFIGURING THE ATM CBR DSU 76 02 031E 46...

Страница 57: ...xtensive performance analysis functions This enables long term quality of service information at layers 0 1 and 2 for to be derived as follows Figure 6 1 ATM CBR DSU Interfaces and layers 6 2 Physical...

Страница 58: ...o front panel fault lights serve the LINE port of the DSU These are labelled LINE MAJOR and LINE MINOR e When testing the Line status takes priority over the ATM status if tests are being run on both...

Страница 59: ...ror Definitions BIP Parity errors BIP 8 SDH Sonet further defines these as B1 BIP B2 BIP and B3 BIP3 errors FEBE Far End Block Errors SDH Sonet further defines FEBE s as Path FEBE or Line FEBE Code Ph...

Страница 60: ...mmary has been selected as opposed to a Report from the DISPLAY MODE menu item This menu option is therefore described in section 6 4 3 6 3 3 Clear all data CLEAR ALL DATA clears the complete performa...

Страница 61: ...nterface being reported They are used for routine daily monitoring of the DSU and the Network Summaries are more flexible and both the interface and type of error being monitored are user selected tog...

Страница 62: ...nt Valid EFS ES BES SES UAS DM Valid LOS LOF AIS RAI SQ OSP 14 09 23 0 900 0 0 0 0 0 0 900 0 0 0 0 0 0 14 24 23 0 900 0 0 0 0 0 0 900 0 0 0 0 0 0 14 39 23 0 900 0 0 0 0 0 0 900 0 0 0 0 0 0 14 54 23 0...

Страница 63: ...creen Metrodata CBR5900 Local connection to nodename E3 Interface 1 of 6 LCV Errors Alarmed seconds Period Starting Count Valid EFS ES BES SES UAS DM Valid LOS LOF AIS RAI SQ OSP 14 09 23 0 900 0 0 0...

Страница 64: ...stantly refresh the display This applies to each of the display styles Static Updated and 15 minute displays The Current 15 mins column gives the error counts for the current partial 15 minute period...

Страница 65: ...e Physical layer The PLCP and ATM layer statistics are given in separate later subsections COUNTS Errors and alarms accumulate and are quoted as an absolute count G 821 Errors and alarms are expressed...

Страница 66: ...5900 Local connection to nodename 13 32 54 Mon 11 3 2002 PERFORMANCE SUMMARY SDH Sonet Current Alarms None Diag None Temporary Current Previous Last Counts 15 mins 15 mins 24 hours Alarm counts Total...

Страница 67: ...nnection to nodename 13 32 54 Mon 11 3 2002 PERFORMANCE SUMMARY SDH Sonet Current Alarms None Diag None Temporary Current Previous Last Counts 15 mins 15 mins 24 hours Alarm counts Total Secs 856 510...

Страница 68: ...larms None Diag None Temporary Current Previous Last Counts 15 mins 15 mins 24 hours Alarmed time Total secs 856 510 900 86400 LOS 0 0000 0 0000 0 0000 0 0000 LOF 0 0000 0 0000 0 0000 0 0000 AIS 0 000...

Страница 69: ...alarms Note YEL Yellow alarms at the PLCP layer are the PLCP layer equivalent of the Physical layer RAI alarm DS3 SDH Sonet PERFORMANCE DATA PERFORMANCE DATA Interface DS3 Interface SDH Sonet Display...

Страница 70: ...of frame events YEL Number of PLCP remote alarm events known at the physical layer as RAI PLCP BIP FEBE Frame Errors Summary Style Counts Total seconds Elapsed time of current interval Error count Nu...

Страница 71: ...11 3 2002 PLCP PERFORMANCE SUMMARY DS3 Current Alarms None Diag None Temporary Current Previous Last Counts 15 mins 15 mins 24 hours Alarm counts Total Secs 856 510 900 86400 LOF 0 0 0 0 YEL 0 0 0 0 B...

Страница 72: ...s LOC Display Description Valid Amount of time in which the statistics are valid LOC Loss of Cell delineation The layer 1 receiver cannot perform HCS alignment owing to 7 consecutive HCS errors TX b w...

