FECO COMMS # 38

	FECO	:COMMS # 38
	Modification No	N/A
	Product	CRAY DCX818 MULTIPLEXOR
	Sub-Assembly	N/A
	Estimated Man Hours	N/A
	Class Of Change	INFORMATIONAL
	Reason For Change	TO ADVISE SETTINGS FOR SCSI I/F USING ECU TO INTRODUCE THE CRAY DCX818 MULTIPLEXOR & LIST THE STANDARD SETTINGS
	Note	FULL ESD PRECAUTIONS MUST BE TAKEN WHENHANDLING BOARDS

1. This feco is to introduce the cray DCX818 multiplexor.

2. The cray DCX818 is a 4 or 8 channel asynchronous multiplexor. It is field upgradeable from 4 to 8
        channels. It has only one composite link, which is v24. This can be converted to v11,but
        permanently disables the v24.

                 It is light grey in colour and measures approximately 16in x 9in x 2.5in.

                 See the diagram below.

                The DCX818 has a similar function to a gandalf minimux in that it is only a point to point multiplexor,
                but with the crayDCX832 multiplexor could be used as the end or ends of a daisy chain, with a
                maximum of 3 nodes.

                 (tech serv ref96/06)

3. The Mec identities are as follows.

4.  Accessing the interior

4.1 ensure the unit is disconnected from the a.c. supply.

                Ensure esd precautions are observed.

4.2. remove the 2 screws from the rear, at the top.

4.3. gently slide the complete top cover towards the front and lift off.

4.4. ensure the DCX818 is configured for the mains voltage used.

• Conventions

        Local the end of the link where you are now

        Remote the other end of the link.

        Channels numbered 1-4 or 1-8.

        When setting up:-

        * when selecting from displayed options, enter number or character of the option, followed by .

        * x is used to exit to previous menu.

        * some options require confirmation, enter y or n .

• If an error is entered, backspace and enter correct selection.

6.  configuration/supervisor

6.1. connect a vdu to any data port, set to the speed of that port.

6.2. log on by entering followed by user escape character -default is ctrl-a.

        The initial screen is displayed with instructions.

6.3. note entering at `enter password prompt' takes you into a limited set up mode only.

6.4. at `enter password prompt', enter: logon.

6.5. at `local remote manager prompt' enter l, r or m as required.

        The supervisor menu is displayed.

6.6. From the supervisor menu the required option can be selected.

6.7. To exit the supervisor menu select x, the unit responds `goodbye'.

• Channel configuration option 1 standard setting. 

7.1. select option 1 channel configuration.

7.2. enter channel number required.

7.3. select option 4 - load default setting.

7.4. select option 1 to configure all parameters, or letter to configure only one, then reset parameters as
        necessary to those below:-

a line speed 9600	B local echo off
C character code 8+1	D uso connect character off
E system messages off	F parity trans
G term.flow control dc1	H term.flow control x-off dc3 x-on
I flyback buffering off	J buff overflow prot x-on off
K buff. Overflow off	L cts to follow rts on prot x-off
M special flow none	N user escape character ctrl-a
O inactivity timer off	P parity error character *
Q host abr off	R host control monitor off(for dll)
S setup pins	T data limit 48

7.5. the line speed selection must be compatible with it's adjacent channel. Adjacent channels are
        defined as channels 1/2,channels 3/4, channels 5/6, channels 7/8.

        To determine compatible speeds for adjacent channels, select only speeds from the speed table
        below. The speeds may be identical or different.

speed table 2
(bps)
75
110
134.5
150
300
600
1200
1800
2000
2400
4800
9600
19200

 

7.6. Channel parameters may be copied to other channels using options 2 or 3.

7.7. Channels will always connect to channels at the remote end on a 1-1 2-2 3-3 basis.

7.8. to exit channel configuration enter x.

8. link configuration option 4 standard settings

8.1. select option 4 link configuration.

8.2. the composite level driver will display type of link fitted, v24 or v11. All the other link
        parameters will be displayed.

8.3. set the parameters to those listed below by selecting the appropriate letter:-

                A maintenance clock rate set to link line speed.

                V24 up to 19.2k

                V11 up to 64k

                B internal/external clockext

                C link inactivity10sd inter frame delay24ms

                Timeout

                E poll mode timeout 1sf number of channels set 4 or 8

                G data inactivity noneh sarm burst length limit none

                Timeout

                I reset interval1sj rr burst length limitnone

                K for v24

                X.21 bis interface disabled

                For v11

                Isdn interface disabled

                L extended window off

8.4. to exit link configuration enter x.

9. composite connectors

9.1. the v24 composite link terminates in a 15 way modular jackplug. An interface cable
        terminating in a 25 way d type male connector interfaces with the modem/ntu.

