NEC Elite 192 KSU (0x0)(Model # 750010)
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the Key Service Unit (KSU) for the Electra Elite 192 System provides 64 ports and can be expanded to a maximum of 192 ports with the addition of two expansion KSUs. This KSU is also used for the expansion KSUs. The P64-U10 PSU (power supply unit), backup batteries, and three PFT relays are included with each KSU.
Model # 750110 NEC Electra Elite IPK Port Key Upgrade$759.97