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MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR

Sub-channel connection cables depend on application: a port (“straight-

through”) cable is generally used to connect the Mux to a DTE, and a modem
(“crossover”) cable is used to connect the Mux to a tail-end modem (see
Figure A-1).

Figure A-1. Typical Sub-Channel Cable Wiring.

1
2
3
5
6
7
4
8

CHASSIS GND

CTS

DSR

SIGNAL GND

RTS

DCD

DTR

1
5
3
8

7
2
4
6

SUB-CHANNEL

CONNECTOR

RJ-45

PIN-OUT

DTE

CONNECTOR

STRAIGHT-THRU

(PORT) CABLE

1
3
2
5

7
8
4
6

CHASSIS GND

CTS

DSR

SIGNAL GND

RTS

DCD

DTR

(1)
(5)
(3)
(8)

(7)
(2)
(4)
(6)

SUB-CHANNEL

CONNECTOR

RJ-45

PIN-OUT

MODEM

CONNECTOR

CROSS-OVER

CABLE

1
2
3
5
6
7
4
8

CHASSIS GND

CTS

DSR

SIGNAL GND

RTS

DCD

DTR

1
5
3
8

7
2
4
6

SUB-CHANNEL

CONNECTOR

RJ-45

PIN-OUT

DTE

CONNECTOR

STRAIGHT-THRU

(PORT) CABLE

1
3
2
5

7
8
4
6

CHASSIS GND

CTS

DSR

SIGNAL GND

RTS

DCD

DTR

(1)
(5)
(3)
(8)

(7)
(2)
(4)
(6)

SUB-CHANNEL

CONNECTOR

RJ-45

PIN-OUT

MODEM

CONNECTOR

CROSS-OVER

CABLE

NOT CONNECTED

Flow Control X-ON/X-OFF or DTR/DSR.

Flow Control X-ON/X-OFF or RTS/CTS.

Содержание MX870A

Страница 1: ...2 S 1 CUSTOMER SUPPORT INFORMATION Order toll free in the U S Call 877 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746...

Страница 2: ...perated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measur...

Страница 3: ...cante 7 El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo des...

Страница 4: ...caso de existir una antena externa deber ser localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo...

Страница 5: ...4 MINIATURE 2 CHANNEL STATISTICAL MULTIPLEXOR TRADEMARKS The trademarks mentioned in this manual are the sole property of their owners...

Страница 6: ...Jumpers 14 4 4 Cable Connections 17 4 4 1 General 17 4 4 2 Sub Channel Connections 17 4 4 3 Main Composite Channel Connection 17 4 5 Power On Procedure 17 4 6 Configuration Information 17 4 7 Startin...

Страница 7: ...Screen 38 4 30 Remote Multiplexor Configuration Screen 39 4 31 Examine Remote Multiplexor Configuration Screen 40 4 32 Save in Local Multiplexor Screen 40 4 33 Transfer Configuration from Local to Rem...

Страница 8: ...Diagnostics 48 6 1 General 48 6 2 Description of Test Loops 49 6 2 1 Local Loops 49 6 2 2 Remote Loops 50 6 2 3 Modem Loops 51 Appendix A Functional Interface Specifications 52 A 1 Main Composite Chan...

Страница 9: ...ture 32 to 122 F 0 to 50 C Humidity Up to 95 noncondensing Size 0 9 H x 2 1 W x 4 3 D 2 2 x 5 3 x 11 cm Weight 3 3 oz 90 g 1 2 Sub Channel Configuration DCE Number of Sub Channels 2 Data Rate 300 to 1...

Страница 10: ...ransmission Format Synchronous external timing Data Rate Up to 19 2 kbps Connector 1 DB25 female Control Signals RTS CTS DCD DTE analog loopback pin 18 remote digital loopback or signal quality pin 21...

Страница 11: ...inal connected to one of the Multiplexor sub channels The terminal communication parameters must match the parameters of the selected sub channel If you do not know what these parameters are or you ju...

Страница 12: ...the form given at the end of the appendix Keep the filled up form for reference IMPORTANT Each configuration change takes effect immediately Each time you change one of the communication parameters of...

Страница 13: ...ntrol DTR and several software flow control characters are available The Multiplexor provides for full system configuration including configuration downloading from the local Multiplexor to the remote...

Страница 14: ...c statistics and allowable delay The composite data is sent via modems to the remote Multiplexor where it is demultiplexed and distributed to the local users at their nominal rate that may differ from...

