Beatrice Lang
CIR is a commonly used abbreviation in the field of electricity and networking. In electrical circuitry, CIR stands for Close Indication Relay. In networking, CIR is an acronym for Committed Information Rate, which is a way of assuring individual users a minimum bandwidth speed, even when they share the same physical connection.
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What You'll Learn
- CIR is an acronym for Close Indication Relay in electrical circuitry
- CIR stands for Committed Information Rate
- CIR SLA determines how much guaranteed bandwidth each customer gets
- CIR-conformant frames are determined by the committed (C) bucket
- CIR offers a way of assuring individual users a minimum bandwidth speed
CIR is an acronym for Close Indication Relay in electrical circuitry
In this context, CIR refers to the committed information rate. This determines which customer receives a guaranteed amount of bandwidth, regardless of how many other customers are sharing the bandwidth pool. Since total bandwidth is limited, customers must pay a premium price for the CIR. The total CIR of all the PVCs (permanent virtual circuits) through an interface can exceed the physical speed of the interface but not the access speed.
The CIR SLA (service-level agreement) dictates how much guaranteed bandwidth each customer receives. When average traffic rates are below the CIR, unused bandwidth capacity accumulates up to a maximum amount, known as the committed burst size (CBS). This is the maximum traffic burst size the network commits to deliver during a specified time interval, even if it temporarily increases the bandwidth beyond the allowed limit.
The CIR is calculated over a small sliding window interval and can be implemented on a per-interface or per-PVC basis. It is set to a minimum value of 8 kilobits per second and can be increased in blocks of 4 kbps.
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CIR stands for Committed Information Rate
The CIR is determined by a service-level agreement (SLA) and is based on the customer's needs. For example, a customer sending streaming video over a content delivery network requires more bandwidth than a customer sending only data. The total CIR of all the permanent virtual circuits (PVCs) through an interface can be greater than the physical speed of the interface, but it cannot exceed the access speed. PVCs provide enhanced connectivity, addressing, flexibility, and cost-effectiveness compared to private leased circuits.
The CIR is calculated over a small sliding window interval and can be set to a minimum value of 8 kilobits per second, with the ability to increase in blocks of 4 kbps. When average traffic rates are below the CIR, unused bandwidth capacity can accumulate up to a specified maximum amount, known as the committed burst size (CBS). This allows for a temporary increase in bandwidth beyond the allowed limit during a specified time interval.
Bandwidth profile policing for CIR is managed through a two-rate, three-color marker model. This model utilises two buckets: the committed (C) bucket and the excess (E) bucket. The C bucket determines CIR-conformant frames, while the E bucket determines excess information rate (EIR)-conformant, excess service frames. Tokens are continuously added to the buckets at the respective rates of CIR/8 bytes for the C bucket and EIR/8 bytes for the E bucket until the buckets are full.
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CIR SLA determines how much guaranteed bandwidth each customer gets
Committed Information Rate (CIR) is a service-level agreement (SLA) parameter used in telecommunications networks to ensure a certain level of service quality for data traffic. The CIR SLA determines the minimum guaranteed bandwidth that a network service provider must deliver to a customer at all times, regardless of network congestion or other factors that may affect the quality of service.
In a typical telecommunications network, different types of traffic compete for the available bandwidth. For example, voice, video, and data traffic have diverse bandwidth requirements and quality of service (QoS) needs. The CIR guarantees a minimum level of bandwidth, but it does not ensure freedom from network congestion. During periods of high network traffic, performance may still be impacted, even with the CIR being met.
The CIR is determined based on network capacity and the customer's bandwidth requirements. It is expressed in bits per second and represents the minimum data rate maintained between nodes in a permanent virtual circuit (PVC). Different logical connections within a Frame Relay network may share the same physical path, and CIRs ensure that individual users receive a minimum bandwidth speed, even when sharing the same physical connection.
