I have been pretty happy with the MRV box. It is passive and it not manageable like an ONS etc. It has been rock solid for some time. www.mrv.com Specifically, we are using the CWDM EM316PAMULC. The only bad thing I would say is there is often a several week delay on delivery of ordered parts. But when they do arrive they work well. hth, jim -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Greg Schwimer Sent: Tuesday, July 27, 2004 11:39 AM To: nanog@nanog.org Subject: CWDM or DWDM passive add/drop muxes Does anyone have any experience with GBIC-based CWDM and/or DWDM optical add/drop muxes (OADM)? I'm presently looking at the Cisco product lines which combines GBICs with passive multiplexors and am curious as to alternative manufacturers and the experiences other might have in these types of products in a metro application. TIA, Greg