Digital Equipment DEC WANcontroller 622 Instruction sheet

Problem Solving
DEC WANcontroller 622
Part Number: EK–A0550–PS.001
Digital Equipment Corporation. 1992. All Rights Reserved.
1

Users are referred to
these cards if there is
apossible problem
with the line card and
its components.
DEC Network Integration Server Problem Solving
DECNIS Problem Solving Manuals
Network Interface Card (NIC) Problem Solving cards: are supplied with each NIC.
ThecardsoutlineproceduresforcheckingpossibleproblemswithNICs, theircables,
distribution panels and modems. Start problem solving with the flowchart.
DECNIS Installation and Service Manual: includes a problem solving section which
outlines procedures for checking hardware problems.
Loopback Connectors
DNSXT–CA
H3198
H3250
Part Number
DEC Network Integration Server Problem Solving: outlines NCL commands for
checking software problems.
DEC Network Integration Server Event Messages: this is an on-line text
file. Thefilelistseventmessagesthatcanindicatefaultswithhardwareand
software. The event message describes the meaning of each event and
what action to take.
50-way loopback connector (male)
V.36/V.11, EIA-422
V.35
Loopback Connector
NIC
Adapter cable and
extension cable
Component
Kilostream is a registered trademark of British Telecommunications,plc.
There is no loopback test for X.21 leased line or BT Kilostream. If you are unable to
solve your problem, contact Digital Services.
Note for X.21 leased line and BT Kilostream
LKG–5721–91I

2

NIC LED States
Slow flash
Fast flicker
READY
HOTSWAP
FAULT
ATTENTION
The LED display shows the state of the NIC when the module self-test
orsystemself-testwaslastrun:seetheInstallationandServiceManual
for your DECNIS for more details.
Module self-test in progress.
TheNICiseitherwaitingtoloadoris load-
ing software.
The NIC has passed its module self-test
andhassuccessfullyloadedthesoftware.
The NIC is disabled.
(The NIC switch is set down.)
The NIC has failed its module self-test.
The NIC is partly working.
You can continue to use working port(s),
butyoumustisolateandreplacethefaulty
component as soon as possible.
Aflickering RUN LED indicates
that the NIC software is waiting
to load.
flash
flicker
flash
LKG–5722–91I
3

For details of tests and procedures, refer to the panel with the matching flag (see overleaf).
D
or ATTENTION FAULT
Yes
Test
successful?
(READY state)
No
There is a possible problem
with the NIC.
D
Replace the adapter cable.
Yes
No
Yes
Yes
No
Load
successful?
The problem was a loose
cable connection.
C
There is a possible problem
with the extension cables.
D
There is a possible problem
with the NIC.
A
Perform a module loopback
test on the NIC.
Yes
Test
successful?
No
Yes
No
Check the local modem
and remote connections –
see DEC Network Integration
Server Problem Solving.
D
Replace the section of cable
that failed the test.
Check the LED display on
the processor card, then see
the Installation and Service
Manual for your DECNIS.
LKG-5730-91I
Do
the system
displays on the processor
card display indicate that the
software is loaded and
running?
READY Fast Flicker
The problem could be a
loose cable connection.
Check all extension cables
are properly connected.
If this does not solve the
problem, continue along this
path of the flowchart.
A
Perform a module loopback
test on the NIC.
B
Perform an NCL loopback
test on the adapter cable
attached to the faulty port.
Load the DECNIS software.
See the DEC Network
Integration Server Software
Installation card for the load-
host operating system.
Test
successful?
(READY state)
Perform NCL loopback tests on the extension cables.
If there is more than one cable, test all cables in sequence:
1. Test the cable nearest the adapter cable.
2. If that cable passes the test, test the next section of cable.
3. Repeat step 2 until all sections of the cable have been
tested, or the test fails. B
All
tests successful?
Problem Solving Flowchart – note the NIC LED state and follow the procedure indicated
4

Module Loopback Test
NIC
1. MovetheNIC
switch down. 2. Wait until the hot- swap LED lights
up (approx. 2 s).
3. Move the NIC
switch up.
4. Wait until the READY
LED stops flashing
(max. 2 min).
5. Observethetest
result on the
LED display. NOTE
If loading has been
disabled for this slot,
the READY LED will
not stop flashing. To
enable the slot, see
the manual DEC
Network Integration
Server Manage-
ment.
flash no
flash
1. Attach the 50-way loopback
connector to the port to be
tested.
2. Run the module loopback test:
3. If the test passes, LEDs show the RUN state.
Ifthetestfails,LEDsshowtheFAULTorATTENTIONstate.
(a)
(b) Loopback
connector
Unfasten
screws
LKG–5727–91I
A
5

NCL Loopback Test
NCL> STARTLOOP NODE server MODEM CONNECT LINE –
_NCL> line–name MODE CONNECTOR
NCL> LOOP NODE server MOP CIRCUIT circuit [COUNT –
_NCL> integer,] [LENGTH integer,] [DATA type]
When the prompt returns, enter the following command:
(a) (b)
server name
nameof physical line
circuit name
=
=
=
COUNT, LENGTH, and DATA specify the number of blocks, length, and type of data to be sent
inthetest. Thedefaultsends1blockof40byteswithanalternatingsequenceof1sand0s(hexa-
decimal value=55). For more details, see DEC Network Integration Server Problem Solving.
NCL Command Information
server
line–name
circuit
NCL>
Unfasten
screws
Loopback
connector
LKG–5728–91I
1. Start NCL
on the load
host.
2. Attachthe cable loopbackconnector
to the end of the synchronous or
adapter cable that you are testing.
Test the end furthest from the NIC.
3. Enter the following command:
4. If the test passes, no message is displayed.
If the test fails, an error message is displayed.
B
6

Check the Synchronous Cables
Whenno software isloaded, afaulty cable canbe detected onlyby
substituting with a new cable:
1. Replace a section of synchronous cable with a new cable.
2. Attempt to load the software.
3. If loading is successful, you have solved the problem (the re-
placed cable is faulty).
If loading is unsuccessful, the cable you tested was not faulty.
Reconnect the cable.
Repeat the procedure until you have isolated the faulty cable.
If you still cannot solve the problem, contact Digital Services.
C
7

Replacing Faulty Components
If replacingthefaulty componentdoes notsolve theproblem,
checkthe InstallationandServiceManualforyourDECNIS:donot
performanyproceduresinthemanualunlessyouareaserviceper-
son (see the Installation and Service Manual for your DECNIS).
NIC
Adapter cable
Extension cable
InstallanewNIC. RefertotheInstallationand
ServiceManual foryourDECNIS:DONOTdo
this unless you are a service person.
Refer to the panel for attaching cables in the
DEC WANcontroller 622 Cabling Information
and Specifications card.
Faulty Components Action
D
8