CRAY DCX832 MULTIPLEXOR

FECO COMMS # 39

	FECO:	COMMS # 39
	MODIFICATION No:	N/A
	PRODUCT:	CRAY DCX832 MULTIPLEXOR
	SUB-ASSEMBLY	N/A
	ESTIMATED MAN HOURS	N/A
	CLASS OF CHANGE:	INFORMATIONAL
	REASON FOR CHANGE:	TO INTRODUCE THE CRAY DCX832 MULTIPLEXOR &

List the standard settings

1. This feco is to introduce the cray DCX832 multiplexor.

Some of these are already installed on site.

2. the cray DCX832 is an 16/32 channel asynchronous statistical multiplexor. It is field upgradeable from 16 to 32
channels. It has two composite links, composite 1 which is v24/v11/v35 configurable link, and composite 2
which is a v24 link.

The front panel has 8 led indicators, 2 line 32 character LCD display, 7 push button controls and an 8 pin
supervisor jack.

It is light grey in colour and measures approximately 17in x13in x4in.

See the diagram below.

The DCX832 has a similar function to a gandalf smux, and can be used in a network with a maximum of 3
nodes. The DCX832 is the next level up from the DCX818.

(tech serv ref96/07)

3. the mec identities are as follows.

16 channel cray-DCX832-16

32 channelcray-DCX832-32

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 3 screws from the rear, at the top.

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

4.4. ensure he 832 is configured for the mains voltage used.

5. conventions

Local the end of the link where you are now

Remote the other end of the link.

Channels numbered 1-16 or 1-32.

When setting up

* selecting from displayed options, enter number or character of options, follows by .

* x is used to exit to previous menu.

* some options require confirmation, enter y .

* 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 m1 or m2 as required.

The supervisor menu is displayed as shown below

Note: m1 and m2 are to be used to access the supervisor at remote ends when there are 3 nodes
connected together.

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'.

7. 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 speed9600b local echooff

C character code8+1d uso connect characteroff

E system messagesofff paritytrans

G term.flow controldc1h term.flow control x-offdc3

X-on

I flyback bufferingoffj buff overflow prot x-onoff

K buff. Overflowoffl cts to follow rtson

Prot x-off

M special flow nonen user escape characterctrl-a

Control

O inactivity timeroffp parity error character*

Q host abr offr host control monitoroff

(for dll)

S setup pinst data limit48

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; etc.

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

Speed table 1 speed table 2

(bps) (bps)

50 75

110 110

134.5 134.5

200 150

300 300

600 600

1200 1200

2400 1800

4800 2000

7200 2400

9600 4800

9600

19200

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

7.7. to exit channel configuration enter x.

7.8. the mapping should be set up next.

8. mapping

8.1. mapping is the interconnection between channels on the local and remote units and does not have to be
        1-1 2-2 etc, although this is easiest to do. There are two maps- map 1 and map 2 which can be different.
        The maps are also designated active and edit. You can only change the edit map, not the active one. If
        you wish to change the active map, you must first make it the edit one.

8.2. a sample map display is as follows.

View mapmap 1

Dev.chn:dev.chndev.chn:dev.chndev.chn.dev.chn

0.1: 2.10. 9: 1.51.1 0. 5

0.2: -.-0.10: 1.61.2 2. 2

0.3: 2.30.11: 1.7 1.3 0. 7

0.4: 2.40.12: 1.81.4 0. 8

0.5: 1.10.13: -.-1.5 0. 9

0.6: -.-0.14: -.-1.6 0.10

0.7: 1.30.15: -.-1.7 0.11

0.8: 1.40.16: -.-1.8 0.12

1.9:manager

Dev.chn.dev.chn

2.1: 0.1

2.2: 1.2

2.3: 0.3

2.4: 0.4

2.5:manager

8.3. the above mapping shows a DCX832 connected to a 4ch DCX818 on composite 1 and an 8ch DCX818 on
composite 2.

8.4. channel connections are as follows as::

DCX832 DCX818 4 port	DCX818 8port
1	1
3	3
4	4
2	2
5	1
7	3
8	4
9	5
10	6
11	7
12	8

I.e. one channel is mapped through the 832 connecting the channel 2's of both 818's together.

Notice that this reduces the number of available channels on the 832, channels 2 and 6.

8.5. load map default.

8.6. Change the required map for your network as necessary.

8.7. To exit mapping, enter x.

9. link configuration option 4 standard settings.

9.1. select option 4 link configuration.

9.2. select device 1 or 2 for composite 1 or 2.

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

A maintenance clock rate set to link line speed up to 76.8k

B:link inactivity 10s

Timeout

C: interframe delay24msd: poll mode timeout 1s

E: number of channelsf: interface type

V24/v11/v35

G: data inactivity noneh: sarm

Timeout limit

I: reset interval1sj: rr burst length limit none

K: x.21bis interface disabledl: extended window off

M: data limit48

9.4. to exit link configuration enter x

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
DCX832 itself the LCD indicator will display an error number.

11. power up and check out procedures.

