SIST ES 201 803-2-1 V1.1.1:2005

SLOVENSKI STANDARD
01-januar-2005
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Dynamic synchronous Transfer Mode (DTM); Part 2: System characteristics; Sub-part 1:
Data link aspects
Ta slovenski standard je istoveten z: ES 201 803-2-1 Version 1.1.1
ICS:
33.040.40 Podatkovna komunikacijska Data communication
omrežja networks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETSI Standard
Dynamic synchronous Transfer Mode (DTM);
Part 2: System characteristics;
Sub-part 1: Data link aspects
�
2 ETSI ES 201 803-2-1 V1.1.1 (2002-10)

Reference
DES/SPAN-130005-1
Keywords
addressing, DTM
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© European Telecommunications Standards Institute 2002.
All rights reserved.
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ETSI
3 ETSI ES 201 803-2-1 V1.1.1 (2002-10)
Contents
Intellectual Property Rights.7
Foreword.7
Introduction .7
1 Scope.8
2 References.8
3 Definitions and abbreviations.8
3.1 Definitions.8
3.2 Abbreviations.10
4 Data link management system overview.10
4.1 Physical interfaces and physical links .11
4.2 Bypass chains.11
4.3 Control Services.13
4.4 Topology Management.13
4.5 Resource Management.13
5 Slot-0 Service.13
5.1 Functionality.13
5.1.1 The Slot-0 data transport.13
5.1.2 Control traffic over Slot-0.13
5.2 Characteristics.14
5.3 Addressing.14
5.4 Client Selection.14
5.5 Slot-0 message and header formats .14
6 Bypass chain topology management .14
6.1 Bypass chain topology management overview.14
6.1.1 Void.14
6.1.2 Topology discovery algorithm.14
6.1.3 Bypass chain monitoring.15
6.2 Service interfaces.15
6.2.1 Service provided.15
6.2.2 Service required.16
6.3 Detailed protocol description.16
6.3.1 Establishing connections.16
6.3.1.1 Probing phase.17
6.3.1.2 Return physical interface.17
6.3.1.3 Detection phase.18
6.3.1.4 Confirmation phase.18
6.3.1.5 Distribution phase.19
6.3.1.6 Messages distribution.19
6.3.2 Information Distribution Phase.19
6.3.2.1 Information propagation.21
6.3.2.2 Ending the distribution.21
6.3.2.3 Detecting rings.21
6.3.2.4 Sending out node lists .22
6.3.3 Topology calculation.22
6.3.3.1 Informing DLSP's clients .22
6.3.3.2 Informing the RXprocesses about valid return physical interfaces.22
6.4 Messages.23
6.4.1 Physical interface identifiers field .23
6.4.2 General message format.23
6.4.3 DLSP_PROBE.23
6.4.4 DLSP_PROBE_ACK.24
6.4.5 DLSP_DETECTED.24
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6.4.6 DLSP_DETECTED_ACK.24
6.4.7 DLSP_CONFIRM.25
6.4.8 DLSP_CONFIRM_ACK.25
6.4.9 DLSP_DISTRIBUTE.25
6.4.9.1 DLSP_DISTRIBUTE List Entries .26
6.4.10 DLSP_DISTRIBUTE_ACK.26
6.4.11 DLSP_LINK_ERROR.27
6.5 SDL Descriptions.27
6.5.1 Processes.27
6.5.1.1 Relationships between processes in a node.28
6.5.1.2 Relationships between processes in neighbouring nodes.29
6.5.1.3 DistributeDownstreamProcess.29
6.5.1.3.1 Purpose.29
6.5.1.3.2 Operation.29
6.5.1.3.3 Provided services.29
6.5.1.3.4 Timers.30
6.5.1.4 DistributeUpstreamProcess.30
6.5.1.4.1 Purpose.30
6.5.1.4.2 Operation.30
6.5.1.4.3 Provided services.31
6.5.1.4.4 Timers.31
6.5.1.5 Dispatcher.31
6.5.1.6 TXprocess.31
6.5.1.6.1 Purpose.31
6.5.1.6.2 Operation.31
6.5.1.6.3 Provided services.32
6.5.1.6.4 Timers.32
6.5.1.7 RXprocess.33
6.5.1.7.1 Purpose.33
6.5.1.7.2 Operation.33
6.5.1.7.3 Provided services.34
6.5.1.7.4 Timers.34
6.5.1.8 BCManager.34
6.5.1.8.1 Purpose.34
6.5.1.8.2 Operation.34
6.5.1.8.3 Timers.35
6.5.2 Data types.35
6.5.3 Functions.35
6.5.3.1 IsBypassOk.35
6.5.3.2 RecalcTopology.35
6.5.4 Constants.35
6.5.4.1 DLSP_MAX_HOPCOUNT.35
6.5.4.2 DLSP_MAX_CONFIRM_TRIES.36
6.5.4.3 DLSP_MIN_PROBE.36
6.5.4.4 DLSP_TIMEOUT_DISTRIBUTE.36
6.5.4.5 DLSP_TIMEOUT_CONFIRM_IN.36
6.5.4.6 DLSP_TIMEOUT_CONFIRM_OUT'.36
6.5.4.7 DLSP_TIMEOUT_FIRSTCONFIRM_IN.36
6.5.4.8 DLSP_TIMEOUT_DETECTED.36
6.5.4.9 DLSP_PERIOD_PROBE.36
6.5.4.10 DLSP_PERIOD_CONFIRM_OUT.36
6.5.4.11 Timer values.36
