分類：Shipping Terms
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3PL vs 4PL
The difference between Third-Party Logistics and Fourth-Party Logistics providers.
Activity-Based Costing (ABC)
Methodology identifying activities in an organization and assigning their costs to products/services based on actual consumption.
Advanced Shipping Notice (ASN)
A document that provides detailed information about a pending delivery.
Agile Supply Chain
Supply chain architecture focusing on responsiveness, flexibility, and quickness to manage daily operations.
Air Cargo
Freight transported by aircraft, prioritized for speed and high-value, time-sensitive shipments.
Air Freight
The transportation of goods by aircraft, known for its speed and reliability.
Air Waybill (AWB)
A receipt issued by an international airline for goods and an evidence of the contract of carriage.
Arrival Notice
Notification sent by a carrier to a consignee informing them that a shipment has arrived at its destination.
Automated Guided Vehicle (AGV)
Portable robot that follows markers, wires, or uses navigation sensors to automate internal transport.
B2B Logistics
The logistics processes involved in transporting goods from one business to another.
B2C Logistics
Fulfillment and delivery processes transporting goods directly to a consumer.
Back Order
An order for a product that is temporarily out of stock and will be shipped when inventory becomes available.
Backhaul
The return trip of a commercial transport vehicle, often carrying freight back over all or part of the same route.
Barcode Tracking
The use of printed barcodes to identify and track items throughout the supply chain.
Batch Picking
An order picking strategy where a picker gathers items for multiple orders simultaneously.
Bill of Lading (B/L)
A legal document issued by a carrier to a shipper that details the type, quantity, and destination of the goods being carried.
Bill of Materials (BOM)
A comprehensive list of components, sub-assemblies, and materials required to produce a product.
Blind Drop Shipping
A fulfillment method where the supplier ships directly to the customer without revealing the supplier's identity.
Booking Fee
A charge applied for reserving or booking space with a carrier or freight service.
Break Bulk Cargo
Goods that must be loaded individually and not in intermodal containers or as bulk cargo.
Break Bulk
Cargo that is shipped as individual units or packages rather than in containers or bulk carriers.
Bulk Freight
Unpackaged cargo shipped in large quantities, typically commodities like grain, coal, or liquid chemicals.
Bulk Storage
Storage of large quantities of goods in dedicated warehouse areas, typically pallets in racking or floor-stacked.
Bullwhip Effect
A supply chain phenomenon where small changes in consumer demand cause increasingly large fluctuations further up the chain.
Bunker Adjustment Factor (BAF)
A fuel surcharge applied by ocean carriers to account for fluctuating bunker fuel costs.
Capacity Planning
The process of determining the production capacity needed to meet changing demands for products or services.
Carbon Footprint Reduction
Strategies and initiatives to minimize the greenhouse gas emissions generated by logistics operations.
Cargo Insurance Premium
The cost paid to an insurer for cargo insurance coverage on a shipment.
Cargo Insurance
Insurance coverage protecting the value of goods against loss or damage during transit.
Carnet
An international customs document that permits the tax-free and duty-free temporary export and import of goods.
Carrier Liability
The legal responsibility of a transportation carrier for loss or damage to goods in their care.
Carrier Network
The infrastructure of routes, facilities, and vehicles a transportation carrier uses to move goods.
Cash on Delivery (COD)
A payment arrangement where payment is collected from the recipient at the time of delivery.
Certificate of Conformity
A document certifying that a product meets specified standards or technical requirements.
Chain of Custody
A documented chronological record tracking the movement and handling of goods from origin to destination.
Chargeable Weight
The weight used by carriers to calculate freight charges, being the greater of actual or dimensional weight.
Chargeback
A financial penalty imposed by a retailer on a supplier for non-compliance with shipping, packaging, or documentation requirements.
Chassis Usage Fee
A daily rental charge for the wheeled frame used to transport intermodal containers by road.
Circular Economy
System aimed at eliminating waste through the continual reuse and recycling of resources.
Clearance Fee
A charge by a customs broker for processing and submitting import or export customs documentation.
Click and Collect
A retail service where customers order online and collect their purchase from a physical store or pickup point.
Cold Chain
A temperature-controlled supply chain used for perishable goods and pharmaceuticals.
Cold Storage Facility
A temperature-controlled warehouse designed to store perishable goods at specific temperature ranges.
