What Is Nokia AirScale ASIB? 473764A.102 Explained

What is Nokia AirScale ASIB?

Nokia AirScale ASIB (AirScale Common Module, P/N 473764A.102) is the control and transport unit inside the Nokia AirScale AMIA 3U BBU subrack. It occupies the dedicated C1 slot of the AMIA chassis and serves as the system management, synchronization, and backhaul hub for the entire AirScale baseband system.

Unlike capacity boards (ABIO/ABIA) that handle raw baseband signal processing, the ASIB focuses on common system functions: it manages OAM (Operations, Administration & Maintenance), provides precise clock synchronization across all boards, handles internal data switching, and delivers uplink connectivity to the core network. Without a functioning ASIB, the AMIA subrack and its paired capacity boards cannot boot or operate.

This module supports multi-RAT (2G/3G/4G/5G) deployments and is widely used in telecom operator networks, system integration projects, and spare part stocking programs worldwide. Its part number structure is straightforward: 473764A is the base product series code, while .102 indicates the S23 hardware revision — the most common and widely deployed version in global field service.

Core Functions of Nokia AirScale ASIB

• ✓System Management & OAM: Handles overall system configuration, real-time hardware status monitoring, fault detection, alarm reporting, and communication between the BBU and Nokia NetAct network management platform.
• ✓Clock Synchronization: Provides the unified timing reference for all ABIO/ABIA capacity boards in the AMIA chassis, ensuring stable data transmission between BBU and remote AirScale RRH/RRU radio units.
• ✓Control & Transport Unit: As the control and transport hub, the ASIB manages system control and provides backhaul connectivity. It is equipped with 3× RJ45 (1G Ethernet) for management, 2× SFP+ (1/10 GE) for high-speed backhaul, 2× QSFP+ (SEI1/SEI2) for AirScale system module chaining, and 1× SFP+ (SRIO) for internal interconnect and management.
  
• ✓Multi-RAT Coordination: Supports 2G, 3G, 4G LTE, and 5G NR operation, working in coordination with capacity boards to build a complete multi-standard baseband system.

ASIB and ABIO: How They Work Together

The AMIA chassis uses a clear division of labor between its two main board types:

• ✓ASIB (C1 slot): The control and transport hub — manages the system, synchronizes timing, and handles backhaul/chaining. Think of it as the “nervous system” of the BBU.
• ✓ABIO/ABIA (B1-B6 slots): The baseband processing engines — handle intensive signal processing, radio resource scheduling, and user-plane data. Think of them as the “muscle” of the BBU.

Together, one ASIB plus up to six ABIO/ABIA boards form a complete AirScale baseband system that connects to remote RRU/RRH units via CPRI/eCPRI fronthaul.

About 473764A.103 (Updated Revision)

There is also a later hardware revision, 473764A.103, within the same ASIB product family. It is physically interchangeable with the .102 version in the AMIA C1 slot. For detailed technical specifications, firmware compatibility requirements, and availability, please contact us directly.

Application Scenarios of AirScale ASIB

• ✓Telecom network maintenance and faulty board replacement for existing AirScale base stations
• ✓New site rollout and capacity expansion for 4G and 5G mobile networks
• ✓Network upgrade projects that migrate legacy single-RAN sites to multi-RAN SRAN architecture
• ✓Spare part inventory stocking for system integrators, telecom hardware traders and regional operators

Skyward Telecom Supply of Nokia AirScale ASIB

Skyward Telecom supplies genuine Nokia AirScale spare parts including ASIB 473764A.102, AMIA chassis, ABIO/ABIA baseband boards, and the full range of AirScale RRU/RRH radio units. Every unit is fully tested before shipment. We serve telecom operators, system integrators, and telecom hardware traders worldwide. New original, used original, and refurbished units are available.