        Cray cable type x890-405011 for modems

                Cray cable type x818-401511 for ntu.

                The specs are shown below.

                X818-401511 x890-405011

                15 pin25 pin15 pin25 pin

                For NTU For Modems Only

Modular Jack	D Type Male	Modular Jack	D Type M
2	2	2	2
3	3	3	3
4	4	4	4
5	5	5	5
6	6	6	6
7	7	7	7
8	8	8	8
9	9	9	9
10	10	10	10
11	11	11	11
		12	22
		13	23
		14	24
		15	25

10. diagnostics/trouble shootings

10.1 fault location can be assisted by the validation local and remote loopback tests. If there is
        a fault within the DCX818 itself the front indicator will display an f and error number.

10.4 if at power-up the DCX818 fails it's diagnostics, an alternating f and an error code will be
        displayed on the front panel seven-segment display. The following list briefly explains
        each, and any possible action that can be taken to remedy the fault; however in all cases
        the unit should be reset and allowed to run the diagnostics again.

                Fault cause action

                Number(s)

                1eprom checksum incorrect replace the eproms, ug7and uj7

                2-5 soft abort fault check link lk3, swab, not shorted

                6/7set switch fault/scrl check that the switch is not pressed during the power testing.

                11-17bus error fault fatal error, reset and retry.

                18-26ram fault check that the correct issue of software is fitted reset and try again.

                27-35bram fault fatal error, reset and try again.

                52-63duart access fault fatal error, reset and try again.

                64-74duart interrupt faulten sure pal5, uj4 isfitted, reset and try again.

                75-122duart data fault fatal error, reset and try again.

                139-141dmsc access fault ensure dmsc, ub3 is fitted reset and try again.

                142-145dmsc interrupt fault fatal error, reset and try again.

                158-169dmsc data fault ensure pal6, uc2 is fitted reset and try again.

                It is possible that during the course of diagnostic testing an unexpected exception may occur.
                This will cause testing to cease and an alternating u and an exception number to bedisplayed:

                U - -

                Pressing the scrl key will cause the test number being performed at the time to be displayed in
                the format:

                U - -

                The unit should be reset and allowed to run the diagnostics again.

11. four channel expansion card upgrade

11.1 the four-channel expansion card, cray part no. X818-60111102, increases the number of
        asynchronous channels supported from four to eight. The card is supplied with four plastic
        mounting pillars (a762-280008) and two m3 retaining screws with washers. Two sets of
        d-type jacking posts are supplied, oneset for early, and one set for the late models.

11.2. before the card may be installed, access the interior, see para.4.

11.3. the channel expansion blanking panel should be removed from the inside of the rear panel
        by removing the two retaining screws and lifting the panel clear.

11.4. insert the four mounting pillars into the main card (figurec-3 below), then press the
        expansion card into the socket connector and mounting pillars.

11.5. replace the two retaining screws to secure the expansion card to the rear panel.

11.6. using a 5mm nut-spinner, fit the longer of the supplied jacking posts into each of the
        d-type connectors on the expansion card (8 posts in total).

                [using a 5mm nut-spinner, fit the shorter of the supplied jacking posts into each of the d-type
                connectors. This must be done by passing the threaded section through the holes in therear
                panel (8 posts in total).]

11.7. replace the top cover by locating it over the base and carefully sliding it into position.
        Avoid fouling the switches. Then replace and secure the two fixings.

11.8. re-fit the data cables, adding any new ones as appropriate.

11.9. re-connect the mains power and power-up the system.

11.10. refer to para. 13 for details of power-up and check out Procedures



                12v11 composite interface card upgrade

12.1. these are three types of composite interface card: v.11, v.35,and tdm. The installation
        procedure for each is identical.probably only a v11 interface card upgrade will be
        carried out.

12.2. the composite interface card is supplied complete with four plastic mounting pillars, two
        retaining screws, and the relevent composite cable.

12.3. remove the top cover as per para.4.

12.4. using a medium flat-bladed screw driver, carefully remove the two dil resistor packs from
        their sockets, ub2 and ug1, thus disconnecting composite 1. Save these and return
        to production.

12.5. the composite blanking panel should be removed from the inside of the rear panel. To do
        this remove the two retaining screws and lift the panel clear.

12.6. insert the four plastic mounting pillars as indicated infigure c-3 on the previous page, then
        press the card into socket sk7 and the mounting pillars. Replace the two retaining screws
        to secure the composite card to the rear panel.

12.7. replace the top cover by locating it over the base and carefully sliding it into position.
        Avoid fouling the switches. Then replace and secure the two fixings.

12.8. re-fit the data cables, adding any new ones as appropriate.

12.9. re-connect the mains power and power-up the system.

12.10. refer to para.13 for details of power-up and check out Procedures.

13. power up and check out procedures.