7 Control channel management.37
7.1 Overview.37
7.2 Void.38
7.3 DTM Control Forwarding & Filtering Service.38
7.3.1 Functionality.38
7.3.1.1 Handling of messages.38
7.3.2 Characteristics.38
7.3.3 Addressing.39
7.3.4 Client Selection.39
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7.4 Messages and Headers.39
7.4.1 The DCFF Tunnel Header .39
7.5 DCC Service.39
7.5.1 Functionality.39
7.5.1.1 Signalling path.40
7.5.1.2 Route path finding.41
7.5.1.3 Establishment and Removal of control channels.42
7.5.1.4 Message filtering.45
7.5.2 Characteristics.45
7.5.2.1 Sending messages in the direction of the bypass chain.45
7.5.2.2 Sending messages in opposite direction of a bypass chain .45
7.5.3 Addressing.45
7.5.3.1 Sending messages along a bypass chain.45
7.5.3.2 Sending messages in opposite direction of a bypass chain .45
7.5.4 Client Selection.45
7.5.5 DCC message and header format.45
7.5.5.1 Payload of DCC clients.46
7.5.5.2 DCC FLUSH message .46
7.5.5.3 DCC Source Address Header.46
7.5.5.4 DCC Route header .46
7.5.5.5 DCC Tear Down .47
7.5.6 DCFF message and header formats .47
7.5.6.1 DCFF Tunnel Header.47
8 Resource management.48
8.1 System overview.48
8.1.1 Functional overview.48
8.1.1.1 Resource ownership.48
8.1.1.2 Borrowing.48
8.1.1.3 Resource announcement.48
8.1.1.4 Probe mechanism.48
8.1.2 Fault management.49
8.1.2.1 Borrowing failed.49
8.1.2.2 Ownership overlapping.49
8.1.2.3 Loss of access tokens .49
8.1.2.4 Tokens allocated by several nodes .49
8.2 Concepts.50
8.2.1 Terminology.50
8.2.1.1 Allocation domain.50
8.2.1.2 Short circuit.50
8.2.1.3 Probe.51
8.2.1.4 Borrowing and lending of token(s) .52
8.2.1.5 Ownership of tokens .52
8.2.1.6 Access to token(s) .52
8.2.1.7 DRMP_GATHER.52
8.2.1.8 DRMP_SYNC.52
8.2.1.9 Start up.52
8.2.1.10 Master physical interface .52
8.2.1.11 Transitional master physical interface.53
8.2.1.12 Probe.53
8.2.1.13 Topology.53
8.2.1.14 Fairness algorithm.53
8.2.1.15 Range change.53
8.2.1.16 Double booking.53
8.2.1.17 Quark.53
8.2.1.18 Got ownership.53
8.2.1.19 Lost ownership.53
8.2.1.20 Alloc.53
8.2.1.21 Dealloc.53
8.2.1.22 Fragmentation.54
8.3 Detailed protocol description.54
8.3.1 The Quark machine.54
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8.3.1.1 Simplified diagram.54
8.3.1.2 Events.55
8.3.1.3 States.55
8.3.1.4 Void.55
8.3.1.5 State transition tables .55
8.3.1.5.1 Free.55
8.3.1.5.2 Busy.56
8.3.1.5.3 Lent.56
8.3.1.5.4 Gone.57
8.3.1.5.5 Borrowed.57
8.3.1.5.6 Probing.57
8.3.2 The Dynamic Ownership state machine .58
8.3.2.1 Typical scenarios.58
8.3.2.2 Transition diagrams.60
8.3.2.3 State types.60
8.3.2.4 State variables.60
8.3.2.5 Queries.61
8.3.2.5.1 Probe conditions.61
8.3.2.6 Incoming messages and signals.61
8.3.2.6.1 Bypass Chain Change (BCC) .61
8.3.2.6.2 RangeChange.61
8.3.2.7 Signals and messages.62
8.3.2.7.1 DRMP_SYNC message.62
8.3.2.7.2 DRMP_GATHER.63
8.3.2.8 Outgoing Messages.64
8.3.2.8.1 DRMP_DIST_OWN.64
8.3.2.9 Timeouts.64
8.3.2.9.1 (Re) send DRMP_GATHER .64
8.3.2.10 Distribution and calculation of ownership ranges .64
8.4 Message formats.65
8.4.1 Generic fields.65
8.4.1.1 Physical interface identifiers field.65
8.4.1.2 Slot fragment.66
8.4.1.3 Long slot fragment.66
8.4.1.4 Generic header.66
8.4.2 Statistical information.67
8.4.2.1 DRMP_RESOURCE_ANNOUNCE (Dynamic ownership).67
8.4.2.2 DRMP_RESOURCE_ANNOUNCE (Static ownership) .67
8.4.3 Access token passing .68
8.4.3.1 DRMP_TOKEN_REQUEST.68
8.4.3.2 DRMP_TOKEN_TRANSFER.69
8.4.3.3 DRMP_TOKEN_RETURN.69
8.4.3.4 DRMP_PROBE.70
8.4.3.5 DRMP_PROBE_REPLY.70
8.4.4 Ownership passing.71
8.4.4.1 DRMP_SYNC.72
8.4.4.2 DRMP_GATHER.72
8.4.4.3 DRMP_KILL.73
Annex A (normative): SDL model .74
Annex B (informative): Bibliography.75
History .76

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7 ETSI ES 201 803-2-1 V1.1.1 (2002-10)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Services and Protocols for Advanced
Networks (SPAN).
