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TEST & TROUBLESHOOTING

76-02-011F

9. 2 DTE interface

9 . 2. 1 DTE Loop

When

DTE LOOP

is activated the signal received from the local DTE is passed directly back

to the DTE at the DTE interface. The signal from the remote DTE passes through both the
FM4900’s and is looped adjacent to the local FM4900’s DTE port. This therefore validates:

a) the local DTE cable (without the effect of the FM4900) if the local DTE recognises its own
transmissions.

b) the remote DTE cable, the E3 link and both FM4900’s if the remote DTE recognises its
own transmissions.

Figure 9. 2 DTE loop test

HSSI

Содержание FM4900

Страница 1: ...Village 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 011F website www metrodata co uk Metrodata FM4900 User M...

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Страница 3: ...r 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 obligati...

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Страница 5: ...10 4 3 Power Supply 10 4 4 Remote Management port 11 4 5 Alarm Extension 11 4 6 Terminal Port 12 4 6 1 Minimum RS232 connection 13 4 6 2 V 24 Terminal Cable 25 Way to 25 Way 13 4 6 3 Connecting to a P...

Страница 6: ...5 Event Logs 34 6 9 Performance Data 35 6 10 Unit Set up Checklist 36 7 ANALYSING PERFORMANCE 37 7 1 Introduction 37 7 2 Errors and Alarms 37 7 2 1 Error types 37 7 2 2 E3 Port Alarm responses 37 7 2...

Страница 7: ...rnal loop control 51 9 2 DTE interface 52 9 2 1 DTE Loop 52 9 2 2 DTE External Loop 53 9 3 Network Interface NI 54 9 3 1 NI Remote Loop 54 9 3 2 NI Local Loop 55 9 3 3 Remote management during testing...

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Страница 9: ...ons including major and minor alarms and bit errors is kept for the last 24 hours Statistics are recorded every 15 minutes and processed into G 821 format Ninety six 15 minute periods are kept which m...

Страница 10: ...INTRODUCTION 76 02 011F 2 1 2 Typical FM4900 Installation Figure 1 1 FM4900 typical deployment E3 LINK FM4900 HSSI ROUTER WAN FM4900 E3 LINK HSSI ROUTER...

Страница 11: ...talling Setting up takes you through the basic steps of connecting the FM4900 to the external devices that you may have The structure of the menus is described in Section 6 Configuring the FM4900 as w...

Страница 12: ...s that the option leads to another menu from which further options may be chosen Screen displays that contain variable information such as the current date or time show the variable in italics surroun...

Страница 13: ...ectromagnetic Compatibility In order to ensure EMC compliance all signal and data cables and connectors must use a screened connector shell with a screened cable The cable screen must be terminated to...

Страница 14: ...inside the unit and the cover should not be removed by unqualified personnel The unit must not be exposed to damp or condensing conditions The FM4900 must be connected to safety earth for correct ope...

Страница 15: ...d with high density binary 3 HDB3 code words to ensure pulse density and therefore clocking information and an average DC potential of 0V The transmission rate is 34 368 Mbps 3 2 G 751 Framing Groups...

Страница 16: ...TECHNICAL OVERVIEW 76 02 011F 8...

Страница 17: ...t the time and these are described in Figure 4 2 below Figure 4 2 Front panel alarms LED Colour Meaning Power Red Mains power is being received Line Major Minor Red Yellow LOS LOF or SQ alarm is prese...

Страница 18: ...socket is fitted to the rear panel and a plug is provided with the unit for the customer s own wiring The connections are labelled on the rear panel of the unit On some units an additional Ground stu...

Страница 19: ...rt layout 4 5 Alarm Extension This port contains 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 FM4900 to a r...

Страница 20: ...erminal port needs to be correctly driven otherwise the user will be permanently logged out of the DSU To drive the RTS correctly a fully configured cable can be used together with a terminal that sup...

Страница 21: ...without a modem may have the minimum RS232 connection when this is suitable for the terminal being used as shown below Figure 4 9 Local terminal cable pinout Note To inhibit the modem control functio...

Страница 22: ...9 pin COM port The connections are given in the figure below Figure 4 11 Terminal port converter cable 25 way to 9 way Notes To inhibit the modem control function for reasons explained earlier in thi...

Страница 23: ...or should be used for connections to this port Note The HSSI port is regarded as a SELV port within the scope of EN 41003 Figure 4 12 HSSI port connector layout VEPin No VE Pin No Function CCT No 1 26...

