NEC B64-U30 KSU Electra Elite IPK II PBX Phone System w/ 5 Cards 173593 173304

NEC B64-U30 KSU Electra Elite IPK II PBX Phone System w/ 5 Cards 173593 173304

The NEC B64-U30 is the Key Service Unit (KSU) for the Electra Elite IPK and IPK II telephone systems, manufactured by NEC Infrontia Corporation. The KSU is the central switching chassis of the phone system — it houses the processor, power supply, and expansion cards that connect to desk phones, trunk lines, and voicemail. This unit comes populated with five expansion cards and accepts wide-range AC input (100–240V), making it compatible with both North American and international power.

Specifications & What's Included

• Manufacturer: NEC Infrontia Corporation
• Model: B64-U30 KSU
• System: Electra Elite IPK / Electra Elite IPK II
• Input Power: AC 100V / 120V / 220–240V, 50/60Hz, x3 max
• Input Current: 1.8A / 1.5A / 0.8A–0.75A
• FCC/IC: IC 140K-7942A; FCC Part 15 Class B
• Rear panel: 3× DB9 connectors, 3× large edge-card expansion slots
• Included Card 1: NSA-173593-001 / M-785685 (CPU B64-U4 ETU card)
• Included Card 2: NSA-173304 / M-783641
• Included Card 3: NSA-173304 / M-783641 (second unit)
• Included Card 4: NSA-173295 / M-783610
• Included Card 5: FMS(4)-U10 ETU
• Backup batteries installed (visible in chassis interior)
• Note: Side cover is missing

Applications

The NEC Electra Elite IPK II is a digital key telephone system designed for small to mid-size business environments, typically supporting dozens of digital desk phones, analog extensions, and trunk lines within a single office or multi-department setting. The B64-U30 KSU is the core cabinet of the IPK II platform — it provides the processor, system bus, and card cage for the line interface, station, and voicemail expansion cards that define the system's capacity. The Electra Elite IPK and IPK II series were widely deployed throughout the 2000s in offices, hotels, medical offices, and retail environments, and the platform remains in active use at many installed sites that continue to maintain and expand their existing NEC systems. Replacement KSUs, cards, and expansion units are regularly sought by NEC-certified telephony technicians and businesses maintaining or rebuilding an existing IPK II installation.