Страница 73: ...arms None Diag None Temporary Counts Current 15 mins Previous 15 mins Last 24 hours Valid Secs 1400 654 900 86400 LOC Secs 0 0 0 0 Tx Cells 0 0 0 0 B w usage 0 0000 0 0000 0 0000 0 0000 Rx Cells 0 0 0...

Страница 74: ...000 0 0 14 39 23 0 0000 0 0000 0 0000 0 0 14 54 23 0 0000 0 0000 0 0000 0 0 15 09 23 0 0000 0 0000 0 0000 0 0 15 24 23 0 0000 0 0000 0 0000 0 0 15 39 23 0 0000 0 0000 0 0000 0 0 15 54 23 0 0000 0 0000...

Страница 75: ...If the Sequence Number counter is cycling correctly and contains no errors the 47 byte payload is added to the re assembly buffer located in the ATM CBR DSU The Sequence Number is CRC checked and erro...

Страница 76: ...1 Display parameters PERFORMANCE DATA Interface E1 Display mode Updated summary Summary style G 821 Phys layer stats display Error type LCV Errors ATM layer stats display Clear all data HIGHLIGHTED le...

Страница 77: ...s 24 hours Valid Secs 800 600 900 86400 LOSEQ Secs 0 0 0 0 Seg Cells 76800000 57600000 86400000 8294400000 B w usage 100 0000 100 0000 100 0000 100 0000 Reass Cells 0 0 0 0 B w usage 0 0000 0 0000 0 0...

Страница 78: ...ANALYSING PERFORMANCE 76 02 031E 68...

Страница 79: ...ocal LAN or on a remote LAN connected to the local LAN via a LAN bridge or IP router When the SNMP Enabler is fitted to the DSU the MAIN SET UP menu contains the option MANAGEMENT Figure 7 1 Main set...

Страница 80: ...it is a future release item but is included here to indicate its forthcoming availability For further information on the management interface and the MIB definition refer to the LM1100 SNMP Enabler u...

Страница 81: ...able for the CBR LINE port Local loop Two types of test loops are available for the ATM UNI port Local Loop Outside Loop Diagrams showing the functioning of these test loops are given in Figure 8 2 an...

Страница 82: ...his therefore validates the signal flow through the ATM CBR DSU as seen from the CBR port of the DSU 8 2 3 UNI Port Outside loop When this test is activated the DSU loops the signal at the UNI interfa...

Страница 83: ...TEST TROUBLESHOOTING 73 76 02 031E Figure 8 2 Local loop Outside loop tests CE I F UNI I F CELL MATRIX WAN AAL1 CPU CE I F UNI I F CELL MATRIX WAN AAL1 CPU CE I F UNI I F CELL MATRIX WAN AAL1 CPU...

Страница 84: ...LED e If the LINE MINOR alarm LED is on check that the PABX is configured correctly Step 2 Establish and verify the ATM UNI Link Repeat steps a to d for the ATM UNI port noting that there is only a s...

Страница 85: ...en selecting the E1 interface from the two port identities displayed Figure 9 1 E1 set up 9 3 1 Framing E1 physical layer framing is fixed as UNFRAMED 9 3 2 Line Coding LINE CODING is fixed with a val...

Страница 86: ...nnel to be used for circuit emulation traffic VCI values between 0 and 65535 can be selected Notes a If VPI 0 and VCI 0 then the traffic generated cannot be distinguished from idle cells and will be d...

Страница 87: ...ponses 9 7 E1 Error Types BPV errors may be gathered to generate performance data Figure 9 5 E1 Error types Alarm Response LOS MAJOR alarm lamp lights Other port transmits according to its AIS RAI for...

Страница 88: ...E1 CBR PORT CONFIGURATION 76 02 031E 78...

Страница 89: ...n selecting the E2 interface from the two port identities displayed Figure 10 1 E2 set up 10 3 1 Framing E2 physical layer framing is fixed as UNFRAMED 10 3 2 Line Coding LINE CODING is fixed with a v...

Страница 90: ...Channel to be used for circuit emulation traffic VCI values between 0 and 65535 can be selected Notes a If VPI 0 and VCI 0 then the traffic generated cannot be distinguished from idle cells and will b...

Страница 91: ...ponses 10 7 E2 Error Types BPV errors may be gathered to generate performance data Figure 10 5 E2 Error types Alarm Response LOS MAJOR alarm lamp lights Other port transmits according to its AIS RAI f...

