RailCorp, the company charged with operating passenger rail services in New South Wales, has indicated its intention to move away from Asynchronous Transfer Mode (ATM) and adopt a new IP network connecting more than 350 locations.
In a document issued yesterday, RailCorp states it "... is building an IP based Operations Critical Data Network (OCDN) to replace its existing ATM data network."
The OCDN is owned and maintained by RailCorp's Communications and Control Systems Division (C&CS) . Other parts of RailCorp, such as stations, signalling units, depots and general offices are considered to be customers of C&CS.
The organisation has issued a document calling for potential suppliers to pre-register for consideration as members of a supplier panel, and specifies two types of switch as suitable for the new network:
- "The higher grade CA switch, called the Operations Critical Customer Access Switch is defined as a Customer switch which supports services that, should they fail, would affect train running. The availability target for operations critical services across the OCDN is greater than 99.9995%."
- "A less stringent grade of switch, called the Non-Operations Critical Customer Access Switch is defined as a Customer switch carrying services which, should they fail, would not affect train running. The availability target for non-operations critical services across the OCDN is between 99.9% and 99.995% depending on the configuration."
Topography of RailCorp's planned network. Source: Document No. WS15292 (image not available at higher resolution).