SIST ETS 300 337 E1:2003
(Main)Transmission and Multiplexing (TM); Generic frame structures for the transport of various signals (including Asynchronous Transfer Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) elements) at the ITU-T Recommendation G.702 hierarchical rates of 2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s
- Abstract
Specifies the way B-ISDN ATM cells are mapped into the various bit rates of the G.702 hierarchy for transport over the PDH network.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST ETS 300 337 E1:2003 is the Slovene version of ETS 300 337 Edition 1, a European telecommunications standard from ETSI. It specifies generic frame structures for transporting various signals, including Asynchronous Transfer Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) elements, at the ITU-T Recommendation G.702 hierarchical rates of 2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s. In practice, it is the reference for mapping those payloads onto Plesiochronous Digital Hierarchy (PDH) paths and for handling the associated frame overhead and payload structure.
What does SIST ETS 300 337 E1:2003 specify?
SIST ETS 300 337 E1:2003 specifies the frame structures and payload mappings used to carry ATM cells and selected SDH payloads over the three G.702 bit rates. It also gives the related path overhead functions needed for alignment, error monitoring, trail tracing and maintenance.
The document is organized as follows:
- Clause 1 - Scope
- Clause 2 - Normative references
- Clause 3 - Definitions and abbreviations
- Clause 4 - Frame structure at 2 048 kbit/s
- Clause 5 - Frame structure at 34 368 kbit/s
- Clause 6 - Frame structure at 139 264 kbit/s
- Clause 7 - Conformance testing
| Annex | What it covers |
|---|---|
| Annex A | Informative functions specific to support of ATM cells, including rate adaptation, HEC generation, cell delineation, and header verification |
| Annex B | Bibliography |
Clause 1 to 6 cover the interface structure itself. Annex A is helpful when implementing ATM handling in equipment, but it is given for information rather than as part of the interface specification.
What are the key requirements of SIST ETS 300 337 E1:2003?
SIST ETS 300 337 E1:2003 defines how each bit rate is framed, what overhead bytes are used, and how ATM or SDH payloads are arranged in the payload area. The practical effect is that a transmitter and receiver must agree on the same frame format, payload type and maintenance bits before traffic can pass correctly.
At 2 048 kbit/s
Clause 4 uses the basic frame structure from ETS 300 167, with generic path overhead and a 1 984 kbit/s payload capacity. For ATM support, valid or idle cells occupy the payload area and can cross the 125 μs frame boundary. TS 16 is reserved for future use, and the ATM cell payload is scrambled with a self-synchronizing scrambler to reduce false cell delineation and avoid repeating the frame alignment word.
In practice, this means a 2 Mbit/s implementation must preserve cell octet alignment, tolerate cells that span frame boundaries, and implement the required scrambling in both directions.
At 34 368 kbit/s
Clause 5 defines a 34 368 kbit/s frame with 7 octets of generic path overhead and 530 octets of payload per 125 μs. The path overhead includes frame alignment, BIP-8 error monitoring, trail trace, maintenance and adaptation functions, plus network operator and general communications bytes.
This matters because each byte has a maintenance role:
- FA1/FA2 provide frame alignment, using the same pattern as ETS 300 147
- EM carries BIP-8 over the previous frame
- TR carries a trail access point identifier based on E.164 numbering and CRC-7 protection
- MA carries RDI, REI, payload type, payload-dependent bits and a timing marker
- NR and GC are reserved for operator maintenance and communications use
Clause 5 also supports two payload types. One is ATM cells, which fill the whole payload area with the same scrambling rule as at 2 048 kbit/s. The other is 14 SDH TU-12s, arranged with fixed stuff columns and fixed phase relative to the frame. The payload-dependent bits in MA are used for TU multiframe indication, so equipment must interpret them correctly when TU-12 mapping is selected.
At 139 264 kbit/s
Clause 6 defines a 139 264 kbit/s frame with 16 octets of generic path overhead and 2 160 octets of payload per 125 μs. The first 9 overhead octets are defined, while the remaining 7 are left undefined in this document. The same overhead functions appear here, and P1/P2 are added for automatic protection switching.
Clause 6 supports three payload uses:
- ATM cells occupying the full payload, with the same boundary-crossing and scrambling rules
- 20 x TUG-2
- 2 x TUG-3 and 5 x TUG-2
For SDH element support, the payload is column-interleaved into fixed structures with fixed stuff columns, and the MA payload-dependent bits again carry the TU multiframe indication. In practice, implementers need to select the correct payload arrangement and keep the interleaving and phase relationship consistent across the network element.
