ATL AM64/128A Operation & User’s Manual

Text of ATL AM64/128A User Guide:

• ATL AM64/128A, AM64/128A User Manual Test Menu 19 With a G.703 Interface fitted, the application of a local loop will cause G.703 data to be looped back to the G.703 network at the G.703 interface (known as a Loop B / LCB loop on the G.703 linecard and standalone units) as shown in figure 5.4.1.2 below. 5.4.1.2 Local loop from DTE To apply a local loop in this fashion refer to your DTE equipment handbook for details on how to send the pattern. The BBM can be in any menu when this loop is applied, it does not have to be in the Test Menu. Note : The Test Menu ‘Loc Loop’ message does not reflect the state of a loop applied from th

• ATL AM64/128A, AM64/128A User Manual Menu Operation - Status Menu 17 5.3.6 Operating Mode The BBM is capable of operating in two basic modes: S > Link Mode S > Network Mode For a BBM to BBM link this display should read Link Mode. If however a Line Card is used instead of a master BBM, then the display should read Network Mode. The essential differences of Network mode are that the line card can download the Options (105 Set On, 106 Delay, 107=108, 108/1 Set On, can be set from the line card and control from the

• ATL AM64/128A, Contents AM64/128A User Manual 3 CONTENTS 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 2. Constructional Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 2.1 Base Band Modems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 2.2 Interface Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 4. Installation . . . . . . . . . . . . . . . . . . . . . . . . . .

• ATL AM64/128A, AM64/128A User Manual Alarm Status 15 5.3.2 Alarm Status The possible messages for this item are: S > No Alarm S > No Signal S > Receiving AIS S > No Alignment The S > No Signal display indicates that the transmission system cannot find a signal to lock on to. Possible causes are: (a) Broken or defective line (b) Both ends master, or both ends slave (c) Incorrect line rate (d) Line attenuation / noise level too high The S > Receiving AIS display indicates that an AIS (Alarm Indication Signal) pattern is being received from the line. This should not normally occur in a BBM to BBM link, but can be generated if the master BBM is

• ATL AM64/128A, Status Menu AM64/128A User Manual 16 5.3.3 User Rate This item displays the user rate in current use. A complete list is given in section 5.5 - Rate Menu. For example: S > 48K 10 5.3.4 Line Rate This has to be set locally to the BBM via the front panel and cannot be downloaded from the Master unit. This displays the line rate in use: If the high line rate (71.1kbps) is selected then the display is: S > 64K Rate Note : This is the only rate available with G.703 Interface. If double line rate (142.2kbps) is selected then the display is: S > 128K Rate Note : Not available with G.703 Int

• ATL AM64/128A, Constructional Details AM64/128A User Manual 6 2. CONSTRUCTIONAL DETAILS 2.1 Baseband Modems The BBM is housed in a black plastic case. On the front panel there is a menu driven LCD display with six keys and five LED's. On the back panel there is a 3- pin IEC mains inlet socket, an input voltage selector switch (230V/120V), a 6-way - 4-loaded RJ11 connector type line cord socket, and one data interface connector. The data interface connector type will be from one of the six user specified interfaces available. Inside the plastic case is a metal case which contains the main PCB. The metal case is for EMC screening purposes. The front panel assembly containing the LCD, the keys, and the

• ATL AM64/128A, AM64/128A User Manual Test Menu 25 5.4.6 In Service Test 5.4.6.1 Overview This mode allows the error performance of the line to be monitored, without interrupting data traffic. This works by monitoring the accuracy of some of the overhead bits that make up the transmission frame structure. As the data channel itself is not monitored, the figures produced cannot accurately be extrapolated to give the data error rate, but can be used as a general guide. In order to understand this feature better, an understanding of the transmission frame structure is required. This is inc

• ATL AM64/128A, AM64/128A User Manual System Overview 8 The interface circuit performs a number of functions : it converts between the user data from the appropriate interface and the 64kbps or 128kbps, which is transmitted down the line; it links the control circuit to the control channel; it interfaces the control circuit to the control lines of the data ports. Again, these functions are performed by a custom IC supported by a number of standard components. Looking at each function in turn, user data at 64kbps and 128kbps is sent without processing; byte-timing is maintained by the transmission system and is available if required. Data at 56kbps is sent in a 7+1 format, i.e. data plus status informa

• ATL AM64/128A, AM64/128A User Manual Configuration Menu 35 5.7.4.1 Synchronisation Type (for software version V1.3 and above) With these later versions of software, there are three possible options depending upon which interface is fitted, whether Master or Slave mode is selected, and the rate selected. Option 1 - C > Ext Byte Clk This option is shown when the ‘External Byte timing ON’ is selected. The Master unit accepts Byte timing from external timing input (S EXT) and uses this to synchronise the link with its remote Slave unit. or Option 2 - C > Ext Bit Clk This option is shown when the ‘External bit t

