Coarse Wave Division Multiplexing, CWDM, fibre cabling, optical fibre

CWDM

CWDM (Coarse Wave Division Multiplexing) is a cost effective way to increase bandwidth capacity without installing additional fibre cabling or leasing additional dark fibre from a Telco. Multiple channels of variable rate services of up to 10Gb each can be multiplexed on a single optical fibre by using different wavelengths (colours) of laser light to carry different signals over distances of up to 80km.

Typical applications:

1.	Internet Service Providers who have operations in more than one Telehouse
2.	Large Businesses who want to link to their Main Data Centre to a disaster recovery site. This requires high bandwidth Ethernet and live backup to an Offsite Storage Area Network (SAN). Typically a Storage Area Network uses Fibre Channel - an alternative to Ethernet which can be fed through the CWDM alongside the Ethernet
3.	High Speed Internal backbone or inter cabinet links where only 2 core fibre has been installed or is available

Active Products Pros and Cons:

+	Solution can be Managed. Standard GBIC’s can be used
–	Uses twice as many GBIC’s as a passive solution (requires GBICs for every channel of the CWDM and end equipment)

Passive Products Pros and Cons:

+	Does not require power so high MTBF and can be positioned almost anywhere
–	Requires more expensive ‘coloured’ GBIC’s in end equipment

Part Number	Description	Price	PDF	Spec	Add
Allied Telesyn - AT-WG1003	Allied Telesyn 3 Slot 19" Rack Mountable Chassis for WaveGlider Series	£64.00
Allied Telesyn - AT-WG101-13	Allied Telesyn Diplexer, 1310nm TX and 1550nm RX (must be used with WG101-15)	£176.00
Allied Telesyn - AT-WG101-15	Allied Telesyn Diplexer, 1550nm TX and 1310nm RX (must be used with WG101-13)	£176.00
Allied Telesyn - AT-WG102-13	Allied Telesyn Diplexer, 1310nm TX and 1310nm RX (must be used in pairs)	£176.00
Allied Telesyn - AT-WG102-15	Allied Telesyn Diplexer, 1550nm TX and 1550nm RX (must be used in pairs)	£176.00
Allied Telesyn - AT-WG103-13	Allied Telesyn Diplexer, 1310nm TX and 1310nm RX (must be used in pairs)	£245.60
Allied Telesyn - AT-WG4310WIBANDW1	Allied Telesyn CWDM Wide Band 1 Multiplexer (Bands 1 & 2), Industrial Temperature	£960.00
Allied Telesyn - AT-WG4310WIBANDW2	Allied Telesyn CWDM Wide Band 2 Multiplexer (Bands 3 & 4), Industrial Temperature	£960.00

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