Commercial Invoice
The primary document used in international trade, detailing the goods sold and the terms of the transaction.
Consignee
The recipient or destination party named on a Bill of Lading or shipping document who receives the goods.
Consignor
The party that ships goods and is named as the sender on a Bill of Lading or shipping document.
Container Freight Station (CFS)
A facility where freight shipments are consolidated or de-consolidated, and staged between transport legs.
Container Handling Charge
A fee charged by ports and terminals for loading, unloading, and moving containers.
Containerization
A system of intermodal freight transport using intermodal containers made of weathering steel.
Continuous Improvement
An ongoing process of identifying and implementing incremental improvements to operations and processes.
Continuous Replenishment
Ongoing inventory replacement process to minimize holding costs and maintain optimal stock levels.
Contract Logistics
Outsourcing of supply chain management functions to a third-party provider under a long-term agreement.
Cost to Serve
The total cost of supplying a product to a customer, including all logistics, handling, and service costs.
Countervailing Duty
An additional import tariff applied to offset subsidies provided by a foreign government to its exporters.
Country of Origin
The country in which a product was manufactured, produced, or substantially transformed.
Currency Adjustment Factor (CAF)
A surcharge applied by carriers to adjust freight rates for currency exchange rate fluctuations.
Customs Bond
Financial guarantee ensuring that all import duties and taxes are paid to the government.
Customs Clearance
The process of passing goods through customs so they can enter or leave a country legally.
Customs Duty Fees
All charges and fees associated with the customs clearance and duty payment process for imported goods.
Customs Tariff
A government-published schedule of duties applicable to imported and exported goods, organized by commodity classification.
Damage Claim
A formal request to a carrier or insurer for compensation for goods that were lost or damaged in transit.
Dangerous Goods Declaration
Certification that hazardous materials are packaged, labeled, and declared according to safety standards.
Dangerous Goods
Materials or items that pose a risk to health, safety, or property during transportation.
Dead Stock
Inventory that is unsellable due to damage, obsolescence, or lack of demand.
Deadhead
A truck or vehicle traveling empty or without a paying load, typically on a return trip.
Delivery Appointment Fee
A charge for scheduling a specific delivery time window at a residential or commercial location.
Delivery Cost Per Order
The average total cost incurred to deliver a single customer order to its destination.
Delivery Experience Management
The practice of managing and optimizing the post-purchase customer experience from shipment to delivery.
Delivery Lead Time
The time elapsed from when a shipment leaves the origin to when it arrives at the destination.
Demurrage Charges
Daily fees assessed by an ocean carrier when an import container is not returned within the agreed free time.
Demurrage
A charge incurred when a container is not returned to the carrier within the agreed free time at a port or terminal.
Detention Fees
Charges assessed by a carrier when equipment (containers or trailers) is held beyond the permitted free time.
Dimensional Weight
A pricing technique used by carriers that prices packages based on the space they occupy rather than their actual weight.
Direct-to-Consumer (DTC)
A business model where brands sell products directly to end consumers, bypassing traditional retail channels.
Dispatch
The process of assigning and scheduling carriers or vehicles to pick up and deliver shipments.
Distribution Center
A specialized warehouse that serves as a hub for receiving, storing, and distributing products to retail stores or customers.
Distribution Network
The connected series of storage facilities and transportation links that move products from manufacturers to customers.
Dock Receipt
Receipt issued by an ocean carrier acknowledging the arrival of a shipment at the facility.
Documentation Fee
A carrier or forwarder charge covering the preparation, processing, and filing of shipping documents.
Drayage
Short-distance transport of ocean freight containers, typically between a port and a nearby warehouse or rail ramp.
Drop Fee
A surcharge applied when a carrier leaves a trailer at a facility without a driver waiting.
Dropshipping Model
A retail fulfillment strategy where the seller forwards customer orders directly to a supplier who ships to the customer.
Dropshipping
A retail fulfillment method where the seller does not hold inventory but transfers orders directly to a supplier who ships to the customer.
Dunnage
Protective materials used to secure and protect cargo inside transport vessels.
Duty Drawback
A refund of customs duties paid on imported goods that are subsequently exported or used in export products.
E-Fulfillment
The process of fulfilling orders placed through e-commerce channels, from order receipt to delivery.