Страница 15: ...Multiplexor models will operate properly in any ambient conditions suitable for operation of electronic computer equipment and peripherals Multiplexors however can operate without performance degradat...

Страница 16: ...lost and it is therefore not possible to enter the configuration mode in the NOR mode To avoid this inconvenience always keep a record of the last configuration parameters a typical record form is sh...

Страница 17: ...no longer have control of the modem remote loopback function from the diagnostics screen Factory setting is OFF 3 TXCLK jumper JP2 This jumper enables checking of TXCLK main channel The jumper has tw...

Страница 18: ...r connection to a synchronous modem that is capable of providing the clock signal that determines the Multiplexor s composite channel data rate Appendix A also lists the pin allocation for the main co...

Страница 19: ...mand terminal using the Multiplexor configuration program For those already familiar with the Multiplexor there is a Quick Start Guide in Chapter 2 This section provides an outline of the configuratio...

Страница 20: ...ept those used letters as X ON and X OFF control characters 2 X ON CONTROL When using software 11H DC1 11H CHARACTER flow control causes 12H DC2 the receiving terminal 13H DC3 to start data transfer 1...

Страница 21: ...ne sub channel data frame Even None 4 STOP BITS Number of stop bits 1 1 5 2 1 in sub channel data frame 5 MUX TO DTE Controls software flow On On SOFTWARE control function at the Off FLOW local end of...

Страница 22: ...t accept invalid entries For example if the program expects a numerical entry in a certain range and you press a key outside this range the program ignores your entry and waits for a valid response Af...

Страница 23: ...ROGRAM The configuration program requires the user to enter a password before proceeding any further If you enter an incorrect password the Multiplexor immediately returns to start again the configura...

Страница 24: ...OR IS IN NORMAL MODE You must repeat step 1 again 5 If the password is accepted the Multiplexor sends the main menu MAIN MENU 0 SYSTEM CONFIGURATION 1 SUB CHANNEL 1 CONFIGURATION 2 SUB CHANNEL 2 CONFI...

Страница 25: ...rogram Index Menu Data Entry Screen Page MULTIPLEXOR MAIN MENU SYSTEM CONFIGURATION Menu X ON CONTROL CHARACTER Screen X OFF CONTROL CHARACTER Screen MODIFY PASSWORD Screen SUB CHANNEL 1 2 CONFIGURATI...

Страница 26: ...ultiplexor SYSTEM CONFIGURATION Menu REMOTE SUB CHANNEL 1 2 SYSTEM CONFIGURATION Screens ACTIVATE REMOTE Multiplexor CONFIGURATION Screen 4 9 Main Menu Purpose Select the configuration task to be carr...

Страница 27: ...rious test loops that can be controlled by the Mux see Section 6 2 4 EXIT TO NORMAL OPERATION Ends the current configuration session Procedure To select a configuration task type the corresponding cod...

Страница 28: ...h to the corresponding screen Type Q to return to the main menu 4 11 X ON Control Character Screen View the character currently used to start data transfer when using software flow control and select...

Страница 29: ...s Screen Select a new password The new password is activated after its verification The screen prompts you to enter the new password any two characters except the characters serving as X ON and X OFF...

Страница 30: ...umbers 1 through 8 list the various sub channel parameters that can be changed 1 Sub channel baud rate 2 Number of data bits in sub channel data frame 3 Type of parity used in sub channel data frame 4...

Страница 31: ...uration described in Section 4 3 and start again After completing the required actions type Q to return to the SUB CHANNEL CONFIGURATION screen 4 16 Data Bits Screen View the current number of data bi...

Страница 32: ...e After completing the required actions type Q to return to the SUB CHANNEL CONFIGURATION screen 4 18 Stop Bits Screen View the current number of stop bits used by the sub channel and select if desire...

Страница 33: ...data flow control and the Multiplexor can be programmed to use this capability by selecting the ON option on this screen If the DTE cannot recognize the X ON and X OFF characters the OFF option must b...

Страница 34: ...ommands for the remote DTE connected to it When an X OFF command is received from the local DTE the local Multiplexor interrupts immediately the transfer of received data to the local DTE The addition...

Страница 35: ...Multiplexor monitors the DTR line contained in the local sub channel RS 232 interface and transmits the status of this line to the remote Multiplexor The remote Multiplexor then supplies to the DTE co...

Страница 36: ...nal requires DCD to be active in order to communicate you must establish communication with the remote Multiplexor before starting a configuration session Screen selections are as follows Code numbers...