ATM-specific functions and conformance
Annex A gives the ATM handling functions used with this frame mapping. It covers cell rate adaptation by inserting idle cells when needed, HEC generation, cell delineation based on HEC, and header verification and extraction at the receiver.
Clause 7 says conformance testing focuses on the functional blocks inside a network element and uses physical interfaces to exercise them. That tells test labs and equipment designers that compliance is checked at the implemented interface functions, not only by examining the document on paper.
What terms does SIST ETS 300 337 E1:2003 define?
SIST ETS 300 337 E1:2003 defines the key terms used to describe cell handling, error checks and SDH payload structures.
- idle cell - a cell inserted and removed by the adaptation function to match the ATM cell flow to the available PDH payload capacity.
- valid cell - a cell whose header has been declared free of errors by the HEC process.
- Header Error Control (HEC) - the ATM header error control mechanism used for header verification and cell delineation.
- Bit Interleaved Parity - 8 (BIP-8) - the path error monitoring method used for the EM byte.
- Remote Defect Indication (RDI) and Remote Error Indication (REI) - maintenance indications carried in the MA byte, with REI reflecting errors detected by BIP-8.
- Trail Trace Identifier (TTI) - the repeated identifier sent in the trail trace byte so the receiving end can verify the intended connection.
- Tributary Unit (TU) and Tributary Unit Group of level n (TUG-n) - SDH payload structures used in the TU-12, TUG-2 and TUG-3 mappings.
Who uses SIST ETS 300 337 E1:2003?
SIST ETS 300 337 E1:2003 is used by transmission and multiplexing engineers, SDH and PDH equipment designers, ATM implementers, network operators, test laboratories, and quality or procurement teams checking interface compatibility. They use it when defining frame layouts, mapping ATM cells or SDH payloads, setting overhead bytes, and verifying conformance of a network element’s physical interface functions.
Which standards are used with SIST ETS 300 337 E1:2003?
SIST ETS 300 337 E1:2003 depends on several referenced standards and related publications to define the wider transmission context.
- CCITT Recommendation G.702 - defines the digital hierarchy bit rates used by the three frame structures.
- ETS 300 167 - provides the functional characteristics of 2 048 kbit/s interfaces and the basic frame structure used in Clause 4.
- ETS 300 147 - provides the SDH multiplexing structure and the frame alignment pattern used for FA1/FA2.
- CCITT Recommendation E.164 - supplies the numbering format used in the trail access point identifier.
- CCITT Recommendation T.50 - supplies the character set used to carry the E.164 numbering string.
- CCITT Recommendation I.432 - is cited in Annex A for ATM cell rate adaptation, HEC generation, cell delineation, and header verification.
What does the SIST ETS 300 337 E1:2003 document contain?
SIST ETS 300 337 E1:2003 contains three rate-specific frame descriptions, path overhead allocations, ATM cell support rules, SDH payload mapping options and a conformance testing clause. It also includes figures that show the frame layouts at 2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s, plus the detailed payload arrangements for TU-12, TUG-2 and TUG-3 support.
Tables in the document define the payload-dependent-bit coding for TU multiframe indication. The text also gives a CRC-7 procedure for the trail trace identifier and describes how the receiver checks it. Annex A then adds the ATM-specific adaptation and verification steps that implementers need when building or testing a transport interface.
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Frequently Asked Questions
SIST ETS 300 337 E1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Transmission and Multiplexing (TM); Generic frame structures for the transport of various signals (including Asynchronous Transfer Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) elements) at the ITU-T Recommendation G.702 hierarchical rates of 2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s". This standard covers: Specifies the way B-ISDN ATM cells are mapped into the various bit rates of the G.702 hierarchy for transport over the PDH network.
Specifies the way B-ISDN ATM cells are mapped into the various bit rates of the G.702 hierarchy for transport over the PDH network.
