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CISCO-ADSL-DMT-LINE-MIB.mib
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CISCO-ADSL-DMT-LINE-MIB.mib
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-- *****************************************************************
-- Description of managed objects for ADSL DMT line interfaces.
--
-- March 1999, Patrick Gili
-- August 2000, Andy Spooner
-- February 2001, Manish Bakshi
--
-- Copyright (c) 1999, 2000, 2001 by cisco Systems, Inc.
-- All rights reserved.
-- *****************************************************************
CISCO-ADSL-DMT-LINE-MIB DEFINITIONS ::= BEGIN
IMPORTS
Integer32,
MODULE-IDENTITY,
OBJECT-TYPE FROM SNMPv2-SMI
Unsigned32 FROM CISCO-TC
TEXTUAL-CONVENTION,DateAndTime,
TruthValue FROM SNMPv2-TC
MODULE-COMPLIANCE,
OBJECT-GROUP FROM SNMPv2-CONF
ciscoMgmt FROM CISCO-SMI
adslLineConfProfileName,
adslLineAlarmConfProfileName FROM ADSL-LINE-MIB
ifIndex, InterfaceIndexOrZero FROM IF-MIB;
ciscoAdslDmtLineMIB MODULE-IDENTITY
LAST-UPDATED "200105171600Z"
ORGANIZATION "Cisco Systems, Inc."
CONTACT-INFO "Cisco Systems
Customer Service
Postal: 170 W Tasman Drive
San Jose, CA 95134
Tel: +1 800 553-NETS
E-mail: cs-dslam@cisco.com"
DESCRIPTION
"This MIB module serves as an enterprise-specific extension of
the ADSL-LINE-MIB. The structure of this MIB module shadows
the structure of the ADSL-LINE-MIB, table for table. The tables
defined by this MIB module contain managed objects that meet the
following criteria:
1) A managed object represents an attribute or characteristic
specific to DMT (Digital Multi-Tone) modems.
2) The ADSL-DMT-LINE-MIB does not already contain a managed
object representing the same information as a managed
object.
Observe that entries contained by the tables in this MIB module
do not augment the corresponding entries in the ADSL-LINE-MIB,
as every modem represented by the ADSL-LINE-MIB is not
necessarily a DMT modem.
Also observe that entries contained by the tables in this MIB
module do not augment the corresponding entries in the
ADSL-DMT-LINE-MIB, as this assumes that the ADSL-DMT-LINE-MIB
defines tables that correspond to every table defined by the
ADSL-LINE-MIB. At this time, this assumption does not hold
true.
*** DEFINITIONS ***
AGGREGATE DATA RATE
Data rate transmitted by an ADSL system in any one
direction. This includes both net data rates and overhead
used by the system, including:
- EOC
- AOC (ADSL Overhead Control channel)
- CRC (Cyclic Redundancy Check) check bytes
- fixed indicator bits for OAM (Operatings,
Administration, and Maintenance)
- synchronization control bytes
- capacity for bearer channel synchronization control
BEARER CHANNEL
A user data stream of a specific data rate that is
transported transparently by an ADSL system over one of the
simplex channels (i.e., AS0, AS1, AS2, or AS3) or one of the
duplex channels (i.e., LS0, LS1, or LS2).
BIN
DMT line coding divides the frequency spectrum above the
voice band of a line (i.e., 0-4 kHz) into 255 sub-carriers,
each supporting 4.3125 kHz of bandwidth. A 'bin' refers to
a single sub-carrier.
DATA SYMBOL RATE
The average symbol rate (after allowing for the overhead of
the sync symbol) at which symbols carrying data are
transmitted; that is, 4000 symbols/second.
DOWNSTREAM
The flow of data in the direction from the ATU-C to ATU-R.
LINE RATE
The total data rate supported by a line; that is,
(sum of b(i) for all i) * 4 kbps.
MARGIN (also referred to as 'SNR margin')
The difference between the SNR of the received signal and
the SNR required to provide a BER of 10E-7.
NET DATA RATE
The data rate that is available for user data in any one
direction; for the downstream direction this is the sum of
the simplex and duplex bearer channel rates.
SPLITTER
Filters that separate the high frequency signals (ADSL)
from the voice band signals; (frequently called POTS
splitters even though the voice band signals may comprise
more than just POTS).
SYMBOL
The number of bits the transmitter is capable of
multiplexing and modulating over all the bins in a single
signalling interval.
SYMBOL RATE
The rate at which all symbols, including the sync
symbol, are transmitted; that is, (69/68) * 4000
symbols/sec; contrasted with the data symbol rate.
TOTAL DATA RATE
The aggregate data rate (q.v.) plus Reed-Solomon FEC
overhead.
UPSTREAM
The flow of data in the direction from the ATU-R to ATU-C.
