RE: [RPRWG] RPR and WDM topology discovery

[Lewis Eatherton <leathert@xxxxxxxxxxxxxx>]

Also related is working that is going on in T1.X1 regarding link
concatenation, in other words taking a 40gb physical interface and
spreading the frames over 4x10gb lambdas.  It would probably be good
for the group to ask the folks from T1X1 to present what is being worked
on to date?

At 04:37 PM 8/7/2001 -0400, Vish Nandlall wrote:

see below
 

Vish Nandlall

 
Nortel Networks

ESN 393-1350
External (613) 763-1350
vnandlal@xxxxxxxxxxxxxxxxxx

-----Original Message-----

From: B J Lee [mailto:bjlee@xxxxxxxxxxxxxxxxxx]

Sent: Tuesday, August 07, 2001 3:57 PM

To: Nandlall, Vish [CAR:KCQ0:EXCH]; stds-802-17

Subject: RE: [RPRWG] RPR and WDM topology discovery

I do not think we identifed such a requirement so far, if I understand your question correctly.

Do you mean that a RPR node supports multiple rings on different wavelengths including

bypasses, acting as an interconnection attachment?

[Nandlall, Vish [CAR:SB06:EXCH]]

 

I didn't necessarily mean multiple rings supported on one RPR node (although it could be), I was thinking multiple RPR rings running on the same physical plant. One RPR node would terminate and source a wavelength dedicated to its ring, and optically bypass all other wavelengths. In this scenario, it would be difficult to sectionalize a fault if the nearest physical adjacent node was on a different wavelength.

 

 

It would be appreciated if you could clarify more on 

 "will RPR only connect as a client to an existing DWDM network and rely on whatever

  existing transport mechanism is in place?"

[Nandlall, Vish [CAR:SB06:EXCH]]

 I was referring to a configuration whereby the RPR node subtended an OADM box to access a wavelength in a DWDM ring (which in turn would provide connectivity to other RPR nodes hanging off upstream/downstream OADMs on the same wavelength). Multiple RPR rings could then be realized using the same physical ring structure. This would obviously require the development of a new client interface on the OADM to interface the RPR.

 

 

 

BJ

-----Original Message-----

From: owner-stds-802-17@xxxxxxxxxxxxxxxxxx [mailto:owner-stds-802-17@xxxxxxxxxxxxxxxxxx]On Behalf Of Vish Nandlall

Sent: Tuesday, August 07, 2001 1:06 PM

To: 'stds-802-17@xxxxxxxx'

Subject: [RPRWG] RPR and WDM topology discovery

In the context of an DWDM RPR implementing optical bypass, would there be a requirement for a dedicated supervisory channel for topology discovery (i.e. if both neighbors of an RPR node add/drop a different wavelength then there is no in-band mechanism for detecting physical adjacencies) - or will RPR only connect as a client to an existing DWDM network and rely on whatever existing transport mechanism is in place ?

Regards,

Vish Nandlall

Nortel Networks

ESN 393-1350

External (613) 763-1350

vnandlal@xxxxxxxxxxxxxxxxxx

Lewis Eatherton
Architect, Strategic Engineering
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Network: Any thing reticulated, or decussated, at equal distances, with interstices  between the intersections  -- Samuel Johnson, "A Dictionary of the English Language", London 1755