E-Commerce Fulfillment
The complete process of receiving, processing, and delivering orders placed through online sales channels.
E-Commerce Logistics
The logistics operations and infrastructure supporting online retail, from warehousing to last-mile delivery.
E-Commerce Returns
The process of managing merchandise returned by customers who purchased through online channels.
Electronic Proof of Delivery (ePOD)
Digital record confirming a delivery was successfully completed, often with signature or photo.
Emergency Fuel Surcharge
A temporary additional fuel charge applied by carriers during periods of sudden, sharp increases in fuel prices.
Enterprise Resource Planning (ERP)
Integrated software platform for managing core business processes in real-time.
Expedited Shipping
Faster-than-standard shipping services that prioritize delivery speed at a higher cost.
Export Clearance Fee
A charge for processing export customs documentation and obtaining necessary clearances for outbound shipments.
Export Declaration
A form submitted to customs authorities detailing the goods being exported.
First Mile Delivery
The first leg of a shipment's journey, typically from manufacturer or supplier to a distribution center or carrier.
Free on Board (FOB)
An incoterm specifying at what point respective obligations, costs, and risk involved in the delivery shift from seller to buyer.
Freight Audit
The process of verifying carrier invoices against contracted rates to identify billing errors and overcharges.
Freight Broker
An intermediary who connects shippers with carriers to arrange transportation of goods.
Freight Class
A standardized classification system used in LTL freight to determine shipping rates based on density, stowability, handling, and liability.
Freight Consolidation
The combination of multiple small shipments into a single larger load to achieve economies of scale in transport.
Freight Forwarder
An agent who arranges the transportation of goods on behalf of shippers, coordinating carriers, documentation, and customs.
Fuel Surcharge
A variable fee carriers add to freight rates to offset fluctuating fuel costs.
Fulfillment Center
A warehouse facility specifically designed to receive, process, and ship e-commerce orders to end customers.
Full Truckload (FTL)
A freight shipment that fills an entire truck trailer, contracted directly between shipper and carrier.
Green Logistics
Sustainable supply chain management focused on reducing the environmental footprint.
Gross Weight
The total weight of the goods, including their packaging and the vehicle or container transporting them.
Handling Fee
A charge for the physical management of goods, including loading, unloading, or special handling requirements.
Hazardous Materials Fee
A surcharge applied by carriers for transporting goods classified as dangerous or hazardous materials.
Hazardous Materials
Substances that pose a risk to health, safety, property, or the environment during transportation.
Hub and Spoke Model
A logistics network design where cargo flows through central hubs before being distributed to final destinations.
Import Compliance
Adherence to all laws, regulations, and requirements governing the importation of goods into a country.
Inbound Freight
Shipments incoming from vendors to a business location.
Inbound Logistics
The transport, storage, and delivery of goods coming into a business.
Incoterms
International Commercial Terms — standardized trade terms defining the responsibilities of buyers and sellers in international transactions.
Inspection Fee
A charge for physical examination of goods by customs authorities or third-party quality inspectors.
Insurance Surcharge
An additional charge added to freight rates to cover cargo insurance or carrier liability coverage.
Intermodal Container
Standardized container used for moving goods across different modes (ships, trains, trucks).
Intermodal Surcharge
Additional fees applied to intermodal shipments covering chassis use, rail drayage, or terminal handling.
Intermodal Transportation
Shipping goods using multiple modes of transport with a single container, managed under one bill of lading.
Inventory Accuracy
The degree to which recorded inventory quantities match actual physical inventory counts.
Inventory Management
The process of ordering, storing, tracking, and controlling inventory to ensure the right products are available in the right quantities.
Inventory Visibility
Real-time awareness of inventory quantities, locations, and statuses across all nodes in the supply chain.
Just-in-Time (JIT)
An inventory strategy where materials and products are ordered and delivered exactly when needed.
Kaizen in Warehousing
The application of continuous improvement philosophy to warehouse operations for incremental efficiency gains.
Logistics KPIs
Key Performance Indicators used to measure and evaluate the efficiency and effectiveness of logistics operations.
Last Mile Carrier
Transportation company specializing in the final delivery phase.
Last Mile
The final step of the delivery process from a distribution hub to the end customer.
Lead Time
The time between initiating a process and its completion, particularly from ordering to receiving goods.
