Frame Relay Terminology

Before continuing with the discussion of Frame Relay, you should take a moment to familiarize yourself with the terms listed in Table 9-1. You will see these terms throughout this chapter.

Table 9-1. Frame Relay Key Technical Terms
Acronym
Definition
Bc
Committed burst rate
Be
Excess burst rate
BECN
Backward explicit congestion notification
CIR
Committed information rate
DCE
Data communications equipment
DE
Discard eligible
DLCI
Data-link connection identifier
DTE
Data terminal equipment
FECN
Forward explicit congestion notification
Frame Relay Data Rate
Identifies the maximum, or peak, Frame Relay data rate. This is computed using the following formula: (Bc + Be) / Be * CIR.
LMI
Local Management Interface
MaxR
Maximum data rate
NNI
Network-to-Network Interface
PVC
Permanent virtual circuit
SVC
Switched virtual circuit
UNI
User-Network Interface
0-CIR service providers (SPs)
Some service providers offer a 0 CIR. Not exceeding CIR in this case means that traffic is not sent across the line. This is ideal for voice implementations, but Service Level Agreements (SLAs) must be negotiated with your SP to ensure that good quality is maintained across your circuit.

Table 9-1. Frame Relay Key Technical Terms
Acronym	Definition
Bc	Committed burst rate
Be	Excess burst rate
BECN	Backward explicit congestion notification
CIR	Committed information rate
DCE	Data communications equipment
DE	Discard eligible
DLCI	Data-link connection identifier
DTE	Data terminal equipment
FECN	Forward explicit congestion notification
Frame Relay Data Rate	Identifies the maximum, or peak, Frame Relay data rate. This is computed using the following formula: (Bc + Be) / Be * CIR.
LMI	Local Management Interface
MaxR	Maximum data rate
NNI	Network-to-Network Interface
PVC	Permanent virtual circuit
SVC	Switched virtual circuit
UNI	User-Network Interface
0-CIR service providers (SPs)	Some service providers offer a 0 CIR. Not exceeding CIR in this case means that traffic is not sent across the line. This is ideal for voice implementations, but Service Level Agreements (SLAs) must be negotiated with your SP to ensure that good quality is maintained across your circuit.

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