SIST ETS 300 337 E1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.040.20 - Transmission systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 337 E1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2003
3UHQRVLQPXOWLSOHNVLUDQMH 70 ±*HQHULþQHVWUXNWXUHRNYLUD]DSUHQRVUD]OLþQLK
VLJQDORY YNOMXþQRVFHOLFDPLDVLQKURQHJDSUHQRVQHJDQDþLQD $70 LQHOHPHQWL
VLQKURQHGLJLWDOQHKLHUDUKLMH 6'+ SULKLHUDUKLþQLKKLWURVWLKNELWV
NELWVLQ NELWVSRSULSRURþLOX&&,77*
Transmission and Multiplexing (TM); Generic frame structures for the transport of various
signals (including Asynchronous Transfer Mode (ATM) cells and Synchronous Digital
Hierarchy (SDH) elements) at the ITU-T Recommendation G.702 hierarchical rates of 2
048 kbit/s, 34 368 kbit/s and 139 264 kbit/s
Ta slovenski standard je istoveten z: ETS 300 337 Edition 1
ICS:
33.040.20 Prenosni sistem Transmission systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 337
TELECOMMUNICATION February 1995
STANDARD
Source: ETSI TC-TM Reference: DE/TM-03007
ICS: 33.080
Transmission, ATM, SDH
Key words:
Transmission and Multiplexing (TM);
Generic frame structures for the transport of various signals
(including Asynchronous Transfer Mode (ATM) cells
and Synchronous Digital Hierarchy (SDH) elements)
at the CCITT Recommendation G.702 hierarchical rates of
2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.
New presentation - see History box
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ETS 300 337: February 1995
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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ETS 300 337: February 1995
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .8
4 Frame structure at 2 048 kbit/s .8
4.1 Basic frame structure.8
4.2 Support of ATM cells in 2 048 kbit/s .8
5 Frame structure at 34 368 kbit/s .9
5.1 Basic frame structure.9
5.1.1 General.9
5.1.2 Path overhead .10
5.2 Support of ATM cells in 34 368 kbit/s .12
5.3 Support of 14 SDH TU-12's in 34 368 kbit/s.12
5.3.1 Coding of payload dependent bits for TU multiframe indication.13
6 Frame structure at 139 264 kbit/s .14
6.1 Basic frame structure.14
6.1.1 General.14
6.1.2 Path overhead .15
6.2 Support of ATM cells in 139 264 kbit/s .17
6.3 Support of SDH elements in 139 264 kbit/s.17
6.3.1 Coding of payload dependent bits for TU multiframe indication.18
6.3.2 Support of 20 x TUG-2 .18
6.3.3 Support of 2 x TUG-3 and 5 x TUG-2 .18
7 Conformance testing .19
Annex A (informative): Functions specific to the support of ATM cells.20
A.1 Cell rate adaptation .20
A.2 Header Error Control (HEC) generation.20
A.3 Cell delineation.20
A.4 Cell header verification and extraction .20
Annex B (informative): Bibliography.21
History.22
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ETS 300 337: February 1995
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ETS 300 337: February 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Transmission and
Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS specifies generic frame structures for the transport of various signals at the CCITT
Recommendation G.702 [1] hierarchical rates of 2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s. The
support of Asynchronous Transfer Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) Tributary
Units (TUs) in the Plesiochronous Digital Hierarchy (PDH) bit rates is also covered in this ETS.
Transposition dates
Date of latest announcement of this ETS (doa): 31 May 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 November 1995
Date of withdrawal of any conflicting National Standard (dow): 30 November 1995
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ETS 300 337: February 1995
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ETS 300 337: February 1995
1 Scope
This European Telecommunication Standard (ETS) specifies generic frame structures for the transport of
various signals at the CCITT Recommendation G.702 [1] hierarchical rates of 2 048 kbit/s, 34 368 kbit/s
and 139 264 kbit/s. The support of Asynchronous Transfer Mode (ATM) cells and Synchronous Digital
Hierarchy (SDH) Tributary Units (TUs) in the Plesiochronous Digital Hierarchy (PDH) bit rates is covered
in this ETS. Functions specific to the support of ATM cells performed in the transmitter and receiver are
not part of this interface standard but are given for information in annex A.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] CCITT Recommendation G.702 (1988): "Digital hierarchy bit rates".
[2] ETS 300 167: "Transmission and Multiplexing (TM); Functional characteristics of
2 048 kbit/s interfaces".
[3] ETS 300 147 (1992): "Transmission and Multiplexing (TM); Synchronous digital
hierarchy; Multiplexing structure".
[4] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[5] CCITT Recommendation T.50 (1992): "International Reference Alphabet (IRA),
Information technology - 7-bit coded character set for information interchange".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
idle cell: A cell which is inserted and extracted by the adaptation function between the ATM virtual path
layer network and the PDH path layer network in order to adapt the cell flow rate to the available payload
capacity of the PDH path used.
valid cell: A cell whose header is declared by the cell Header Error Control (HEC) process to be free of
errors.
NOTE: The order of transmission of information in all diagrams in this ETS is first from left to
right and then top to bottom. Within each byte the most significant bit is transmitted
first. The most significant bit (bit 1) is illustrated at the left of all diagrams.
