U S E R G U I D E High Speed Base Band Modems Desktop Versions Ascom part no: 1/265/001/610 Issue 02 – May 2001 a for faster transmission
ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems Note The information contained in this document is supplied without liability for errors or omissions. Ascom Telecommunications Limited reserves the right to make changes to this document at any time without notice.
2 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems COMPLIANCE NOTES AND SAFETY INSTRUCTIONS TTE - Network Statements: Network connections for which the apparatus is compatible: a) b) c) d) e) f) 1 1 SCOPE 7 2 SYSTEM DESCRIPTION 9 2.1 INTRODUCTION 9 2.2 EXAMPLE APPLICATIONS 10 2.2.1 Desktop modem to desktop modem with no external timing 10 2.2.2 Desktop modem to desktop modem with external timing 10 Caution - Electrostatic sensitive device 2.
ASCOM USER GUIDE High Speed Base Band Modems 5 6 ASCOM USER GUIDE High Speed Base Band Modems 4.3.3 Desktop unit to Ascom rack system 20 6.5 STATUS MENU 32 4.3.4 Desktop unit to Ascom AM70 Multiplexer 20 6.5.1 Unit Status 32 6.5.2 Alarms 33 6.5.3 Line Quality 33 TROUBLESHOOTING 21 5.1 QUICK GUIDE TO BASIC FAULT FINDING 21 6.5.4 Interface Status 33 5.2 DEFAULT CONFIGURATION 22 6.5.5 Menu Locked/Unlocked 34 5.3 LINK PERFORMANCE 22 6.6 TEST MENU 35 5.3.
6 ASCOM USER GUIDE High Speed Base Band Modems 8 ASCOM USER GUIDE High Speed Base Band Modems USER INTERFACES 51 8.1 X21 (V.11) 51 8.1.1 15 Way D-type X.21 (V.11) Connector pin allocation 51 8.1.2 Module Link Settings 51 8.1.3 External Timing 52 8.2 X.21 BIS (V.24/V.28) 53 8.2.1 25 Way D-type X.21 bis (V.24/V.28) Connector pin allocation 53 8.2.2 Module Link Settings 53 8.2.3 External Timing 53 8.3 V.35 54 8.3.1 V.35 (MRAC) Connector Pin Allocation 54 8.3.
8 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems 2 9 SYSTEM DESCRIPTION 2.1 INTRODUCTION All versions of the High Speed Base Band Modems provide synchronous communication of data over twisted copper pair(s). The The The The The AM64/128EA unit operates at 64Kbps and 128Kbps over a single pair. AM64/384A unit operates from 64Kbps to 384Kbps over a single pair. AM64/512A unit operates from 64Kbps to 512Kbps over a single pair.
10 ASCOM USER GUIDE High Speed Base Band Modems 2.2 ASCOM USER GUIDE High Speed Base Band Modems EXAMPLE APPLICATIONS 2.2.4 Desktop unit to Ascom AM70 Multiplexer 1 or 2 copper pairs The diagrams below illustrate some basic applications: 2.2.
12 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems 3 13 U N I T F E AT U R E S 3.1 FRONT PANEL Program LED Power LED Test LED Receive Fault LED Data LED POWER FAULT MENU ascom 3 RXD SCROLL SELECT PROG AM-64/512A Liquid Crystal Display Item Scroll Buttons Menu Select Buttons Item LCD Power LED Fault LED Test LED TEST Program Buttons Item Select Buttons Function Liquid Crystal Display. Modem displays menu system here.
14 ASCOM USER GUIDE High Speed Base Band Modems 3.2 ASCOM USER GUIDE High Speed Base Band Modems REAR PANEL 4 15 I N S TA L L AT I O N 4.1 UNPACKING AND CONSIGNMENT CHECK The desktop version of the high speed modem comes packed complete with a 1.5m mains lead fitted with a country variant mains plug, an RJ45 to RJ45 line cord and where necessary, an RJ45 to BT style converter lead (where applicable). Each modem comes with its appropriate user interface module fitted.
