RE: [RPRWG] RPR and WDM topology discovery

["Vish Nandlall" <vnandlal@xxxxxxxxxxxxxxxxxx>]

Title: RPR and WDM topology discovery

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