Difference between revisions of "Hall Network Specifications"

Revision as of 11:51, 14 October 2013

Below we propose a design for fiber connections between the Rack Room and the Hall, and network switch and terminal server placement.

Elliott Wolin, Mark Dalton

11-Oct-2013

Notes

• Based on 10**8 photons/sec, 200 kHz trigger rate, existing L1 rejection algorithm, block=1 mode, no compression.
• Ethernet port counts from Fernando's rack layouts and information from Dave Butler concerning other controls requirements.
• We own about 15 24-port managed switches with 10 GBit/s fiber uplinks, some being used in EEL building and other places.
• 8-port managed switches with 1 GBit/s fiber uplinks exist.
• Only managed switches (no hubs!) allowed in hall.
• Fibers come in bundles of 12 or 24, 2 fibers needed for one uplink.
• Standard JLab practice is to terminate all fibers in patch panel when bundles installed.
• Bundle/patch panel installation is expensive, can run much cheaper patch fibers from switch in one rack area to patch panel in nearby rack area.
• DAQ crates require two Ethernet connections each, one for the ROC and one for the fan tray.
• ROC's each need an RS232 connection to a terminal server, terminal servers require an Ethernet connection.
• Each terminal server has xxx ports.