Страница 37: ...ops Code numbers 0 through 2 list the available local loops composite loop and loops for each sub channel Code Q is used to return to the DIAGNOSTICS screen The CURRENT STATE line shows the current st...

Страница 38: ...e control screen for any of these loops Its functions are similar to those of the LOCAL LOOPS screen 4 27 Loop Control Screens Change the current status of the test loop selected on one of the loop se...

Страница 39: ...mote Mux configuration prepared FROM LOCAL TO on the local Mux to the remote Mux REMOTE 3 PREPARE REMOTE Used to initiate preparation of remote Mux MULITPLEXOR configuration using the terminal connect...

Страница 40: ...abort the operation by pressing Q this will return you to the REMOTE MULTIPLEXOR CONFIGURATION menu 4 30 Remote Multiplexor Configuration Screen Define the action to be performed on the information re...

Страница 41: ...tiplexor as you instructed by selecting item 1 on the REMOTE MULTIPLEXOR CONFIGURATION menu NOTE The remote configuration does not override the local configuration it is only stored for receiving and...

Страница 42: ...hout seeing the acknowledgment message by pressing Q this will return you to the REMOTE MULTIPLEXOR CONFIGURATION menu while configuration transfer is being performed 4 34 Prepare Remote Multiplexor C...

Страница 43: ...4 37 Activate Remote Multiplexor Configuration Provide an indication that the remote Multiplexor has activated its new configuration after selecting item 4 on the REMOTE MULTIPLEXOR CONFIGURATION menu...

Страница 44: ...le 5 1 Multiplexor Controls Indicators and Connectors Item Control Indicator or Connector Function 1 POWER Indicator Lights when the Multiplexor is powered 2 DATA Activity Indicators Indicators one fo...

Страница 45: ...received by the remote Mux 4 OVF Indicator Lights when Mux buffers are full In a properly designed system this condition usually indicates that one of the DTE units connected to the Mux does not resp...

Страница 46: ...ghts continuously Check that after a few seconds during which Multiplexor performs its self test the OVF indicator is extinguished 5 2 3 NORMAL OPERATION During normal operation the PWR when present S...

Страница 47: ...ultiplexor Indications No Indication Probable Cause Action 1 TEST lit Mux in Check whether the Mux is being command mode configured and wait until configuration is completed at any time only one sub c...

Страница 48: ...ion and the Mux flow control is properly configured 4 One or more No traffic on If traffic is expected but no activity is sub channel sub channel indicated check DTE equipment and indicators are its c...

Страница 49: ...em Loops 1 Analog loop 2 Remote digital loop option depends on the characteristics of the modem used for the composite channel as explained in Section 4 3 The various test loops are identified in Figu...

Страница 50: ...not this indicates a local Multiplexor problem Sub channel activity indicators light according to traffic the lighting of the OVF indicator means that Multiplexor buffers are full because of flow cont...

Страница 51: ...munication link For example intermittent flashing of the SYNC indicator indicates high error rate on the link Sub channel activity indicators light according to traffic the lighting of the OVF indicat...

Страница 52: ...cal Multiplexor performed satisfactorily on the local composite channel loop indicates a problem in the composite channel connection cable and or in the local modem 2 Remote digital modem loop When th...

Страница 53: ...to Section 4 3 102 AB 7 Signal Ground Common signal and DC power supply ground 103 BA 2 Transmit Data Serial digital transmit data from the Mux 104 BB 3 Receive Data Receive data from modem 105 CA 4...

Страница 54: ...nuously until synchronization with the remote Mux is established 140 21 Loop 3 Test Command Control signal from Mux to modem Positive level commands the attached modem to send a remote loopback comman...

Страница 55: ...provided by Mux receiver 105 CA 2 Request to Send Received by Mux from DTE controls DCD at remote side 106 CB 8 Clear to Send A positive level from the Mux indicates that the terminal is allowed to se...

Страница 56: ...NECTOR RJ 45 PIN OUT DTE CONNECTOR STRAIGHT THRU PORT CABLE 1 3 2 5 20 7 8 4 6 CHASSIS GND TD RD CTS DSR SIGNAL GND RTS DCD DTR 1 5 3 8 7 2 4 6 SUB CHANNEL CONNECTOR RJ 45 PIN OUT MODEM CONNECTOR CROS...

Страница 57: ...Form Date ___________________ Prepared by ____________________ Location _______________ Far Location ____________________ Multiplexor Serial No Local_________________ Remote_________________________...

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