Network Industry
Network Reliability and Availability: From Private Control to NBN Backbone to Remote Cellular
TMG models network availability across three distinct domains: private control networks (rail signalling, mining and utility SCADA, industrial control), public broadband backbones (the NBN within Australia and the subsea fiber extending to New Zealand), and cellular networks supporting remote mining and rail operations. The methodology weaves Fault Tree Analysis and Reliability Block Diagrams from the Isograph Reliability Workbench with Network Availability Prediction (NAP), applied across virtual servers, edge routers, firewall appliances, and the Huawei-class dynamic optical transport equipment that reallocates fiber capacity in response to loading.
Built for the standards your carrier-grade and industrial network has to satisfy
The methodology and documentation we deliver is configured against the working set of telecom-reliability, optical, industrial-control, and cellular standards that govern network availability and the regulatory frame that operators work to.
Private control, public broadband, and cellular for remote operations
Each domain carries its own topology, its own failure modes, its own availability targets, and its own regulatory frame. The modelling toolkit is the same across all three: RBD for topology, FTA for failure-combination logic, NAP for end-to-end availability.
Private Control Networks
The networks that carry rail signalling, mining and utility SCADA, industrial control, substation communications, and the broader operational-technology layer. Topology mixes virtual servers, edge routers, firewall appliances, and intelligent optical switches (Huawei-class dynamic transport equipment that reallocates fiber capacity in response to loading). Availability targets are commercially severe; recovery-time obligations are measured in seconds, not hours; and the safety case that runs on top of the network treats availability as a precondition for the safety claim itself.
Public Broadband (NBN and Regional Fiber)
The NBN backbone within Australia and the subsea and regional fiber networks that extend connectivity to New Zealand and the broader Asia-Pacific. The reliability question is national in scale: end-to-end path availability across the trunk, the access network, the protection-switching architecture, and the international crossings. Carrier-grade equipment libraries (Telcordia and Bellcore lineages) provide the component-level rates; the topology drives the system-level number that customer and regulator both contract to.
Cellular for Remote Mining and Rail
Remote mining sites and long-haul rail corridors increasingly run operations on cellular (4G LTE, LTE-M, 5G NR) for telemetry, autonomous haul-truck dispatch, remote train control, and safety supervision. The reliability case is different from rural fixed-line: cell-site availability, backhaul redundancy, core-network reachability, and the network recovery capability under base-station failure define the operating envelope. The availability number that operations management contracts to is the number NAP produces, not the headline carrier-grade marketing figure.
Virtual servers, edge routers, firewalls, dynamic optical, and cellular RAN and core
The element-level reliability picture is the foundation of every system-level availability number. TMG models each element class with the combination of methods appropriate to its failure profile, drawing on the Telcordia / Bellcore lineage where component-level rates are required.
Virtual Servers and Edge Compute
Virtualised compute and storage at the edge of the network: hypervisor stack, container orchestration, edge-compute appliances, and the failure modes that propagate from a single hardware element through the virtualisation layer into the services running on it. The reliability picture has to account for hypervisor-level failure recovery, live-migration capability, and the cross-rack redundancy the operator has actually deployed.
Edge Routers and Firewall Appliances
Carrier-grade edge routers and firewall appliances at the boundary between operator domains. Failure modes include hardware faults, configuration drift, software-bug failure cascades, and the protection-switching logic that is supposed to mask them. RBD captures the redundancy topology; FTA captures the failure combinations that defeat it.
Dynamic Optical Switching (Huawei-Class)
Modern Huawei-class optical transport appliances dynamically reallocate fiber capacity in response to traffic loading and link condition. The reliability model has to capture the switching logic itself: the failure modes that can leave the network in a sub-optimal allocation, the recovery time when an automated reallocation has to be reversed, and the state-dependent transitions that distinguish the dynamic equipment from a fixed-path predecessor.
Cellular Radio Access and Core
For cellular networks supporting remote operations, the elements are the radio access network (cells, base stations, antennas, backhaul links) and the mobile core (control plane, user plane, evolved packet core, 5G service-based architecture). End-to-end availability for a remote-controlled asset depends on every element in the path being available simultaneously, which is exactly the system-level number NAP exists to compute.
RBD, FTA, and NAP: three Isograph methods, one reliability model
TMG's network engagement is anchored in the Isograph reliability and availability portfolio. Two of the three primary methods sit within the Isograph Reliability Workbench: Reliability Block Diagrams capture the network topology and redundancy logic, and Fault Tree Analysis composes the individual failure modes into the combinations that produce a defined top event. The third method, Network Availability Prediction, integrates the topology, the failure logic, and the network-element model into a single end-to-end availability computation. The three methods share component data and integrate within the broader Availability Workbench environment, so a single reliability model carries the topology analysis, the failure-combination analysis, and the end-to-end availability case against shared component data and failure-rate libraries.
Reliability Block Diagrams from the Reliability Workbench
RBD from the Isograph Reliability Workbench captures the redundancy topology of the network: components in series, components in parallel, m-out-of-n redundancy logic, common-cause failure groups, and the protection-switching configurations that real carrier-grade equipment implements. The result is the topology-level availability number, before the dynamics of the operating environment are folded in.
Fault Tree Analysis from the Reliability Workbench
FTA from the Reliability Workbench composes the individual failure modes into the combinations that produce a defined top event: a path outage, a service-level breach, a safety-case violation. The fault tree quantifies the probability of each combination and ranks the minimum cut sets so the engineering team knows which single-point and multi-point failures actually drive the risk.
Network Availability Prediction at network scale
NAP integrates the topology from RBD, the failure-combination logic from FTA, and the network-specific element model (virtual servers, edge routers, firewalls, optical transport, cellular radio access, mobile core) into a single end-to-end availability computation. The output is the system-level availability number that operations management actually contracts to, against the failure-rate data the carrier-grade libraries provide.
Cellular network availability for autonomous and remote-controlled assets
For autonomous mining haul, remote rail control, and the broader class of operations running over cellular networks, TMG applies NAP with the cellular-specific topology (cell sectors, backhaul redundancy, core-network reachability) and the failure-mode data the radio-access equipment library provides. The availability number that emerges is grounded in the actual operating environment rather than the headline carrier-marketing figure.
Backbone availability across the NBN and the subsea extension to New Zealand
For carrier-grade backbone work, TMG applies NAP to the optical transport network, including the dynamic Huawei-class switching layer, the protection-switching topology, the cross-domain handoffs between Australian NBN infrastructure and the subsea fiber extending to New Zealand and the broader regional network. The same reliability model carries both the trunk-level numbers and the end-to-end service-availability case.
What the network availability modelling delivers
The descriptors below characterise the typical outputs of a TMG network reliability engagement. Depth in any given engagement scales with the size of the network, the diversity of the element mix, and the rigour of the availability case the operator is building against.
Engage TMG for your network reliability programme
The Mantua Group delivers network availability prediction and reliability modelling for carriers, network operators, and industrial operators of private control networks, public broadband backbones, and cellular networks supporting remote operations. We bring the analytical rigour, the standards familiarity, and the implementation discipline that turns a network topology diagram into a defensible availability case.