*** ABBREVIATIONS, ACRONYMS, AND SYMBOLS ***
ADSL - Asymmetric Digital Subscriber Line.
ATM - Asynchronous Transfer Mode.
ATU-C - ADSL Transceiver Unit, Central Office end.
ATU-R - ADSL Transceiver Unit, Remote terminal end.
b(i) - the number of bits (i.e., constellation size) modulated
on bin i.
BER - Bit Error Ratio.
DMT - Discrete MultiTone.
DSL - Digital Subscriber Line.
EOC - Embedded Operations Channel.
FEC - Forward Error Correction.
SNR - Signal-to-Noise Ratio.
STM - Synchronous Transfer Mode."
REVISION "200105171600Z"
DESCRIPTION
"Added new table for AtucDmtBin and AturDmtBin information.
Added two attributes to the profile:
cAdslAtucDmtConfMinrateBlock and
cAdslAtucDmtDualBitmapEnabled"
REVISION "200008220000Z"
DESCRIPTION
"Added new value for DmtCodewordSize to allow the
setting of DmtCodewordSize to 1/2 symbols per codeword."
REVISION "200005190000Z"
DESCRIPTION
"Updated cAdslLineDmtConfOperatingMode object to
support G.992.1, G.992.2 and T1.413 enumerations.
Also added descriptions for the above."
REVISION "9903300000Z"
DESCRIPTION
"Initial version of this MIB module."
::= { ciscoMgmt 130 }
DmtOverheadFraming ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"There exist two types of ADSL framing: full overhead and
reduced overhead. Furthermore, there exist two versions of
full overhead and two versions of reduced overhead. The
table below defines the four resulting framing structures:
'structure0' Full overhead framing with asynchronous
bit-to-modem timing (enabled synchronization
control mechanism).
'structure1' Full overhead framing with synchronous
bit-to-modem timing (disabled synchronization
control mechanism).
'structure2' Reduced overhead framing with separate fast
and sync bytes in fast and interleaved latency
buffers respectively (64 kbps framing overhead).
'structure3' Reduced overhead framing with merged fast and
sync byte, using either the fast or interleaved
latency buffer (32 kbps framing overhead).
During the training sequence, the ATU-C shall indicate the
highest framing structure number that it supports. It is
implied that if the ATU-C indicates it supports framing
structure k, it also supports all framing structures 0 to k-1.
If during the training sequence the ATU-R indicates a lower
framing structure than that specified by the ATU-C, the ATU-C
shall fall back to the framing structure number indicated by
the ATU-R.
Management requirements drive the determination of overhead,
full or reduced. Full overhead provides more bandwidth to the
EOC channel, thereby enabling higher polling rates. However,
reduced overhead provides enough bandwidth to satisfy typical
applications.
If an ADSL line is supporting an ATM link, then a structure
must be chosen that disables synchronization control.
If an ADSL line is supporting an STM link, and the ADSL line
interface has a clock tightly coupled to the stratum clock,
then synchronization control is not necessary.
If an ADSL line is supporting an STM link, and the ADSL line
interface is driven by a clock that has no relationship with
the stratum clock, then a struture that enables synchronization
control is necessary."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
SYNTAX INTEGER {
structure0(0),
structure1(1),
structure2(2),
structure3(3)
}
DmtFecSize ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"One of the three parameters that affects FEC operation; the
number of FEC redundancy bytes per Reed-Solomon codeword. The
codeword size also affects FEC operation. The interleave depth
also affects FEC operation on an interleaved channel (see the
ADSL-LINE-MIB, specifically adslAtucChanConfMaxInterleaveDelay
and adslAturChanConfMaxInterleaveDelay)."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces.
draft-ietf-adslmib-adsllinemib-04, Definitions of Managed
Objects for ADSL Lines."
SYNTAX INTEGER (0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16)
DmtCodewordSize ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"One of the three parameters that affects FEC operation; the
number of ADSL symbols per FEC codeword. The FEC size also
affects FEC operation. The interleave depth also affects FEC
operation on an interleaved channel (see the ADSL-LINE-MIB,
specifically adslAtucChanConfMaxInterleaveDelay
and adslAturChanConfMaxInterleaveDelay).
The following constraints apply:
- This value is always '1' when performing the FEC operation
on a fast buffer.
- When performing the FEC operation on an interleaved buffer,
the specification does not require a codeword size greater
than '1' when the interleave depth is set to '1'.
- if DmtCodeWordSize is positive, it represents the actual
number of symbols per codeword. If DmtCodeWordSize is
negative, it represents the exponent value in a power
of 2. For example, if DmtCodeWordSize is equal to -1,
then the number of symbols per codeword would be equal
to 2^^-1 = 1/2."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces.