Страница 92: ...E2 CBR PORT CONFIGURATION 76 02 031E 82...

Страница 93: ...UP and then selecting the E3 interface from the two port identities displayed Figure 11 1 E3 Set up 11 3 1 Framing E3 physical layer framing is fixed as UNFRAMED 11 3 2 Line Coding LINE CODING is fixe...

Страница 94: ...annel to be used for circuit emulation traffic VCI values between 0 and 65535 can be selected Notes a If VPI 0 and VCI 0 then the traffic generated cannot be distinguished from idle cells and will be...

Страница 95: ...ponses 11 7 E3 Error Types LCV errors may be gathered to generate performance data Figure 11 5 E3 Error types Alarm Response LOS MAJOR alarm lamp lights Other port transmits according to its AIS RAI f...

Страница 96: ...E3 CBR PORT CONFIGURATION 76 02 031E 86...

Страница 97: ...electing the DS3 interface from the two port identities displayed Figure 12 1 DS3 Set up 12 3 1 Framing DS3 physical layer framing is fixed as UNFRAMED 12 3 2 Line Coding LINE CODING is fixed with a v...

Страница 98: ...Virtual Channel to be used for circuit emulation traffic VCI values between 0 and 65535 can be selected Notes a If VPI 0 and VCI 0 then the traffic generated cannot be distinguished from idle cells an...

Страница 99: ...esponses 12 7 DS3 Error Types LCV errors may be gathered to generate performance data Figure 12 5 DS3 Error types Alarm Response LOS MAJOR alarm lamp lights Other port transmits according to its AIS R...

Страница 100: ...DS3 CBR PORT CONFIGURATION 76 02 031E 90...

Страница 101: ...payload 13 4 E3 ATM layer The payload carries 10 ATM cells per E3 frame giving a cell rate of 80 000 cells per second 13 5 E3 WAN Set up The E3 port parameters are set by selecting the path MAIN SET U...

Страница 102: ...mask to be forwarded rather than deleted 13 7 HCS coset The HCS COSET option allows the HCS to be X ORed with 0x55 so that the idle cell HCS is non zero Mode Description Never AIS never transmitted fr...

Страница 103: ...in the cell 13 8 E3 ATM masks The DSU deletes cells whose headers match the mask identified by the IDLE CELLS entry Note that idle cells have a CLP bit set to 1 while unassigned cells have this bit s...

Страница 104: ...gnment word errors BIP 8 BIP 8 parity errors FEBE FEBE s Far End Block Errors giving statistics based upon far end receiver performance Display Description LOS Loss of Signal the Layer 0 receiver cann...

Страница 105: ...OF MAJOR alarm lamp lights E3 port transmits RAI Other port transmits according to its AIS RAI forwarding configuration SQ MAJOR alarm lamp lights E3 port transmits RAI Other port transmits according...

Страница 106: ...E3 UNI PORT CONFIGURATION 76 02 031E 96...

Страница 107: ...f 12 ATM cells making 636 bytes of payload together with 49 bytes of overhead 14 4 DS3 ATM layer The cell rate is 96 000 cells per second 14 5 DS3 WAN Set up The DS3 port parameters are set by selecti...

Страница 108: ...AI forwarding Mode Description Never AIS never transmitted from the DS3 port On RAI AIS transmitted from the DS3 port when RAI on the other port On LOF AIS AIS transmitted from the DS3 port when LOF A...

Страница 109: ...d scrambling PAYLOAD SCRAMBLING prevents cell traffic from ghosting Frame Alignment patterns and thereby causing false framing The default value is disabled 14 6 4 Idle cell payload The IDLE CELL PAYL...

Страница 110: ...the path MAIN SET UP ATM MASKS DS3 PORT Figure 14 6 DS3 ATM masks 14 8 DS3 Physical layer error types Errors within the following primitives may be gathered to generate performance data Figure 14 7 D...

Страница 111: ...ving the outgoing transmission properly OOSP Out Of Spec Clock caused by the TX PLL having problems locking Alarm Response LOS MAJOR alarm lamp lights DS3 port transmits RAI Other port transmits accor...

Страница 112: ...DS3 UNI PORT CONFIGURATION 76 02 031E 102...