11.1. starting up the DCX832

This section explains the sequence of events following power-up for the DCX 832. Error situations that may
arise are also explained.

When the DCX832 is switched on the following sequence should be observed.

All v24 led's light up.

All v24 led's go out and the LCD shows:-

Loading DCX832

The LCD shows:-

Power-up diagnostics

The DCX832 cycles through it's tests. If these pass then within 10 seconds the LCD will display:-

Diagnostics passed.

11.2. checkout procedure

This procedure should be carried out after installing or re-configuring the DCX832 system. Ensure that the
DCX832 has been correctly configured and connected and that it is disconnected from the mains power.

11.2.1 connect a terminal to channel 1 of the DCX832 with a suitable cable, usually cable type h. Connect to
mains power.

11.2.2 log on through the supervisor terminal.

11.2.3 set composite loopback mode.

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

11.2.5 send data from the terminal. Verify the correct operation of the local channel by monitoring the received
        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 configuration.

11.2.6 move the terminal to the next channel and repeat steps 11.2.4 4 and 11.2.5 until all the channels have
been checked.

11.2.7 reset composite loopback mode.

11.2.8 validate each chanel in turn.

11.2.9 set one channel into remote loopback mode. The DCX832 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.

11.2.10 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 differ 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.

12. front panel features

12.1 the DCX832 front panel controls and indicators, shown below, comprise 8 led indicators, an LCD indicator
and two pushbuttons.

DCX832 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.

12.2. controls and indicators

.monitor channel and composite link utilisation.

.monitor current and peak composite link utilisation.

.perform channel diagnostics including validation,local loopdack, remote loopback, channel reset, and `fox'
test messages.

.identify and clear local errors.

.access all the supervisors facilities from a terminal connected to the front panel connector.

.force supervisor loggoff.

.display supervisor logon with device and channel.

12.2. controls and indicators.

        The seven pushbuttons are used to step through the diagnostics, monitoring, and control functions
        available on the front panel. Progress through the various sequences is monitored on the LCD. Front panel
        controls and indicators are disabled whenever the unit is accessed by an online supervisor or disabled via
        administration menu 7, sub-menu 7. An online supervisor access is indicated on the LCD by the display
        supervisor set.

Device:xchan:n

Where x = the device number, and n = the channel number.

12.3. front panel operation

The seven front controls and the LCD provide access to the features of the DCX832 without the use of a
terminal. Front panel access to those features is described in this section.

        Some of the function accessible from the front panel include channel diagnostics, validation, loopbacks,
        resets and the `fox' test pattern. A channel can be interrogated for errors in parity, framing, buffer overflow
        and lost data. Default parameters can also be loaded to a channel. The composite link functions include
        loopback, peak and current utilisation. Resets can also be selected.

12.3.1 LCD indications

The top line of the LCD displays the global state selected: composite, administrating or channel. The second
line identifies the functions selected, such as a loopback.

        The last character position on the top and bottom lines are used to indicate additional information. An
        asterisk is displayed on the end of the top line if there is an error on one of the channels. An asterisk on the
        end of the bottom line indicates that a loopback condition exists.

12.3.2 pushbutton controls

The tens and ones pushbuttons are used to scroll through the multiplexor channels.

The tens pushbutton scrolls through the channels in increments of ten. The progression is: channels 1, 10,
20, 30. It is also used to select the global state, composite link, administration or channel. See figure 9-1.

The ones pushbutton scrolls through the channel numbers one at a time.

        Using the ones and tens pushbuttons sequentially, you can select any channel. As an example, to reach
        channel 24 (from channel 1), press the tens pushbutton twice to display 20, then press the ones button
        four times to reach 24.

After the channel/link is selected, the four arrow pushbuttons (up, down, left and right) are used to scroll
through the function menus in a fixed sequence shown in the illustration.

The up and down pushbuttons provide scrolling through the various features available on each channel.
The left and right pushbuttons select function details.

The set pushbutton activates the selection made with the four arrow keys .

        As an example using these pushbuttons, assume that a local loop is wanted on channel 3. First use the up
        and down arrows to display diagnostics. Using the left and right arrows, reach loopback. Then press the
        ones button until channel 3 is displayed. Finally, press set to activate the loopback.

Some administrative functions can also be performed. These include password reset and load system
defaults. Pressing the left and right arrows simultaneously causes a system reset.

Figures 9.2 to 9.7 will show the action of the seven pushbuttons on the LCD display while the multiplexor
is stepped through it's various administrative and diagnostic functions.

12.4 forced supervisor loggoff

Pressing the set button whilst a supervisor is logged on will produce the following LCD display accompanied
by six audible notes:

Force super off

Confirm with:>

        Pressing the right arrow key will produce two further audible notes and forcibly log the supervisor off. Any
        configuration changes made by the supervisor will be saved and the supervisor terminal will receive the
        following message:

Supervisor forcibly logged off from front panel

Goodbye

Pressing any key other than the right arrow will still produce the two audible notes, but will leave the
supervisor connection intact.

12.5 figures 9-2 to 9-7 show the pushbutton actions.

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