Less Than Container Load (LCL)
Ocean freight shipments that do not fill an entire standard shipping container.
Lift Gate Service Fee
A carrier surcharge for using a hydraulic lift to raise or lower freight at locations without a loading dock.
Loading Dock
A platform at a warehouse or distribution center where trucks are loaded and unloaded.
Logistics
The planning, implementation, and control of the movement and storage of goods, services, and information.
Long Haul Surcharge
An additional fee applied to shipments traveling beyond standard service area distances.
LTL Freight
Less-than-Truckload shipping — transporting freight that doesn't require an entire trailer.
Material Handling
The movement, storage, control, and protection of materials and products throughout the supply chain.
Measurement Fee
A charge for re-measuring packages when dimensions are disputed or need re-verification.
Micro-Fulfillment
Small, automated or semi-automated fulfillment facilities located in urban areas close to the end customer.
Mobile Commerce
The buying and selling of goods through mobile devices, and its implications for logistics and fulfillment.
Modal Shift
The change of freight transport from one mode to another, often for cost, speed, or environmental reasons.
Multi-Channel Selling
Selling products across multiple channels simultaneously, including online, in-store, and marketplaces.
Multimodal Transportation
The movement of goods using two or more modes of transport under a single contract.
Omnichannel Logistics
A fulfillment approach that integrates multiple sales channels into a unified supply chain and inventory system.
On-Time Delivery (OTD)
A KPI measuring the percentage of shipments or orders delivered within the promised or expected timeframe.
Order Accuracy
A metric measuring the percentage of orders fulfilled correctly with the right items, quantities, and condition.
Order Cycle Time
The total time from when an order is placed by a customer to when it is delivered.
Order Fulfillment
The complete process of receiving, processing, and delivering an order to a customer.
Order Picking
The warehouse process of retrieving products from storage locations to fulfill customer orders.
Order Tracking Page
A web page where customers can enter their order or tracking number to see the current status of their shipment.
Origin/Destination Fee
Charges applied at the point of origin or destination covering specific handling or service requirements.
Outbound Freight
Shipments leaving a facility to move toward the customer or next point in the supply chain.
Outbound Logistics
The processes involved in moving finished goods from the manufacturer or distribution center to the end customer.
Over-Dimensional Cargo
Freight that exceeds standard size or weight limits for regular transport and requires special permits or equipment.
Packaging Design
The design of containers and protective materials that house products for transport, storage, and sale.
Packaging
The materials, design, and processes used to contain, protect, and present products for storage, transport, and sale.
Packing List
A document accompanying a shipment that itemizes the contents of each package.
Packing Slip
A document included in a shipment that lists all items included in the package.
Pallet Jack
A tool used to lift and move palletized loads within a warehouse or distribution facility.
Pallet Racking
A material handling storage aid system designed to store materials on pallets in horizontal rows with multiple levels.
Palletization
The process of stacking and securing goods on pallets for efficient storage, handling, and transportation.
Parcel Delivery Speed
The time between shipment and delivery of a parcel, and how carriers and shippers optimize for faster fulfillment.
Parcel Sorting
The automated or manual process of categorizing and routing packages by destination in carrier facilities.
Payment Gateway
An e-commerce technology that processes customer payments and their impact on order management and fulfillment.
Per Diem Fee
A daily rental charge for equipment (typically chassis or containers) used beyond agreed free time.
Perfect Order Rate
A supply chain metric measuring the percentage of orders that are delivered on time, complete, damage-free, and correctly invoiced.
Performance Auditing
Systematic review and analysis of logistics operations against standards, benchmarks, or contractual requirements.
Personalization in Logistics
Tailoring the delivery experience to individual customer preferences, from packaging to timing and communication.
Pick and Pack
The warehouse process of selecting ordered items from storage and packaging them for shipment.
Pick Density
A metric expressing the number of picks per unit distance traveled in a warehouse.
Pickup Fee
A carrier charge for collecting a shipment from the shipper's location.
Port Congestion Surcharge
A temporary fee added by ocean carriers to compensate for delays and costs caused by port congestion.
Port of Entry
A designated location where goods and travelers cross a national border under customs authority.
Port of Loading
The seaport from which a shipment departs on an ocean vessel.
Pre-Shipment Inspection
A quality verification check conducted on goods before they leave the origin country.
