draft-ietf-bmwg-fr-term-03.txt   draft-ietf-bmwg-fr-term-04.txt 
Network Working Group J. H. Dunn Network Working Group J. H. Dunn
INTERNET-DRAFT C. E. Martin INTERNET-DRAFT C. E. Martin
Expires: September, 2000 ANC, Inc. Expires: February, 2001 ANC, Inc.
March, 2000 July, 2000
Terminology for Frame Relay Benchmarking Terminology for Frame Relay Benchmarking
<draft-ietf-bmwg-fr-term-03.txt> <draft-ietf-bmwg-fr-term-04.txt>
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with all This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026. Internet-Drafts are working provisions of Section 10 of RFC2026. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its areas, and documents of the Internet Engineering Task Force (IETF), its areas, and
its working groups. Note that other groups may also distribute working its working groups. Note that other groups may also distribute working
documents as Internet-Drafts. documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
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Measurement units: Intrinsic units used to quantify this metric. This Measurement units: Intrinsic units used to quantify this metric. This
includes subsidiary units, e.g. microseconds are acceptable if the includes subsidiary units, e.g. microseconds are acceptable if the
intrinsic unit is seconds. intrinsic unit is seconds.
2.2. Definitions 2.2. Definitions
2.2.1. Physical Layer- Plesiochronous Data Hierarchy (PDH) 2.2.1. Physical Layer- Plesiochronous Data Hierarchy (PDH)
2.2.1.1. Alarm Indication Signal (AIS) 2.2.1.1. Alarm Indication Signal (AIS)
Definition: An all 1s frame transmitted after the DTE or DCE detects a Definition: An all 1's frame transmitted after the DTE or DCE detects a
defect for 2.5 s +/- 0.5 s. defect for 2.5 s +/- 0.5 s.
Discussion: An AIS will cause loss of information in the PDH frame which Discussion: An AIS will cause loss of information in the PDH frame which
contains a frame relay frame which may contain IP datagrams. contains a frame relay frame which may contain IP datagrams.
Measurement units: Seconds. Measurement units: Seconds.
2.2.1.2. Loss of Frame (LOF) 2.2.1.2. Loss of Frame (LOF)
Definition: An NE transmits an LOF when an OOF condition persists. Definition: An NE transmits an LOF when an OOF condition persists.
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FR. Specifically, frame discards will negatively impact TCP throughput. FR. Specifically, frame discards will negatively impact TCP throughput.
2.2.2.8. Frame Transfer Delay (FTD) 2.2.2.8. Frame Transfer Delay (FTD)
Definition: The time required to transport frame relay data from measurement Definition: The time required to transport frame relay data from measurement
point 1 to measurement point 2. The frame transfer delay is the difference in point 1 to measurement point 2. The frame transfer delay is the difference in
seconds between the time a frame exits measurement point 1 and the time the same seconds between the time a frame exits measurement point 1 and the time the same
frame enters measurement point 2, in one direction of a single virtual frame enters measurement point 2, in one direction of a single virtual
connection. The formal definition of frame transfer delay is as follows: connection. The formal definition of frame transfer delay is as follows:
FTD = 1/N * sum {i=1 to N} t2_i t1_i, FTD = 1/N * sum {i=1 to N} t2_i - t1_i,
where where
t1 is the time in seconds when a frame left measurement point 1 (i.e., frame t1 is the time in seconds when a frame left measurement point 1 (i.e., frame
exit event), exit event),
t2 is the time in seconds when a frame arrived at measurement point 2 (i.e., t2 is the time in seconds when a frame arrived at measurement point 2 (i.e.,
frame entry event). FTD is computed for a specific DLCI and a specified frame entry event). FTD is computed for a specific DLCI and a specified
integration period of N seconds integration period of N seconds
Discussion: While frame transfer delay is usually computed as an average Discussion: While frame transfer delay is usually computed as an average
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Measurement units: seconds. Measurement units: seconds.
2.2.2.9. Frame Transfer Delay Variation (FTDV) 2.2.2.9. Frame Transfer Delay Variation (FTDV)
Definition: The variation in the time required to transport frame relay data Definition: The variation in the time required to transport frame relay data
from measurement point 1 to measurement point 2. The frame transfer delay from measurement point 1 to measurement point 2. The frame transfer delay
variation is the difference in seconds between maximum frame transfer delay and variation is the difference in seconds between maximum frame transfer delay and
the minimum frame transfer delay, in one direction of a single virtual the minimum frame transfer delay, in one direction of a single virtual
connection. The formal definition of frame transfer delay is as follows connection. The formal definition of frame transfer delay is as follows
FTDV = max {i=1 to N} FTD_i min {i=1 to N} FTD_i. FTDV = max {i=1 to N} FTD_i - min {i=1 to N} FTD_i.
where where
FTD is defined as above. FTD is defined as above.
Discussion: Large values of FTDV can adversely effect TCP round trip time Discussion: Large values of FTDV can adversely effect TCP round trip time
calculation and, thus, TCP throughput. calculation and, thus, TCP throughput.
Measurement units: seconds. Measurement units: seconds.
3. Security Considerations. 3. Security Considerations.
 End of changes. 

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