RFC 2662 - Definitions of Managed Objects for the ADSL Lines.
G. Bathrick,. Ly. August 1999. "
SYNTAX INTEGER (-1 | 1 | 2 | 4 | 8 | 16)
-- MIB Objects Definitions
ciscoAdslDmtLineMIBObjects OBJECT IDENTIFIER ::=
{ ciscoAdslDmtLineMIB 1 }
-- ADSL DMT Line Table
cAdslDmtLineTable OBJECT-TYPE
SYNTAX SEQUENCE OF CAdslDmtLineEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table extends the adslLineTable and contains enterprise-
specific common attributes describing both ends of ADSL lines
supported by the system."
::= { ciscoAdslDmtLineMIBObjects 1 }
cAdslDmtLineEntry OBJECT-TYPE
SYNTAX CAdslDmtLineEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of enterprise-specific common attributes describing both
ends of an ADSL line supported by the system. There exists an
entry for each ifEntry with an ifType of adsl(94)."
INDEX { ifIndex }
::= { cAdslDmtLineTable 1 }
CAdslDmtLineEntry ::= SEQUENCE {
cAdslDmtLineOverheadFraming DmtOverheadFraming
}
cAdslDmtLineOverheadFraming OBJECT-TYPE
SYNTAX DmtOverheadFraming
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object represents the negotiated overhead framing
structure being used by the ATU-C and ATU-R."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
::= { cAdslDmtLineEntry 1 }
-- ADSL ATU-C DMT Physical-Layer Parameters Table
cAdslAtucDmtPhysTable OBJECT-TYPE
SYNTAX SEQUENCE OF CAdslAtucDmtPhysEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table extends the adslAtucPhysTable and contains
enterprise-specific physical layer parameters for ATU-C
class devices supported by the system."
::= { ciscoAdslDmtLineMIBObjects 2 }
cAdslAtucDmtPhysEntry OBJECT-TYPE
SYNTAX CAdslAtucDmtPhysEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of enterprise-specific physical-layer parameters for an
ATU-C class device supported by the system. There exists an
entry for each ifEntry with an ifType of adsl(94)."
INDEX { ifIndex }
::= { cAdslAtucDmtPhysTable 1 }
CAdslAtucDmtPhysEntry ::= SEQUENCE {
cAdslAtucDmtState INTEGER
}
cAdslAtucDmtState OBJECT-TYPE
SYNTAX INTEGER {
standard(1),
unknown(2),
downloading(3),
downloadFailed(4),
testing(5)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of this object specifies the enterprise-specific
specific status of the ATU-C. If the value of adslAtucDMTState
is not 'other', then the value of this object is 'standard'.
If the value of adslAtucDMTState is 'other', and the ATU-C
is in an unrecognized state, then the value of this object
is 'unknown'. If the value of adslAtucDMTState is 'other',
and the ATU-C is not in an unrecognized state, then the value
of this object specifies the enterprise-specific state of the
ATU-C."
REFERENCE
"ADSL Forum Technical Specification TR-014, DMT Line Code
Specific MIB."
::= { cAdslAtucDmtPhysEntry 1 }
-- ADSL ATU-C DMT Channel Parameters Table
cAdslAtucDmtChanTable OBJECT-TYPE
SYNTAX SEQUENCE OF CAdslAtucDmtChanEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table extends the adslAtucChanTable and contains
enterprise-specific physical layer parameters for the ATU-C
channels supported by the system."
::= { ciscoAdslDmtLineMIBObjects 4 }
cAdslAtucDmtChanEntry OBJECT-TYPE
SYNTAX CAdslAtucDmtChanEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of enterprise-specific physical-layer parameters for an
ATU-C channel supported by the system. There exists an entry
for each ifEntry with an ifType of adslInterleave(124) or
adslFast(125)."
INDEX { ifIndex }
::= { cAdslAtucDmtChanTable 1 }
CAdslAtucDmtChanEntry ::= SEQUENCE {
cAdslAtucDmtChanFecSize DmtFecSize,
cAdslAtucDmtChanCodewordSize DmtCodewordSize
}
cAdslAtucDmtChanFecSize OBJECT-TYPE
SYNTAX DmtFecSize
UNITS "bytes"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the number of FEC redundancy bytes the
ATU-C appends to downstream on the corresponding channel. The
ATU-C can fallback from the initial value specified for the
corresponding channel (i.e., cAdslAtucDmtConfFastFecSize or
cAdslAtucInterleaveFecSize) based on the aggregate data rate
rate achieved during training."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
::= { cAdslAtucDmtChanEntry 1 }
cAdslAtucDmtChanCodewordSize OBJECT-TYPE
SYNTAX DmtCodewordSize
UNITS "symbols"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the actual number of symbols per
codeword being used by the ATU-C for downstream messages.