16 ASCOM USER GUIDE High Speed Base Band Modems 4.2 ASCOM USER GUIDE High Speed Base Band Modems CONNECTING THE HIGH SPEED MODEM 17 Your modem should now be connected as illustrated in the following diagram: Connect the mains lead into the IEC type socket on the rear of the unit and plug the other end into an earthed mains supply. WARNING! This unit must be used only with power supplies providing a safety earth.
18 ASCOM USER GUIDE High Speed Base Band Modems With your modems connected as described above, the configuration procedure is as follows. 4.3.1.1 • • ASCOM USER GUIDE High Speed Base Band Modems • Press the SCROLL DOWN button once. The LCD will indicate the line rate, e.g. 512K: • Press the SELECT button until the desired rate appears. • Press the PROG button to implement your settings. The PROGRAM LED will go out.
20 ASCOM USER GUIDE High Speed Base Band Modems 4.3.2.1 Setting External Timing • Select the CONFIG MENU. • Press the SCROLL DOWN button four times. One of the following messages will appear: • Press the Select Button until the required timing mode is displayed. • Press the PROG button to implement your setting. The modem is now configured for external timing. 4.3.3 ASCOM USER GUIDE High Speed Base Band Modems 5 TROUBLESHOOTING 5.1 QUICK GUIDE TO BASIC FAULT FINDING No.
ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems DEFAULT CONFIGURATION 5.3.2 The modem has a default configuration, and reverts to this when: With a BERT still connected as above, turn off the local loop and apply the remote loop. The remote loop loops data back to the user interface from the far end modem as shown below, thus this test can be used to check the integrity of the line. (1) The interface module has been changed.
24 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems 25 F R O N T PA N E L M E N U S Y S T E M 6 F R O N T PA N E L M E N U S Y S T E M The front panel menu system allows you to make all the necessary changes to configuration and set up via the front panel buttons and liquid crystal display. You can navigate between menus using the MENU LEFT and MENU RIGHT buttons, and navigate between items in each menu by using the SCROLL UP and SCROLL DOWN buttons.
26 ASCOM USER GUIDE High Speed Base Band Modems 6.2 ASCOM USER GUIDE High Speed Base Band Modems MENU STRUCTURE 6.3 The items in each menu are as shown below: CONFIG MENU The configuration menu contains the items that define the set-up and mode of operation of the modem.
28 ASCOM USER GUIDE High Speed Base Band Modems 6.3.1 Modem Mode When two modems are connected together to form a link one end must be configured as SLAVE and the other as MASTER. The major configuration settings set at the MASTER modem will be downloaded to the slave during synchronisation. The modems can be set to IND SLAVE (independent Slave) and IND MASTER. Here the configuration is not transferred between the modems, and must be setup individually.
30 ASCOM USER GUIDE High Speed Base Band Modems 6.4 OPTION MENU The option menu relates to items that are specific to each interface module. Interface Type ASCOM USER GUIDE High Speed Base Band Modems 6.4.2.1 Interface Settings • 105 Set On. Clamps line 105 permanently ON. • 106 Delay. Causes line 106 to follow 105 after a delay of about 20mS • 107 Set On. Clamps line 107 permanently ON. • 108/1 Set On. Clamps line 108 permanently ON.
32 ASCOM USER GUIDE High Speed Base Band Modems 6.5 ASCOM USER GUIDE High Speed Base Band Modems STATUS MENU This menu displays alarm information to indicate the operational state of the modem. • Receive Data. Modems synchronised and far end control signals are on, local end are off. • Send Data. Modems synchronised and local control signals are on, far end are off. • Data Transfer. Modems are synchronised and control signals are on at both ends of link. 6.5.
34 ASCOM USER GUIDE High Speed Base Band Modems 6.5.5 Menu Locked/Unlocked To prevent unauthorised tampering with the modem configuration the front panel controls can be disabled. This MENU item shows the status of this feature. It’s also possible to change the setting from this menu item by using a special key sequence.
ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems Local Loop On/Off 6.6.3 Turning on the local loop causes the modem to loop data back to the customer interface (loop 3c – ITU X.150). If local loop is on then remote loop and data test are unavailable. This loop can also be applied from the customer interface: For X21: The DTE should send the ART pattern (11001100) and have its control line “C” set OFF. For V.35, V.
