Expansion Fiber Interface (EFI) Module – Refurbished NTBK55AC | Nortel/Avaya Fiber Expansion Card
CONDITION: RE-MADE IN THE USA™ Refurbished
Part Number: NTBK55AC
$149.00
Availability: In stock
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Product Description
Expansion Fiber Interface (EFI) Module – Refurbished NTBK55AC is a fiber expansion card designed for use in Nortel/Avaya Meridian and Option PBX systems, providing controlled, high-speed communication between cabinets, shelves, and expansion components. This module enables fiber-based interconnection, improving system scalability and maintaining stable data flow across distributed PBX infrastructure.
The NTBK55AC EFI module is essential for environments where multiple peripheral shelves or remote cabinets must be linked to a core switch environment. It delivers reliable fiber transport with minimal latency, ensuring the smooth operation of digital voice paths, data signaling, and system control.
Every NTBK55AC unit is professionally refurbished, cleaned, and tested, making it an ideal replacement or expansion part for maintaining legacy Nortel/Avaya deployments.
✅ Features
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Expansion Fiber Interface (EFI) Module – Refurb NTBK55AC
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Provides fiber expansion connectivity for Nortel/Avaya PBX systems
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Enables communication between core shelves and remote modules
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Supports high-speed signaling and stable voice/data transport
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Critical for multi-cabinet or distributed PBX architectures
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Fully tested and refurbished to OEM performance standards
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Ideal for maintaining legacy Meridian/Option equipment
✅ Q & A
Q: What does the NTBK55AC EFI module do?
A: It provides fiber-based connectivity between cabinets or shelves in Nortel/Avaya systems, enabling expansion and high-speed transport.
Q: Which systems is it compatible with?
A: Designed for legacy Nortel/Avaya Meridian and Option PBX systems.
Q: When would I need this module?
A: When adding remote shelves, fiber modules, or expanding system architecture beyond a single cabinet.
Q: Is this module new or refurbished?
A: This listing is for a refurbished NTBK55AC module, fully tested and verified.
Q: Can it be installed as a drop-in replacement?
A: Yes — installs directly into the designated fiber interface slot within the system.