Pro Forma Invoice
A preliminary bill sent before goods are shipped, used for customs, financing, or buyer approval purposes.
Procurement Logistics
The management of activities involved in sourcing, purchasing, and inbound delivery of materials and goods.
Product Information Management (PIM)
Systems for centralizing and managing product data across all sales channels and supply chain partners.
Proof of Delivery Fee
A charge for obtaining and providing documented confirmation that a shipment was delivered.
Proof of Delivery (POD)
Documentation confirming that a shipment has been delivered to the intended recipient.
Putaway
The process of moving received goods from the receiving dock to their designated storage locations in a warehouse.
Re-Delivery Fee
A charge assessed when a carrier must attempt delivery more than once due to recipient unavailability.
Re-Weigh Fee
A charge applied when a shipment must be weighed again to verify or correct the declared weight.
Reefer Container
A refrigerated intermodal container used to transport temperature-sensitive goods by sea, rail, or road.
Reorder Point
The inventory level at which a new order is triggered to replenish stock before it runs out.
Residential Delivery Fee
A surcharge applied by carriers when delivering to a home address rather than a commercial business location.
Return Merchandise Authorization (RMA)
A process and authorization number used to manage product returns from customers to sellers or manufacturers.
Returns Management System
Software that automates and optimizes the handling of product returns throughout the reverse supply chain.
Reverse Logistics
The process of moving goods from their final destination back through the supply chain for return, repair, or recycling.
RMA (Return Merchandise Authorization)
An approval process that authorizes customers to return a product for exchange, repair, or refund.
Root Cause Analysis
A structured problem-solving method to identify the fundamental cause of logistics failures or defects.
RoRo Shipping
Roll-on/Roll-off shipping where wheeled cargo drives on and off vessels under their own power or with ramps.
Routing and Scheduling
The optimization of delivery routes and timetables to minimize cost and time while meeting delivery commitments.
Sanitary and Phytosanitary Measures
Regulations governing food safety standards and plant and animal health requirements for international trade.
Supply Chain Management (SCM)
The coordination of all activities involved in sourcing, procuring, producing, and delivering products to customers.
Security Surcharge
A fee charged by carriers to offset the cost of security measures, screening, and compliance requirements.
Shipment Consolidation
Combining multiple smaller shipments into a single larger shipment to reduce transportation costs.
Shipment Insurance
Coverage purchased to protect the financial value of goods against loss or damage during transport.
Shipment Tracking
Monitoring the location and status of a shipment from origin to destination using carrier data systems.
Shipping Carrier API
Application programming interfaces that allow software systems to connect directly to carrier services for rating, booking, and tracking.
Shipping Cost Optimization
Strategies and tools used to reduce the total cost of freight and parcel delivery without compromising service.
Shipping Courier
A company or individual that transports commercial packages and documents.
Shipping Manifest
A document listing all shipments included in a carrier pickup or vehicle load.
Six Sigma in Logistics
The application of Six Sigma quality management methodology to reduce defects and variability in logistics processes.
SKU
Stock Keeping Unit — a unique identifier assigned to each distinct product in inventory.
Smart Port
A port that uses digital technologies, IoT, automation, and data analytics to optimize cargo handling and operations.
Social Commerce
The buying and selling of products directly through social media platforms, and the fulfillment implications.
Sorting Hub
A facility in a carrier's network where parcels are sorted by destination and route for onward distribution.
Standard Operating Procedures (SOPs)
Documented step-by-step instructions that standardize recurring processes in logistics and warehouse operations.
Storage Fee
A charge for holding goods in a carrier facility, port, or warehouse beyond the allowed free storage period.
Subscription Logistics
Supply chain and fulfillment strategies tailored to the regular, scheduled delivery of subscription products.
Supplier Relationship Management
The systematic approach to evaluating, developing, and managing supplier performance and partnerships.
Supply Chain Risk Management
Identifying, assessing, and mitigating risks that could disrupt supply chain operations.
Supply Chain Visibility
The ability to track parts, components, and products as they move through the supply chain in real time.
Supply Chain
The network of entities, activities, and resources involved in creating and delivering a product.
Tare Weight
The weight of an empty container, vehicle, or packaging material, subtracted from gross weight to determine net cargo weight.
Technical Barriers to Trade
Non-tariff measures such as product standards, testing requirements, or certification rules that restrict imports.