38 ASCOM USER GUIDE High Speed Base Band Modems 6.6.5 ASCOM USER GUIDE High Speed Base Band Modems Data Test • This mode allows the user to send a PRBS (Pseudo Random Binary Sequence) pattern to the remote modem and monitor the received data stream for errors. The number of bits received in error is displayed on the LCD. The test time elapsed can also be displayed, allowing the user to calculate the effective Bit Error Rate if required.
40 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems 7 41 VT100 SYSTEM CONTROL You can stop the test by pressing SELECT. The display will show. 7.1 Pressing SELECT will start the test again. Pressing the SCROLL DOWN button displays the duration the test has been running in seconds. QUICK SET-UP GUIDE The following sections will provide step by step guidance for the use of the VT100 control features of the HSBBM.
42 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems STEP 3 Press CTRL-V to return to the “Screen Menu”. This time you will see that there are more options. Simply type the letter to the left of the required menu to enter it. MOVING AROUND AND CHANGING VALUES To access other screens, you can return to the “Screen Menu” again by typing CTRL-V and then choosing the required screen by typing its associated letter.
44 ASCOM USER GUIDE High Speed Base Band Modems 7.3 ASCOM USER GUIDE High Speed Base Band Modems USE OF CONTROLS USING TERATERM Function Appearance Moving between screens: Moving between items on a screen Button Check boxes Radio buttons [ ] Key Actions in Teraterm To move directly between the screens: CTRL-N to go forward. CTRL-P to go backwards. CTRL-V to go to “Screens Menu”. 7.
46 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems Once logged in, the message above the login line changes to “Logged in as XXXX” where XXXX is the login level. For user login level, the screen will appear as follows: AM64/1024A V3.0 SCREENS The following example shows the screens available at the user login level: AM64/1024A Password Status: 7.5 47 V3.
48 ASCOM USER GUIDE High Speed Base Band Modems 7.6 ASCOM USER GUIDE High Speed Base Band Modems 49 TEST COUNTS Most of the screens can be used in the same way as the front panel menu control. However, the Test Counts screen requires some explanation: AM64/1024A Item Description A General Statistics V3.
50 ASCOM USER GUIDE High Speed Base Band Modems 7.7 ASCOM USER GUIDE High Speed Base Band Modems CHANGING PASSWORDS AM64/1024A 8 51 USER INTERFACES V3.0 Password Status: No Alarm Guest= Helen User= Jennifer Techie= Michael Supervisor= Helmut [x] Use Password [x] DCD Logout Auto-logout (mins)= 20 Logged in as Supervisor Logout 8.1 X21 (V.11) 8.1.1 15 Way D-type X.21 (V.11) Connector pin allocation. Pin A-wire B-wire 15 2 4 3 5 6 7 1 9 11 10 12 13 14 8.1.
52 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems J2 – X.21 SEXT (External Signal Element Timing) Circuit Termination – This link connects a 120 ohm load resistor across the SEXT circuit in position 1-3. This helps maintain signal rise times and minimises reflections at rates greater than 9.6kbps over long lines. At lower rates and over short lines the termination resistor may be omitted, (link set position 1-2). 8.1.
54 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems The circuit 105 - circuit 109 crossover may not be necessary if circuit 105 is clamped to the on position (section 6.4.2.2). 8.3.2 55 Module Link Settings Additionally, if circuits 108 and 107 are used in the handshaking procedure, they may be crossed as well. MRAC Connector 8.3 V.35 8.3.1 V.
56 ASCOM USER GUIDE High Speed Base Band Modems ASCOM USER GUIDE High Speed Base Band Modems 8.4 RS530 8.4.1 25 Way D-type RS-530 Connector pin allocation Pin Unbal 1 7,22, 10,13 5 6 8 21 18 25 8.4.
58 ASCOM USER GUIDE High Speed Base Band Modems 8.4.3 ASCOM USER GUIDE High Speed Base Band Modems External Timing 8.5.2 59 Module Link Settings If External timing is required i.e. the modem is to be used as a DTE then a change over cable will be required as shown in the diagram below.
60 ASCOM USER GUIDE High Speed Base Band Modems 8.5.3 ASCOM USER GUIDE High Speed Base Band Modems External Timing 8.7 If External timing is required i.e.
