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ALM
ALM

Active Line Monitoring Series

The Adtran Active Line Monitoring (ALM) Series is an advanced fiber monitoring solution that provides continuous, real-time surveillance of optical fiber networks, enabling operators to proactively manage the health, performance, and security of their fiber infrastructure. Designed for both access and core networks, ALM delivers fast and accurate fault detection while allowing network services to remain fully operational.

Using integrated Optical Time Domain Reflectometry (OTDR) technology, the ALM Series continuously detects abnormal attenuation, fiber breaks, and potential fiber tapping attempts. When an event occurs, the system instantly generates alarms and pinpoints the exact geographic fault location through seamless integration with Adtran Mosaic Fiber Director, the embedded GUI, or third-party GIS platforms. This provides operators with complete network visibility, enabling faster troubleshooting, reduced service downtime and improved operational efficiency.

The ALM Series is available in 16ALM, 64ALM, and 48ALM-T variants to accommodate different network sizes and deployment requirements. With optional extension units, a single monitoring system can supervise up to 800 optical fibers making it an ideal solution for large-scale telecom, railway, utility, enterprise, FTTH and smart city fiber networks.

For Passive Optical Networks (PON), the 48ALM-T supports Deep PON Assurance (DPA), providing visibility down to individual ONTs without requiring passive reflectors. It supports multi-vendor PON environments and long-distance monitoring of up to 160 km (unidirectional) and 320 km (bidirectional), making it suitable for metro, access, and long-haul FTTH deployments.

Operating non-intrusively at 1650 nm, the ALM Series continuously monitors both live and dark fibers without affecting network traffic. Its precise fault localization, centralized monitoring capabilities, and low-maintenance design help network operators improve reliability, reduce maintenance costs and ensure maximum network availability.

Applications of Active Line Monitoring (ALM) Series:

The Active Line Monitoring (ALM) Series is designed for continuous monitoring and protection of optical fiber infrastructure across a wide range of network environments. It supports both point-to-point and Passive Optical Network (PON) architectures while providing end-to-end visibility of fiber assets.

  • Telecom Networks: Monitor backbone, metro, and access fiber networks with real-time fault detection, proactive maintenance, and rapid fault localization to ensure maximum service availability.
  • Railway Communication Networks: Provide continuous monitoring of mission-critical railway communication and signaling fiber networks, enabling quick identification of cable faults and minimizing operational disruptions.
  • Utility Networks: Secure fiber infrastructure used by power transmission, distribution, and utility communication networks with 24×7 monitoring and centralized alarm management.
  • FTTH & PON Networks: Monitor Passive Optical Networks from the OLT to individual ONTs with Deep PON Assurance, supporting all PON generations without requiring passive reflectors.
  • Mobile Fronthaul & Backhaul: Maintain reliable fiber connectivity for 4G/5G fronthaul and backhaul networks through continuous performance monitoring and fast fault isolation.
  • DWDM Optical Networks: Continuously monitor high-capacity DWDM fiber links to detect degradation, attenuation, and faults before they affect network performance.
  • Dark Fiber Monitoring: Supervise unused dark fibers to ensure network readiness, prevent unauthorized access, and maintain fiber integrity for future deployments.
  • Point-to-Point Fiber Networks: Enable proactive monitoring of dedicated fiber links with long-term performance measurement, fault detection, and support for ring and linear network topologies.
  • Enterprise & Data Center Networks: Protect mission-critical enterprise and data center fiber infrastructure by reducing downtime, improving fault response times, and enhancing network reliability.
  • Smart City & Government Networks: Support large-scale fiber deployments for smart cities and government communication networks with centralized monitoring, GIS-based visualization, and precise fault localization.
  • Fiber Build-Out & Commissioning: Verify fiber quality during network deployment and construction with support for fiber build-out certification and long-term passive plant performance monitoring.
  • Remote Environmental Monitoring: Integrate passive water sensors, cabinet door sensors, and maintenance hole sensors to monitor environmental conditions and physical security across unmanned fiber sites.

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Active Line Monitoring Series
Features Specifications FAQ Downloads



Features
  • 24×7 Real-Time Fiber Monitoring: Monitors fiber health round-the-clock and instantly detects cuts, attenuation, degradation, and intrusions.
  • 1650 nm Non-Intrusive Monitoring: Operates completely outside transmission bands, ensuring zero interference with active telecom and signalling traffic (Safe for Live Railway Networks)
  • GIS-Based Fault Localization: with MFD integration, pinpoint faults are displayed with exact geographic coordinates for faster field response.
  • Monitor Both Dark & Live Fibers: Supports monitoring of unused dark fibers as well as live operational fiber links without service disruption.
  • Built for Harsh Outdoor Environments: 48ALM-T variant supports extended temperature range (-40°C to +65°C) with redundant DC power architecture
  • Faster Fault Isolation & Reduced MTTR: Accurate fault detection and localization significantly reduce downtime and maintenance response time
  • Integrated Passive Sensor Monitoring: Supports cabinet intrusion, water ingress, and maintenance hole monitoring using passive environmental sensors.
  • Centralized Network Visibility: MNC/FMS platform aggregates alarms, reports, and monitoring data from all deployed ALMs
Specifications