Terminal Handling Charge (THC)
A fee charged by shipping lines or port operators for moving containers within a port terminal.
TEU
Twenty-foot Equivalent Unit — the standard unit for measuring container ship and port capacity.
Third-Party Logistics (3PL)
An organization's use of third-party businesses to outsource elements of its distribution, warehousing, and fulfillment services.
Total Quality Management (TQM)
A management approach focused on long-term success through customer satisfaction and continuous improvement of all processes.
Track and Trace
The capability to track the current location and movement history of a shipment.
Tracking API
An application programming interface that provides programmatic access to carrier shipment tracking data.
Tracking Fee
A charge for access to shipment tracking services or enhanced visibility tools provided by carriers.
Tracking Number
A unique identifier assigned to a shipment that allows it to be monitored throughout transit.
Trade Barrier
Government-imposed restrictions that limit the free exchange of goods and services between countries.
Trade Embargo
A government order prohibiting or severely restricting trade with a particular country or group of countries.
Transit Time
The time taken for a shipment to travel from its origin to its destination, not including processing time.
Transportation Fee
The base charge for moving goods from one location to another by a carrier.
Transportation Management
The planning, execution, and optimization of physical movements of goods across all transportation modes.
Transshipment
The transfer of cargo from one vessel or vehicle to another at an intermediate port or hub during transit.
Two-Day Delivery
A shipping service that guarantees delivery within two business days of shipment.
Unboxing Experience
The customer experience of opening and unpacking a delivered product, including packaging design and presentation.
Unit Load Device (ULD)
A pallet or container used to load cargo onto aircraft, standardizing the loading process for air freight.
Unloading Fee
A charge for the labor and equipment required to offload freight from a vehicle at the delivery destination.
Value Added Services - Customs
Additional customs-related services beyond standard clearance, such as ruling requests, binding classification, or audit support.
Value-Added Tax (VAT)
A consumption tax placed on a product whenever value is added at each stage of the supply chain.
Virtual Inventory
Inventory that is listed for sale across multiple channels but physically located at supplier or manufacturer facilities.
Virtual Storefront
An online sales channel that presents products to customers without maintaining physical retail space.
Warehouse Efficiency
The measure of how effectively a warehouse uses its resources — space, labor, equipment — to process orders.
Warehouse Inbound Fee
A charge by a 3PL or warehouse operator for receiving, unloading, and processing inbound inventory.
Warehouse Outbound Fee
A charge by a 3PL or warehouse operator for picking, packing, and preparing outbound shipments.
Warehouse Utilization
The percentage of available storage space in a warehouse that is actively being used to store inventory.
Waste Management in Logistics
Processes and strategies to reduce, reuse, and recycle materials generated by logistics and warehousing operations.
Waybill Fee
A charge for the preparation and processing of a waybill document accompanying a shipment.
Waybill
A non-negotiable transport document that serves as a contract of carriage between shipper and carrier.
Web Store Integration
Connecting an e-commerce platform to warehouse, shipping, and inventory systems for automated order fulfillment.
Weight Surcharge
An additional charge applied when a shipment exceeds standard weight thresholds for a service.
White Glove Delivery
A premium delivery service that includes installation, assembly, or placement of large or high-value items inside the customer's home.
White Glove Service Fee
A premium charge for enhanced delivery services including room placement, assembly, and installation.
Warehouse Management System (WMS)
Software and processes that allow organizations to control and administer warehouse operations from the time goods or materials enter a warehouse until they move out.
Workplace Safety
Policies, procedures, and practices designed to protect workers from accidents and health hazards in logistics environments.
Yield Management Premium
A pricing adjustment applied by carriers to maximize revenue during periods of high demand or capacity constraints.
Yield Management
A pricing strategy used by carriers and logistics providers to maximize revenue by adjusting rates based on demand.
Zero Defect Policy
A quality management principle that sets a standard of zero tolerance for defects in products or processes.
Zero Stock Logistics
An inventory management approach that aims to minimize or eliminate on-hand inventory by synchronizing supply with demand.
Zone Skipping for E-Commerce
An e-commerce shipping strategy where orders are transported in bulk to distribution points closer to customers before final delivery.
Zone Skipping
A shipping strategy where packages are transported closer to their final destination in bulk before being injected into the local carrier network.