Re: WIS OH

[Pankaj Kumar <pkumar@xxxxxxxxxx>]

Osamu, dave
    In the WAN PHY, Beside the  line AIS 
( With K2 byte processing ) and path AIS ( Pointer bytes processing ),
Other SONET/SDH higher layer ( Section, Line ) alarms like Loss of signal
( LOS), Loss of Sonet/SDH frame etc should  Disable the 66/64 Decoder
and the Loss of Delineation defect should be detected , Then MAC will discard
frame.
        The same concept is used
in the ATM Framing   When there is higher order alarm
in the SONET/SDH Section, Line  etc), The  HEC State machine
Jump to HUNT
state . The same concept should hold good for 66/64 Decoder as well
for  Higher order
alarms( Line AIS, Path AIS, Loss of signal Loss of SONET/SDH Frame
etc ).

Pankaj
 

David Martin wrote:

 

Osamu,

Your description is correct. If you're asking how the WAN PHY will react to
Line/Path AIS, the pointer processor will detect AIS-P and the all ones
signal will be passed from the WIS up to the 66/64 decoder, which will lose
sync (e.g. LOD defect, Loss Of Delineation), then the MAC will see the
ReceiveDataValid line inactive & discard frames.

...Dave

-----Original Message-----
From:   Osamu ISHIDA [SMTP:ishida@xxxxxxxxxxxxxxxxxxx]
Sent:  Friday, June 09, 2000 6:24 AM
To:    Martin, David [SKY:1I63-M:EXCH]
Cc:    stds-802-3-hssg@xxxxxxxx
Subject:       Re: WIS OH

Hi Dave,

Could you help me to understand how WAN-PHY and ELTE would react on
SONET AIS (Alarm Indicaton Signal)?

When we have cable cut in SONET infrastructure, the SONET side of
the ELTE will receive either Line-AIS or Path-AIS.

  Line-AIS: all '1' in Line OH and SPE payload.
            generated by the regenerator who detect upstream cable cut.
            detected by the last 3 bits in K2 (at least 3 consecutive '111')

  Path-AIS: all '1' in AU pointer and SPE payload.
            generated by LTE who detect upstream cable cut.
            detected by the all '1' in H1&H2 at least 3 consecutive frames.

Thank you,
Osamu

At 5:13 PM -0400 00.6.1, David Martin wrote:
> Gary, Osamu,
>
> Regarding the need for B2/M1. My thinking behind proposing B1 & B3/G1
> only is that B1 is sufficient for fault isolation, and B3/G1 can serve
> adequately for performance monitoring in the typical BER operating
> range (a carrier can tap in with Intermediate Path Performance
> Monitoring - IPPM).
>
> Regarding the need for K1-2. I was thinking that protection switching
> in the LAN is not a traditional feature. In the WAN, optical layer
> protection could be used.
>
> Roy has suggested using J1 Path Trace. I can see value in that.
> But I believe if we add more OH beyond the WIS proposal (i.e. B1,
> B3/G1, J0), save J1, we'll be crossing the line from compatible
> to compliant & adding unnecessary cost.
>
> ...Dave

-----------------------------------------
Osamu ISHIDA
NTT Network Innovation Laboratories
TEL +81-468-59-3263  FAX +81-468-55-1282

-- 
Pankaj Kumar
Level One Communication Inc.
An Intel Company
201 Mission Street, 5th Floor
San Francisco CA-94105
Direct : (415) 536-2166
Fax    : (415) 536-2102
Email  : pkumar@xxxxxxxxxx