• ATL AM64/128A, Menu Operation AM64/128A User Manual 12 5. MENU OPERATION 5.1 Front Panel Features The Baseband Modem has an uncluttered and easy to understand front panel. It has a liquid crystal display (LCD), 5 LED’s, and 6 non-locking keys. With the 16 character alphanumeric, dot-matrix liquid crystal display it is possible to describe most of the functions in plain English, thus avoiding having to use complicated mnemonics and the need to constantly refer to a hand book. The 6 front panel keys are as follows:

• ATL AM64/128A, AM64/128A User Manual Appendix B – Internal Link Settings A-6 Interface Modules X.21 Interface Module: J1 - X.21 T (Transmit data) Circuit Termination – This link connects a 120 ohm load resistor across the T circuit position 1-3. This helps maintain signal rise times and minimises reflections at rates greater than 9.6 kbps over long lines. At lower rates and over short lines the termination resistor may be omitted, (link set position 1-2). J2 – X.21 SEXT (External Signal Element Timing) Circuit Termination – This link connects a 120 ohm load resistor across the SEXT circuit i

• ATL AM64/128A, Appendix F - Troubleshooting AM64/128A User Manual A-16 In some environments, the external timing input (SEXT on X.21 or circuits 113 on the X.21 bis interfaces) of an AM64/128A set in Master Mode may become sensitive to external coupled noise. This may have the effect of pulling the modem’s VCO (internal oscillator) off to one side and causing a normal Master to Slave Baseband link to lose synchronism. It is recommended that, if the external timing input of the modem is not to be used, these inputs are di

• ATL AM64/128A, Menu Operation - Option Menu AM64/128A User Manual 32 5.6.6 Character Length Scrolling down further gives the display: O > Char Len: 8 Pressing SELECT changes the length between the four options, 8, 9, 10 and 11 bits. The character length sets the total character length including one start bit, one stop bit and possible parity bit. Pressing SELECT then gives: O > Char Len: 9 or O > Char Len: 10 or O > Char Len: 11

• ATL AM64/128A, AM64/128A User Manual Appendix A - Interface Connections A-3 25 Way D-type RS-530 Connector pin allocation *Standards dictate that the control circuit 107 may be implemented as a balanced circuit (using both A and B wires) or as an unbalanced single ended circuit. In the AM64/128A, circuit 105 is implemented as a balanced circuit and 106,107,109 are unbalanced. To allow inter working between balanced and unbalanced circuits, the A wire is to be used and the B wire is to be joined to GND (circuit 102) at the receiver end of the circuit. 9 Way D-type (64 kbps, 120 Ohm) Codirectional Connector pin allocation Line Connector The modem comes packed with a 6-way, 4-

• ATL AM64/128A, Menu Operation - Test Menu AM64/128A User Manual 18 5.4 Test Menu 1. Local loop 2. Loop back 3. Remote loop 4. Binary pattern 5. Data error test 6. In service error test 7. Lamp test 8. Self Test 9. Comms channel loop 5.4.1 Local loop This is a loop applied within the local BBM. It loops data back to the DTE from a point as close to the interface connector as possible. This loop can be applied in two ways (1) From the Menu. (2) Direct from the DTE - see section 5.4.1.2. 5.4.1.1 Local loop from menu The top level display shows T > Loc Loop Off Pressing SELECT

• Glossary AM64/128A User Manual 38 V.24 CCITT specification. List of definitions for interchange circuits between DTE and DCE. V.28 CCITT specification. Electrical characteristics for unbalanced double-current interchange circuits. (V.28 Interchange circuits defined in V.24) V.35 CCITT specification. Data transmission at 48kbit/s using 60-108kHz group band circuits. V.36 CCITT specification. M

• Menu Operation - Option Menu AM64/128A User Manual 30 5.6 Option Menu This menu displays the type of DTE interface currently fitted in the BBM. The AM64/128A automatically “reads” which interface type is fitted on power up, and programs certain options accordingly. The first two display options are read only. These display the following information: (1)

• ATL AM64/128A, Test Menu AM64/128A User Manual 20 With a G.703 interface fitted, the application of a loopback will apply a loopback to line at the remote slave unit (known as an LTU loop on the G.703 linecard and standalone units). Note : It is not possible to “Hardwire” a G.703 loop at the G.703 interface connector. 5.4.3. Remote Loop Remote loop involves turning on a BBM loopback, but from the other end of the link (see figure 5.4.3). This can only be menu activated from a BBM with a X.21bis interface. It is available from the DTE however, in either X.21 or X.21bis. 5.4.3.1 Remote Loop from menu On applying the

• ATL AM64/128A, Status Menu AM64/128A User Manual 14 5.3 Status Menu The status menu is read only, which means the select button has no effect. It provides the following data: (1) Overall status (2) Alarm messages (3) User data rate (4) Line rate (5) Interface status (6) Operating mode 5.3.1 Over all Status The possible messages for this item in priority order, and the conditions which set them are as follows: S > Loop Active S > LTU Not Ready S > LTU Ready S > Data Transfer S > Send Data S > Receive Data (a) If a loop is applied

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