13.1. starting up the DCX818

                This section explains the sequence of events following power-up for the DCX818. Error
                situations that may arise arealso explained.

                When the DCX818 is switched on the following sequence should be observed.

                Stage 1: the hardware is diagnostically tested.

                When the DCX818 is first powered on all the front panel indicators should extinguish and a t
                should be visible on the seven-segment display. This indicates that the power-up diagnostics
                are running.

                If on power-up a p is displayed along with alternative flashing leds, the unit has entered
                production diagnostic mode. The unit should immediatley be reset by pressing both front panel
                buttons together. On releasing the buttons the unit should display t. If it does not, reset the
                unit again, ensuring that the set key is released first.

                If any diagnostic test fails, an error code is displayed on the seven- segment display. The
                format of this display is:

                F- -

                The error message will be repeated until either the system is turned off, or it is reset by
                pressing both front panel buttons together. A full description of the diagnostic error codes is
                given in para 10.4

                Stage 2: the hardware passes diagnostics

                Once all the required diagnostics tests have been performed and have passed, the DCX818 will
                indicate this by lighting all segments of the seven-segment display. Control is handed over to
                the application software.

                Stage 3: application software running

                The front panel display will now change to show the current composite link utilisation on the
                seven-segment diaplay, and the leds indicate the condition of the composite link interface. A
                lower case c is displayed on the seven-segment display if the link is down.

                It should now be possible to log on to use the DCX818 supervisor menu.

13.2. checkout procedure

                This procedure should be carried out after installing or re-configuring the DCX818 system.
                Ensure that the DCX818 has been correctly configured and connected and that it is
                disconnected from the mains power.

13.2.1 connect a terminal to channel 1 of the DCX818 with a suitable cable, usually cable
        type h. Connect to mains power.

13.2.2 log on through the supervisor terminal, see para 6.

13.2.3 set composite loopback mode.

13.2.4 set one channel into local loopback mode. Verify that the loopback has been set, and
        reset it.

13.2.5 send data form the terminal. Verify the correct operation ofthe data. If the returned
        characters do not correspond to those transmitted, then check that the terminal settings
        are compatible with those given in the channel configuration. If they are incompatible
        then either alter the terminal settings or change the configuation.

13.2.6 move the terminal to the next channel and repeat steps13.2.4 and 13.2.5 until all the
        channels have been checked.

13.2.7 reset composite loopback mode. If after 10 seconds the green led is not lit steadily, a
        fault exists between the two units (ignore the following steps, and cure the problem first).

13.2.8 validate each chanel in turn.

13.2.9 set one channel into remote loopback mode. The DCX818 will indicate if this is successful
        through the display at the supervisor terminal. Send and verify data. Perform a
        channnel reset on the channel. Repeat for all channels.

13.2.10 examine the status of each channel in turn. Each should report a port reset and
        possibly a speed mis-match error.

                This indicates that the channel speeds difer at each end of the multiplexor link (but this will not
                affect the correct operation of multiplexers). If any other errors are reported the refer to para.
                10.3.

14. front panel features

14.1 the DCX818 front panel controls and indicators, shown below, comprise nine led indicators,
        a 7-segment indicator and two push buttons.



                Figure 1-3 818 front panel

                These controls and indicators allow the supervisor to perform configuration, control, monitoring
                and diagnostics functions. from the front panel you can:

                * reset channel configurations and the password to default values.

                * monitor port control and data singnal states.

                * validate and perform loopback errors.

                * identify and clear local errors.

                * perform a hardware reset of the unit.

14.2. controls and indicators

                The set and scrl (scroll) push buttons are used in various sequences to step through the
                monitoring, control and diagnostics functions availble on the panel.

                The term `press' is used to mean depressing and releasing the button once. `pulse' is used to
                mean depressing and releasing the button a number of times until the stated result occurs.

                Progress through the sequences and the status of the functionsis monitored on the 7-segment
                indicator. Additionally, this indicator has a dot in its lower right corner to indicate loop backs
                and errors in the unit.

                Front panel controls and indicators are disabled whenever a supervisor logs on from a terminal.
                This is indicated by the7-segment indicator displaying s.

14.3. channel monitoring

                The individual leds on the front panel indicate a selected channels low speed data and interface
                control conditions. To monitor a channel when a channel number is already displayedon the
                7-segment indicator, pulse the scrl push button to moveto the desired channel. If a channel is
                not displayed, follow the procedure below:

                A. Pulse the scrl push button until the 7-segment indicator displays a large capital c
                (for channel).

                B. Press the set push button once. The 7-segment indicator displays the last channel previously
                selected.

                C. Pulse the scrl push button to move to the channel number of interest (after 4/8, the display
                returns to 1). When reached,the leds display current conditions on that channel.

                Indicatons of the monitored channel update automatically as conditions change.