The CIR SLA ensures that each customer receives a certain minimum guaranteed bandwidth for accessing cloud resources. For instance, a cloud storage provider may set a CIR of 100 Mbps for each customer, ensuring a minimum speed for uploading and downloading data from the cloud. Customers requiring more bandwidth, such as those streaming video over a content delivery network, will need a higher CIR than those only sending data.
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CIR-conformant frames are determined by the committed (C) bucket
Committed information rate (CIR) is the guaranteed rate at which a Frame Relay network will transfer information under normal line conditions. In Frame Relay networks, CIR refers to the bandwidth associated with a logical connection in a permanent virtual circuit (PVC). The CIR is expressed in bits per second and represents the minimum data rate to be maintained between nodes in a PVC—in other words, the bandwidth a user is guaranteed at all times.
The CIR is calculated over a small sliding window interval and can be implemented on a per-interface or per-PVC basis. It is based on a service-level agreement (SLA) that determines how much guaranteed bandwidth each customer receives, regardless of how many customers share the bandwidth pool. For example, a customer sending streaming video over a content delivery network requires more bandwidth than a customer sending only data.
The CIR is closely related to the token bucket algorithm, which is used to control the rate of traffic in a network. The token bucket can be used for traffic policing or traffic shaping to protect the network against excess or bursty traffic. In the context of the token bucket algorithm, the CIR refers to the token replenishment rate, which limits the long-term average rate of bytes entering the network.
The committed (C) bucket, as mentioned in the prompt, is a crucial component of the token bucket algorithm. This bucket is continuously replenished by adding tokens at the CIR/8 bytes rate. When the C bucket is full, no further tokens are added. The C bucket determines CIR-conformant frames, while the excess (E) bucket determines EIR-conformant (excess service) frames.
To illustrate the concept, let's consider an example. Assume that the desired traffic rate is CIR of 2.4 Mbps. The token bucket definition dictates that the token generator credits the token bucket with 3000 bytes worth of tokens every 10 milliseconds. This ensures that the conforming traffic will not exceed 2.4 Mbps. In this case, if a 900-byte packet arrives, it conforms to the C bucket and is transmitted. As a result, 900 bytes are removed from the C bucket, leaving 1100 bytes. However, if a larger packet of 1800 bytes arrives next, it does not conform to the C bucket and is checked against the excess token bucket (E bucket).
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CIR offers a way of assuring individual users a minimum bandwidth speed
CIR is an acronym that stands for "Close Indication Relay" in electrical circuitry. It is also known as "Committed Information Rate" in the context of networking and telecommunications.
Committed Information Rate (CIR) is a concept in Frame Relay networking that offers a way to guarantee minimum bandwidth speed for individual users, even when they share the same physical connection. Frame Relay is a packet-switching telecommunication service that allows data transmission between geographically separated local area networks or across wide area networks.
In a Frame Relay network, different logical connections share the same physical path, and some connections are allocated higher bandwidths than others. CIR ensures that each user receives a minimum guaranteed bandwidth, regardless of how many other customers are sharing the bandwidth pool. This guarantee is specified in a service-level agreement (SLA) between the network provider and the customer.
The CIR SLA determines the amount of bandwidth allocated to each customer, which is typically measured in megabits per second (Mbps). Customers requiring higher bandwidth, such as those streaming video content, will pay a premium price for their CIR. The total CIR across all connections through an interface can exceed the physical speed of the interface but remains within the access speed.
When average traffic rates are below the CIR, unused bandwidth accumulates up to a specified maximum amount, known as the committed burst size (CBS). This accumulated bandwidth can be used during periods of higher demand, ensuring that the network delivers the promised performance during specified time intervals.
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Frequently asked questions
CIR stands for Close Indication Relay in electrical circuitry.
CIR stands for Committed Information Rate.
CIR SLA stands for Committed Information Rate Service-Level Agreement. It determines which customer gets how much guaranteed bandwidth, regardless of how many other customers share the bandwidth pool.
The committed (C) bucket determines CIR-conformant frames. The excess (E) bucket determines EIR-conformant, excess service frames.
CIR stands for Circuit and CKT stands for Circuit Kit.