Страница 24: ...of the cables attached to the network port must not exceed 6dB when measured at 17 184 MHz The frequency attenuation characteristic of the cables attached to the network port shall follow a root frequ...

Страница 25: ...2m of cable connecting the two Step 3 WAN Connect the WAN by means of the two BNC bayonet connectors on the rear panel of the unit Note Before connecting the network port make sure that you have read...

Страница 26: ...word you can change any parameters that are not defined as read only The default operator password is the same as the model number i e FM4900 When you have entered this once you will be able to change...

Страница 27: ...TTY display is shown below Figure 5 3 TTY Main set up menu When you press a letter which leads to a further menu the screen will scroll up and the new menu will be displayed The highlighted menu item...

Страница 28: ...l be refreshed without scrolling displaying the new menu The highlighted menu item REMOTE LOGON only appears on the screen when G 751 Framed mode is selected and DATALINK is enabled The item MANAGEMEN...

Страница 29: ...he FM4900 s V 24 settings can be changed using the V 24 SET UP menu which is accessed from the MAIN SET UP menu described in the next section The default terminal is a Teletype TTY but the vast majori...

Страница 30: ...INSTALLING SETTING UP 76 02 011F 22...

Страница 31: ...y seeks to logon to the local node as described in section 5 2 Pressing the escape key on any screen will return you to the previous screen in the structure Time Date Nodename Password Telnet timeout...

Страница 32: ...extension Selecting the menu item ALARM EXTENSION on the MAIN SET UP menu leads to a further menu Figure 6 3 Alarm extension screen MAIN SET UP alarm eXtension menu General set up menu WAN port set up...

Страница 33: ...larms are labelled from 0 to 9 and A to Z in the firmware and can be selected by their label Framed mode alarms Unframed mode alarms Figure 6 5 NI Port alarm config Note When in UNFRAMED mode AIS only...

Страница 34: ...current date in the format dd mm yyyyy For example April 4th 2001 would be entered as 4 4 2001 The corresponding day of the week is also displayed when you press enter Leading zeros are suppressed by...

Страница 35: ...ill accept either upper or lower case or a mixture of both when you next log on Figure 6 10 Password prompt For security the characters you type are displayed on the screen as asterisks You will also...

Страница 36: ...employed in the FM4900 and the values are INTERNAL and LOOP The E3 Line TX clock is derived from the DTE using CCT 113 TT terminal timing The HSSI specification requires this signal to be a non gated...

Страница 37: ...le in G 751 Framed mode It enables you to control and monitor statistics from the remote FM4900 The options are ON or OFF When DATALINK is set to ON The National bit Bit 12 of the framing overhead des...

Страница 38: ...s one of those below depending on which of the two units is selected either or Figure 6 13 Datalink screens We advise that each unit be given a unique node name to make identification easier To logout...

Страница 39: ...for information only 6 5 2 CA This controls the CA Control Available signal It can be set to ON OFF or THROUGH When set to THROUGH the control signal reflects the current state of the E3 receive port...

Страница 40: ...200 baud 6 6 3 Parity Parity may be set to NONE ODD or EVEN 6 6 4 Data bits The number of data bits may be 7 or 8 6 6 5 Stop bits The number of stop bits may be 1 or 2 6 6 6 Modem support Modem suppor...

Страница 41: ...t version status and start up modes and event logs 6 8 1 Software version This option displays the current version of the software on your FM4900 This is provided for information only 6 8 2 Hardware v...

Страница 42: ...fter a cold start Section 5 shows the FM4900 s default settings 6 8 5 Event Logs Event logs are intended to provide a long term history of major occurrences on the system They can be the first port of...

Страница 43: ...been taken remotely without the knowledge of the local user of a node Figure 6 19 Config event log 6 9 Performance Data This option gives you access to the FM4900 s performance monitoring functions T...

Страница 44: ...Check the current time and date and change them if necessary as already described Check the nodename of the local FM4900 and change it if necessary Check the Operator Password and change it if necessa...

Страница 45: ...ting the ALARM EXTENSION CLEAR ALARM OUTPUTS option from the MAIN SET UP menu After the alarm has been cancelled as above it is still indicated on the front panel indicators and in the performance sta...

Страница 46: ...s section of the Performance reports summaries in Framed mode or if AIS has been ENABLED in Unframed mode b The CLEAR ALL DATA option clears the complete performance statistics database This may be ne...