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ETS 300 337: February 1995
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ATM Asynchronous Transfer Mode
BIP-8 Bit Interleaved Parity - 8
CRC Cyclic Redundancy Check
ETSI European Telecommunications Standards Institute
HEC Header Error Control
IEC Incoming Error Count
REI Remote Error Indication
RDI Remote Defect Indication
MSB Most Significant Bit
OAM Operations, Administration and Maintenance
PDH Plesiochronous Digital Hierarchy
SDH Synchronous Digital Hierarchy
TS Time Slot
TTI Trail Trace Identifier
TU Tributary Unit
TU-x Tributary Unit - x
TUG-n Tributary Unit Group of level n
4 Frame structure at 2 048 kbit/s
4.1 Basic frame structure
The basic frame structure at 2 048 kbit/s as described in ETS 300 167 [2] shall be used. This comprises a
generic path overhead and a generic payload capacity of 1 984 kbit/s.
4.2 Support of ATM cells in 2 048 kbit/s
Valid or idle cells are supported in bits 9 to 128 and bits 137 to 256 of the 2 048 kbit/s frame with the octet
structure of the cells aligned with the octet structure of the frame (see figure 1). Bits 129 to 136
correspond to Time Slot 16 (TS 16) in an octet structured frame and are reserved for future use. Valid or
idle cells occupy the whole of the payload and a cell can cross a 125 μs frame boundary. The ATM cell
payload is scrambled using a self-synchronizing scrambler with the generator polynomial x + 1. Cell
payload field scrambling is required to provide security against false cell delineation and to prevent the cell
payload replicating the 2 048 kbit/s frame alignment word.
TS0 TS 16
bits 1-8 bits 129-136
path overhead reserved for signalling
9 bit numbers 128 137 bit num bers 256
Figure 1: Frame structure at 2 048 kbit/s
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ETS 300 337: February 1995
5 Frame structure at 34 368 kbit/s
5.1 Basic frame structure
5.1.1 General
The basic frame structure at 34 368 kbit/s comprises 7 octets of generic path overhead and 530 octets of
payload capacity per 125 μs as shown in figure 2.
59 columns
FA1 FA2
EM
TR
MA
530 octets
r
payload
NR o
w
s
GC
Figure 2: Frame structure at 34 368 kbit/s
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ETS 300 337: February 1995
5.1.2 Path overhead
The values and allocation of the path overhead are shown in figure 3 and are described below.
1 1 10 1 100 0 1 0 1 0 0 0
FA1 1 FA2
BIP-8
EM
TRAIL TRAC E
TR
Payload Tim ing
MA
Payload T .ype
RDI
REI
Dep Marker
NR
NR
GC
GC
FA1/FA2: Frame Alignment signal, this has the same pattern as defined in clause 7 of
ETS 300 147 [3].
EM: Error Monitoring, BIP-8. One byte is allocated for path error monitoring. This function
shall be a BIP-8 code using even parity. The path BIP-8 is calculated over all bits of the
previous 125 μs frame. The computed BIP-8 is placed in the EM byte of the current
125 μs frame.
TR: Trail trace. This byte is used to repetitively transmit a trail access point identifier so that
a trail receiving terminal can verify its continued connection to the intended transmitter.
The trail access point identifier shall use the 16-byte CCITT Recommendation
E.164 [4] numbering format described below.
Figure 3: Path overhead at 34 368 kbit/s
Trail access point identifier format:
- a 16-byte frame is defined for the transmission of the CCITT Recommendation E.164 [4]
numbering. The first byte of the string is a frame start marker and includes the result of a CRC-7
calculation over the previous frame. The following 15 bytes are used for the transport of 15 CCITT
Recommendation T.50 [5] characters required for the CCITT Recommendation E.164 [4]
numbering format. The 16-byte frame is given below:
1C CCCCCC : frame start marker;
1 7
0XXXXXXX: byte 2;
0XXXXXXX: byte 16;
0XXXXXXX: CCITT Recommendation T.50 [5] character of the CCITT Recommendation
E.164 [4] string;
C CCCCCC : result of the CRC-7 calculation over the previous frame.
1 7
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ETS 300 337: February 1995
The description of the CRC-7 calculation is given below.
Multiplication/division process
A particular CRC-7 word is the remainder after multiplication by x and then division (modulo 2) by the
7 3
generator polynomial x + x + 1, of the polynomial representation of the previous Trail Trace Identifier
(TTI) multiframe.
When representing the contents of the block as a polyno
...