GarrettCom manual Power Budget Calculations for 6KQE Modules with Fiber Media

Magnum 6KQE Managed Edge Switch Installation and User Guide 02/09

4.4Power Budget Calculations for 6KQE Modules with Fiber Media

Receiver Sensitivity and Transmitter Power are the parameters necessary to compute the power budget. To calculate the power budget of different fiber media installations using Magnum products, the following equations should be used:

OPB (Optical Power Budget) = PT(min) - PR(min)

where PT = Transmitter Output Power, and PR = Receiver Sensitivity

Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss) Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]

where the “Cable Loss” for 62.5/125 and 50/125μm (M.m) is 2.8 dB/km, and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km,

and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km

and the “Cable Loss” for 9/125 (Single-mode) is 0.4 dB/km (LX25) and the “Cable Loss” for 9/125 (Single-mode) is 0.25 dB/km (ZX40) and the “Cable Loss” for 9/125 (Single-mode) is 0.2 dB/km (ZX70)

See http://www.garrettcom.com/techsupport/power_budget.pdf for more information on Power budget calculations

5.0Magnum 6KQE Managed Edge Switch Port Modules

This chapter describes each Port Module (PM), including appearance, functionality, and status displays.

5.16KQE Modules

An important feature of the Magnum 6KQE is the use of Port Modules for

flexible mixed-media connectivity to RJ-45 copper and various fiber media. The first four ports (1,2,3 & 4) of the Magnum 6KQE Switches are fixed RJ-45 copper ports with dual-speed 10/100Mbps auto-negotiating capability. Additionally the switch can accept up to two Port Modules to provide the user with up to 6 additional ports (10 total) providing a wide selection of Ethernet copper and fiber media connections with 10, 100 and 1000Mbps capability and up to 70km.

Note: The 6KQE Port modules are not identical to the port modules used in other 6K products such as the 6K25e and 6K16V. For information about other 6K products, please see the applicable manual. For a list of 6KQE Port Modules, refer to Section 1.2

Each 6KQE Port Module (PM) is individually described in the following sections.

www . GarrettCom . com

28