Страница 113: ...configuration 15 6 TAXI ATM Set Up The configuration of the TAXI port ATM characteristics are set using the path MAIN SET UP ATM SET UP TAXI PORT Figure 15 1 TAXI ATM Set up 15 6 1 Forward Idle Cells...

Страница 114: ...larm Response In the presence of an alarm condition on the TAXI port the following responses are established Figure 15 4 TAXI Alarm responses 15 10 TAXI Error Types There are no physical layer primiti...

Страница 115: ...16 3 SDH Sonet PLCP Layer ATM cell payload is byte aligned with the SDH Sonet frames 16 4 SDH Sonet ATM Layer The cell rate is 353208 cells per second Connector Type Fibre Type Wavelength Typical Tx P...

Страница 116: ...igure 16 4 SDH Sonet timing 16 5 3 AIS Forwarding AIS FORWARDING is used to select the AIS Alarm Indication Signal alarm forwarding mode Options are Figure 16 5 SDH Sonet AIS forwarding SDH SONET PORT...

Страница 117: ...cell traffic from ghosting Frame Alignment patterns and thereby causing false framing The default value is enabled 16 6 4 Idle Cell Payload The IDLE CELL PAYLOAD option allows special patterns to be...

Страница 118: ...SONET Figure 16 8 SDH Sonet ATM masks 16 8 SDH Sonet Physical Layer Alarms The SDH Sonet physical layer alarms that are detected are as follows Figure 16 9 SDH Sonet Physical alarms SDH SONET PORT 1...

Страница 119: ...transmits RAI Other port transmits according to its AIS RAI forwarding configuration AIS MINOR alarm lamp lights SDH Sonet port transmits RAI Other port transmits according to its AIS RAI forwarding c...

Страница 120: ...SDH Sonet UNI PORT CONFIGURATION 76 02 031E 110...

Страница 121: ...ER TOLERANCE per G 823 FRAMING LAYER 1 Unframed PLCP LAYER 11 2 none ATM LAYER 2 none AAL1 LAYER 5446 cells second ERROR TYPES BPV E2 CBR port INTERFACE TYPE E2 PHYSICAL LAYER 0 BNC 75 Ohm coax BARRIE...

Страница 122: ...823 FRAMING LAYER 1 Unframed PLCP LAYER 11 2 none ATM LAYER 2 none AAL1 LAYER 91404 cells second ERROR TYPES LCV DS3 CBR port INTERFACE TYPE DS3 PHYSICAL LAYER 0 BNC 75 Ohm coax BARRIER EN 41003 comp...

Страница 123: ...832 G 804 PLCP LAYER 11 2 none ATM LAYER 2 80 000 cells second ATM LAYER ERRORS HEC PHYSICAL LAYER ERRORS LCV Frame REBE BIP 8 DS3 UNI PORT INTERFACE TYPE DS3 PHYSICAL LAYER 0 BNC 75 Ohm coax DATA RA...

Страница 124: ...PHYSICAL LAYER 0 ST connector pair multi mode fibre or PHYSICAL LAYER 0 Dual SC connector multi mode fibre or PHYSICAL LAYER 0 Dual SC connector single mode fibre short haul or PHYSICAL LAYER 0 Dual S...

Страница 125: ...F TYPE SONET OC 3 STS 3 SDH STM 1 PHYSICAL LAYER 0 Dual BNC connectors or PHYSICAL LAYER 0 ATM User Device RJ45 connector or PHYSICAL LAYER 0 ATM Network Equipment RJ45 connector DATA RATE 155 52 Mbp...

Страница 126: ...Statistics database Real time statistics time stamped and logged in a database accumulating over 15 minutes 96 x 15 minute buckets are stored for rolling 24 hour database General Definition Power sup...

Страница 127: ...r Violation CBR Constant Bit Rate CE Circuit Emulation CMI Coded Mark Inversion CRC Cyclic Redundancy Check DM Degraded Minutes DSU Data Service DSU DCE Data Communication Equipment DTE Data Terminal...

Страница 128: ...ock Alarm PLCP Physical Layer Convergence Protocol PVC Permanent Virtual Channel RAI Remote Alarm Indication aka FERF REBE Remote End Block Error SAR Segmentation And Reassembly SDH Synchronous Digita...

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