General Information

Parameter

Units

16ALM

64ALM

48ALM-T

96-Port Extension

384-Port Extension

Height

RU

1

Width

HP

42

84

84

84

42

Depth (Without Brackets)

mm

212

212

212

207

207

Depth (With Brackets)

mm

221(ETSI)

221(ETSI)

235(ETSI)

207(ETSI)

207(ETSI)

Depth (With Fan Filter)

mm

N/A

273

N/A

Power Consumption

W

10

13

20 W typical at 40°C; 50 W during warm-up; 25 W at 65°C

N/A (USB powered by ALM Unit)

Power Supply Options

VDC/VAC

DC (-72 to -36 VDC); AC (90–264 VAC)

N/A (USB powered by ALM Unit)

MTBF at 30°C Ambient Temperature

Years

>20

Operating Temperature

°C

-5 to +55

-40 to +65

-5 to +65

Storage Temperature

°C

-40 to +85

 

OTDR Specifications

Parameter

Units

16ALM

64ALM

48ALM-T

Number of Ports

Ports

16

64

48

Laser Safety

 

Class I

RF Tone Frequencies

Hz

270, 330, 1k, 2k

Dynamic Range(*) (**) OTDR Core

dB

41

41

42

Wavelength

nm

1650

Pulse Width

ns

5 to 20,000

Number of Data Points

points

up to 256,000

Distance Range

km

Up to 160 (unidirectional), Up to 320 (bidirectional)

Sampling Resolution

m

0.1 to 1.6

Event Dead Zone

m

0.8

Attenuation Dead Zone

m

4

Distance Accuracy

m

± (0.8 + sampling resolution + 9.5 x 10-6 x distance)

Optical Switch Lifetime

Cycles

1 x 109

Extension Unit Insertion Loss

dB

1.5 (Typical)

(*) Specifications at 25°C. (**) Depending on pulse width and resolution

 

Equipment Management

Management Method

Supported protocols

Embedded GUI

HTTPS

Northbound Interfaces

SNMP v1, v2c, v3, NETCONF, REST API

Command Line

SSH

Remote Authentication

RADIUS, TACACS+

Geographic Data

Embedded KML/KMZ support Adtran Mosaic Fiber Director Third-party GIS systems

Standards Compliance

ETSI EN 300019-1-3, Protection Class I 20P, CE, FCC, NRTL, VCCI
FAQ

What is the Active Line Monitoring (ALM) Series?

The Active Line Monitoring (ALM) Series is an intelligent fiber monitoring solution that continuously monitors optical fiber networks, detects faults in real time, and helps operators proactively manage the health, performance, and security of their fiber infrastructure.

How does the ALM Series detect fiber faults?

The ALM Series uses integrated Optical Time Domain Reflectometry (OTDR) to continuously monitor fiber links. It detects abnormal attenuation, fiber breaks, and potential tapping attempts, then generates real-time alarms with the fault location.

Can the ALM Series monitor live fiber networks?

Yes. The ALM Series operates non-intrusively at 1650 nm, allowing continuous monitoring of live (in-service) and dark fibers without affecting network traffic or service performance.

What types of fiber networks are supported?

The ALM Series supports point-to-point networks, Passive Optical Networks (PON), backbone, metro, access, FTTH, railway, utility, enterprise, and DWDM fiber networks.

How does GIS integration improve fault management?

The ALM Series integrates with Adtran Mosaic Fiber Director, the embedded GUI, and third-party GIS platforms to convert OTDR fault data into geographic locations. This helps field teams locate and repair faults more quickly.

What ALM models are available?

The solution is available in three variants:
• 16ALM – 16 monitoring ports
• 64ALM – 64 monitoring ports
• 48ALM-T – 48 monitoring ports with an extended operating temperature range of -40°C to +65°C for harsh environments.

How many fiber links can one ALM system monitor?

With optional 96-port and 384-port extension units, a single ALM monitoring system can supervise up to 800 optical fibers, making it suitable for large-scale network deployments.

What is Deep PON Assurance (DPA)?

Deep PON Assurance is a feature of the 48ALM-T that provides visibility down to individual ONTs without passive reflectors. It supports multi-vendor PON networks and simplifies fault detection in complex FTTH deployments.

What is the maximum monitoring distance supported?

The ALM Series supports monitoring distances of up to 160 km in a single direction and 320 km in bidirectional deployments, depending on the application.

Can the ALM Series monitor environmental and security events?

Yes. The ALM Series supports passive water sensors, cabinet door sensors, and maintenance hole sensors to monitor water ingress, unauthorized cabinet access, and maintenance hole openings from a centralized location.

Does the ALM Series support third-party network management systems?

Yes. The solution supports integration with third-party GIS platforms and standard management protocols including SNMP, REST API, NETCONF, SSH, HTTPS, and KML/KMZ formats for seamless network management.

Which industries benefit from the ALM Series?

The ALM Series is suitable for telecom service providers, railway operators, electric utilities, government agencies, smart cities, data centers, enterprises, and any organization operating mission-critical optical fiber infrastructure.

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