The present document is part 2, sub-part 1 of a multi-part deliverable covering Dynamic synchronous Transfer Mode
(DTM), as identified below:
Part 1: "System description";
Part 2: "System characteristics";
Sub-part 1: "Data link aspects";
Sub-part 2: "Network aspects";
Sub-part 3: "Transport network and channel adaptation aspects";
Part 3: "Physical protocol";
Part 4: "Mapping of DTM frames into SDH containers";
Part 5: "Mapping of PDH over DTM";
Part 6: "Mapping of SDH over DTM";
Part 7: "Ethernet over DTM Mapping";
Part 8: "Mapping of Frame relay over DTM";
Part 9: "Mapping of ATM over DTM";
Part 10: "Routeing and switching of IP flows over DTM";
Part 11: "Mapping of video streams over DTM";
Part 12: "Mapping of MPLS over DTM";
Part 13: "System description of sub-rate DTM";
Part 14: "Network management".
Introduction
The present document describes the architecture and protocols of signalling and maintenance on the data link layer of
the DTM system.
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8 ETSI ES 201 803-2-1 V1.1.1 (2002-10)
1 Scope
The present document:
• establishes a system for bypass chain management;
• specifies the characteristics of bypass chain management;
• establishes a system for control signalling;
• specifies the characteristics of control signalling;
• establishes a system for bypass chain resource management;
• specifies the characteristics of bypass chain resource management.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
[1] ETSI TR 101 287: "Services and Protocols for Advanced Networks (SPAN); Terms and
Definitions".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
access token: right to use a slot for transmitting data on a physical interface for a certain number of bypass hops
address, DTM address: 64 bit numerical value that uniquely identifies a node in a DTM network
NOTE: See further anycast address and multicast address.
allocation domain: same as a bypass chain where, if the topology is point-to-point or bus, the last node is not counted
as member of the AD
Bypass Chain (BC): series of concatenated physical links, where data can be transported end-to-end using bypass
switching
bypass switching: space switching of slots from a receiver to a transmitter on the same physical interface on a per slot
basis
channel: set of slots allocated from one source Access node to one or more destination Access nodes in a network
NOTE: The source and destination Access nodes can be the same, i.e. the channel is internal to the node.
channel adaptation: channel path termination function that provides an adaptation between the DTM slot based service
and some other traffic service (such as word stream, bit stream or asynchronous packets)
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9 ETSI ES 201 803-2-1 V1.1.1 (2002-10)
Channel Multiplexing Identifier (CMI): identifier by DCAP-1 used for multiplexing packets of different protocols on
a single channel
control channel: channel used for DTM control signalling
data channel: channel used for transport data between interworking functions
DTM network address, DTM address: See definition of "address, DTM address".
DTM Service Type (DST): identifying the type of interworking function to be associated with the channel
DTM Service Type Instance (DSTI): identifying which interworking function of a specific type to be addressed by the
channel
physical interface address: globally unique identifier of a physical interface that is represented as a 48-bit MAC
address
master physical interface: physical interface in the allocation domain having the lowest physical interface address
multicast address: address used to represent all nodes belonging to a multicast group
network address: an address to be used in the network layer of the ISO OSI model
NOTE 1: A network address may take on different forms depending on which protocol is being used in the network
layer.
NOTE 2: See also DTM network address.
node: network element containing DTM functions
node control channel: dynamically established control channel from one node to one or more other nodes on the same
bypass chain
node identity: identifier that uniquely identifies a node over a global scope
ownership: responsibility to supervise an access token of a slot
physical interface: interface between two equipments
NOTE: Adopted from TR 101 287 [1].
physical link: unidirectional connection between the transmitter of one physical interface and the receiver of another
physical interface
quark: smallest resource unit that is one slot wide and one physical link long
NOTE: Used to model dynamic resource management on a bypass c
...