Страница 47: ...in 103 errors UAS Unavailable seconds declared after SES for 10 consecutive seconds DM Degraded minutes 1 in 106 errors minute Alarms Definition LOS Loss Of Signal No data and therefore no clocking in...

Страница 48: ...d 15 minute summaries These modes are described in the subsections below describing reports and summaries Reports and summaries are dealt with separately since they have different characteristics The...

Страница 49: ...of 6 I FAS Errors Alarmed seconds Period Starting Count Valid EF ES BES SES UAS DM Valid LOS LOF AIS RAI SQ 14 09 23 0 900 0 0 0 0 0 0 900 0 0 0 0 0 14 24 23 0 900 0 0 0 0 0 0 900 0 0 0 0 0 14 39 23...

Страница 50: ...e is added to the printout every 15 minutes Figure 7 8 Rolling report screen Metrodata FM4900 Local connection to nodename NI Interface 1 of 6 I FAS Errors Alarmed seconds Period Starting Count Valid...

Страница 51: ...atic Updated and 15 minute displays The Current 15 mins column gives the error counts for the current partial 15 minute period Therefore the duration of statistics within this column varies between 0...

Страница 52: ...s which have a fixed style The SUMMARY STYLE option only shows on the menu when a SUMMARY has been selected in the DISPLAY MODE The styles available are Figure 7 9 Summary styles Counts Errors and ala...

Страница 53: ...in the Temporary Counts column only It may be best to confirm an alarm situation by setting the summary screen to G 821 style when an alarm is present Metrodata FM4900 Local connection to nodename 13...

Страница 54: ...tion The definition of G 821 as parameters per second gives a different summary layout than that for Counts style In Counts style an event is recorded once only Metrodata FM4900 Local connection to no...

Страница 55: ...urrent Alarms None Diag None Temporary Current Previous Last Counts 15 mins 15 mins 24 hours Alarmed time Total secs 856 510 900 86400 LOS 00 0000 00 0000 00 0000 00 0000 LOF 0 0000 0 0000 0 0000 0 00...

Страница 56: ...ANALYSING PERFORMANCE 76 02 011F 48...

Страница 57: ...be accessed remotely by using a Network Management System NMS connected to the LAN The NMS should use SNMP Simple Network Management Protocol and could be located on the local LAN or on a remote LAN c...

Страница 58: ...shown here to indicate its forthcoming availability For further information on the management interface and the MIB definition refer to the LM1100 SNMP Enabler user manual The MIB definitions support...

Страница 59: ...Figure 9 1 Testing menu The interface to be tested and the type of test to carry out are selected using this screen Definitions of the menu items are given below 9 1 1 DTE When DTE is selected you can...

Страница 60: ...e The signal from the remote DTE passes through both the FM4900 s and is looped adjacent to the local FM4900 s DTE port This therefore validates a the local DTE cable without the effect of the FM4900...

Страница 61: ...ates the E3 link both FM4900 s and both sets of DTE cables if the remote DTE recognises its own signals Note that if EXTERNAL LOOP CONTROL is DISABLED the remote loop code receiver in the DSU is inhib...

Страница 62: ...eated 100 The Loop Up code is transmitted for 5 5 seconds with the remote FM4900 going into Loop after 4 5 seconds The remote FM4900 stays in this mode until Loop Down is transmitted from the local un...

Страница 63: ...lines LA and LB These loops may also be activated from the TESTING menu b The DTE EXTERNAL LOOP may only be activated via the TESTING menu 9 3 3 Remote management during testing Care must be taken wh...

Страница 64: ...nd verify the DTE Links If the MINOR alarm LED is on check that the Bridges Routers are switched on If the MINOR alarm LED remains on check that the DTE connections are in place and secure If the MINO...

Страница 65: ...ote loop Display Style Counts G 821 percent G 821 Error type FAS G 751 mode Code errors Management V 24 terminal through terminal port SNMP through managementport Telnetthroughmanagementport Managemen...

Страница 66: ...d to their default settings The table below lists the default values Option Default Node name This field cleared Password FM4900 Telnet Timeout 60 seconds Framing G 751 Timing Internal Datalink On CA...

Страница 67: ...3 High Density Binary 3 LAN Local Area Network LOF Loss of Frame alarm LOS Loss of Signal alarm MIB Management Information Base NI Network Interface NMS Network Management System RAI Remote Alarm indi...

Страница 68: ...FM4900 SPECIFICATIONS 76 02 011F 60...

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