                The leds have the following meanings:

                Cts/drs depending on the selection of `control leds display' on the next page.

                Ri/bo these leds will show the status of either the four incoming or the four outgoing

                Dcd/rts

                Dsr/dtrv.24 controls

                Txd transmitted data is on from local dte

                Rxdreceived data is on to local dte

14.4. front panel operation

                There are six main indications on the 7-segment indicator that can be scrolled through in a
                continuous loop with the scrl push button. These indications can be considered as gateways
                to the functions they represent:

                C channel diagnostics, the gateway to channel loop backs,validation and port reset.

                E error, the gateway to error location, identification and elimination.

                P password reset, the gateway to password reset.

                D default configuration reset, the gateway to default value resets.

                C control leds display, the gateway to select whether input or output v.24 signals are displayed
                on the leds.

                H high speed (arq) features.

                A route map to front panel operation state, showing the action of the scrl and set push buttons
                on the 7-segment indicator, is shown on the previous page.

                When the DCX818 module is powered up, the indicator will showa 1, which is channel 1. In
                normal operation it will probably indicate a channel number, 1 to 4/8.

                Reference to the previous page shows that to carry out a function on the displayed channel,
                you first press set (displays u, validate) then pulse scrl to obtain l, r, a or f.alternativly, to
                access another channel, pulse scrl first.

                To obtain c, the channel gateway, press scrl from f.

                From c you can pulse scrl to obtain e,p,d,c or h, and any of them press set to access their
                functions.

                The following indications, when present, cannot be scrolled off the display:

                S supervisor logged on. When the DCX818 is accessed by a supervisor connected to one of the
                channels, the front panel controls are locked out. If these controls are in use when a supervisor
                logs on, front panel operations are suspended for the duration of the supervisor access.
                Unless they were modified by the logged-on supervisor, the front panel operations are restored
                to their previous state when the supervisor logs off. The only exception is the hardware reset
                obtained by pressing both buttons simultaneouly.

                F fault exists on the unit. If this should occur, refer to para.10

15.isdn operation

15.1it may be more cost effective for a low volume user to connect their multiplexor via an isdn
        terminal adapter and "dial up"each time the link is used.

                The DCX818 is set to raise dtr ion its composite output whenever any data is fed into any of
                the data channels. The terminal adapter (ta) recognises the raised dtr and will dial the
                preprogrammed number, making the link. The connection time is almost instantaneous and
                the "join" will almost be invisible to the operator. After a preset time without data flow, the link
                is dropped. This is repeated as necessary.

15.2 all the data channels are to be set up as standard.

15.3 set up for case DCX818 with v24 composite interface.

15.3.1 from main menu select option 4 link configuration.

                Set the parameters to those listed below by selecting the appropriate letter:-

                A maintenance clock rate set to link line speed.

                V24 up to 19.2k.

                B internal/external clock ext

                C link inactivity 10sd interframe delay 24ms

                Timeout

                E poll mode timeout 1sf number of channels set 4 or 8

                G data inactivity 10sh sarm burst length limit none

                Timeout

                I reset interval 5sj rr burst length limit none

15.3.2 select option k x21bis interface

                Select option 4- protocol operation

                Select a enable

                Confirm action y

                Select option 2- default configuration

                Confirm action y

                Select option 1- custom configuration

                Set the parameters to those listed below by selecting the appropriate letter:-

                A outbound timeout 4s

                B connect delay 2s

                C inbound error timeout 4s

                D inbound failure timeout10s

                E protocol timeout10s

                F signal 106 delay50ms

                G disconnect timeout 4s

                H disc. Failure timeout10s

                I reconnect delay1-6s

                J reattempt delay60s

                K maximum reconnects 5

                L maximum reattempts25

                Exit custom configuration and confirm action y

                Exit x21bis interface

                Exit link configuration

15.3.3 from main menu select option 7- system administration

15.3.4 select option 7- system reset

                Select yes

                Confirm action y

                Do not exit from configuration / supervisor yet.

15.4 ensure the ta is correctly configured for the type of ta useda nd connected to the
        DCX818, powered on, and connected to the isdn line connector.

15.5 on the screen exit from the configuration/supervisor facility completely.

                This resets the DCX 818 system.

15.6 on completion of the reset the DCX818 will raise dtr to establish the initial link up.

                Once established, the link will be dropped after the timeout period.

15.7 normal operation can then continue.

15.8 if the initial link up does not occur successfully, retriesare attempted. A total of 5 attempts
        are made, then a wait of 60 seconds before repeating the 5 attempts. This will continue
        for 25 minutes after which an error state is set. An incoming call or system reset is
        needed to reset the error state. A system reset is shown in para.15.3 or you can press
        and release both DCX818 front panel switches simultaneously..

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