3Com 6416SW manual Nni, Sdh

at

a time

until

the

Telnet

session

gives

a

normal

response

time. The last port that

you

disabled

should

be

the

one

through

which the congesting calls were coming.

2. If

you

can

be

in

front

on

the

ONcore

hub/CELLplex

4000,

log on to the console,

make

sure that the trace is not active,

then if

the

ATM

switch

is

an ONcore,

look

the

traffic

LEDs

and

disable the

for which

the

traffic LED

is

constantly

lit.

If

ATM

switch

is

a

CELLplex 4000,

disable the

high-bandwidth

port.

When there is congestion, it is often due

to

the

failure

of a major ATM component

(AR

server,

LAN emulation server, switch down, public

network

down,

file

server

down).

You

have

to

determine

which

of

these

ATM

components

failed.

Problems of ATM connections/performance through a WAN (VP tunnel).

Steps to Take:

1. Check the Switch configurations at both sides:

check that the VPI corresponds to the VPI provided by your network provider.

check that the bandwidth is lower or equal to the Maximum Peak Rate negotiated with your network provider.

The

actual

bandwidth used

by

your

media

modules

is the maximum one (155 Mbps

for

a

6402M

module,

100

Mbps

for

a

6404M-100

module

etc.), even

if a

lower

value

is specified with the SET_LOGICAL_LINK command.

check

that

one

NNI

port

on

one

side

is

defined as 'network-side'

and

that the

NNI

port

on

the other side is defined

as

'user-side'.

if

you

are

using single mode 6402M modules, you

probably have to define the

clocking as external, using the SET PORT command

(the clock is

usually

provided

by

the WAN). In addition, if

you have a CELLplex 4000 or an ONcore

hub

with

a

microcode

version

greater

than 2.0,

you have to specify the type o

network

(SONET

or

SDH)

at

the

end

of

the

SET

PORT

command.

2.If the previous steps did not help, then you require an ATM Analyzer for the following tests:

Hardware wrap		test	through the WAN up				to the media	module, install	the ATM
Analyzer	at one	side	of	the	WAN,	and the ONcore hub/CELLplex 4000 at			the
other.	Disable	your	NNI	port,	and	enter	the command	WRAP slot.port
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