The ATU-C and ATU-R negotiate this value during the
training sequence. A value of 0 indicates the
automatic mode."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
::= { cAdslAtucDmtChanEntry 2 }
-- ADSL ATU-R DMT Channel Parameters Table
cAdslAturDmtChanTable OBJECT-TYPE
SYNTAX SEQUENCE OF CAdslAturDmtChanEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table extends the adslAturChanTable and contains
enterprise-specific physical layer parameters for the ATU-R
channels supported by the system."
::= { ciscoAdslDmtLineMIBObjects 5 }
cAdslAturDmtChanEntry OBJECT-TYPE
SYNTAX CAdslAturDmtChanEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of enterprise-specific physical-layer parameters for an
ATU-R channel supported by the system. There exists an entry
for each ifEntry with an ifType of adslInterleave(124) or
adslFast(125)."
INDEX { ifIndex }
::= { cAdslAturDmtChanTable 1 }
CAdslAturDmtChanEntry ::= SEQUENCE {
cAdslAturDmtChanFecSize DmtFecSize,
cAdslAturDmtChanCodewordSize DmtCodewordSize
}
cAdslAturDmtChanFecSize OBJECT-TYPE
SYNTAX DmtFecSize
UNITS "bytes"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the number of FEC redundancy bytes the
ATU-R appends to upstream on the corresponding channel. The
ATU-C can fallback from the initial value specified for the
corresponding channel (i.e., cAdslAturDmtConfFastFecSize or
cAdslAturInterleaveFecSize) based on the aggregate data rate
achieved during training."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
::= { cAdslAturDmtChanEntry 1 }
cAdslAturDmtChanCodewordSize OBJECT-TYPE
SYNTAX DmtCodewordSize
UNITS "symbols"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the actual number of symbols per
codeword being used by the ATU-R for upstream messages.
The ATU-C and ATU-R negotiate this value during the
training sequence."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
::= { cAdslAturDmtChanEntry 2 }
-- Configuration Profile Table
cAdslDmtLineConfProfileTable OBJECT-TYPE
SYNTAX SEQUENCE OF CAdslDmtLineConfProfileEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table extends the adslLineConfProfileTable and contains
enterprise-specific ADSL DMT line configuration information."
::= { ciscoAdslDmtLineMIBObjects 14 }
cAdslDmtLineConfProfileEntry OBJECT-TYPE
SYNTAX CAdslDmtLineConfProfileEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A configuration profile containing enterprise-specific ADSL DMT
line configuration information."
INDEX { IMPLIED adslLineConfProfileName }
::= { cAdslDmtLineConfProfileTable 1 }
CAdslDmtLineConfProfileEntry ::= SEQUENCE {
cAdslLineDmtConfOperatingMode INTEGER,
cAdslLineDmtConfTrainingMode INTEGER,
cAdslAtucDmtConfFastFecSize DmtFecSize,
cAdslAtucDmtConfInterleaveFecSize DmtFecSize,
cAdslAtucDmtConfCodewordSize DmtCodewordSize,
cAdslAtucDmtConfOverheadFraming DmtOverheadFraming,
cAdslAtucDmtConfBitSwapEnabled TruthValue,
cAdslAtucDmtConfBitSwapFrom Integer32,
cAdslAtucDmtConfBitSwapTo Integer32,
cAdslAturDmtConfInterleaveFecSize DmtFecSize,
cAdslAturDmtConfFastFecSize DmtFecSize,
cAdslAturDmtConfCodewordSize DmtCodewordSize,
cAdslAtucDmtConfMinrateBlock TruthValue,
cAdslAtucDmtDualBitmapEnabled TruthValue
}
cAdslLineDmtConfOperatingMode OBJECT-TYPE
SYNTAX INTEGER {
automatic(1),
splitterless(2),
g992Dot1(3),
g992Dot2(4),
t1Dot413(5)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the line operating mode being employed
by the ADSL line. An ADSL line uses of one of two operating
modes:
- Automatic
An ATU-C that employs this operating mode automatically
detects the capabilities of the ATU-R and utilizes either
a startup sequence specified by G.992.1, G.992.2, or
T1.413-1998. This line operating mode is the default for
an ADSL line.
- Splitterless
This operating mode should no longer be used. It is
equivalent to the G.992.2 selection. Selecting this
mode will automatically map to the G992.2 mode. It is
appropriate in this case that both the ATU-C and ATU-R
support 'heavy' capability but the ATU-C side wishes to
force 'lite' operation. Selecting this mode will
automatically convert to the G992.2 mode.
- G992.1
This operating mode forces the used of the G994.1 startup
sequence and compliance to G992.1 operation.
- G992.2
This operating mode forces the use of the G994.1
startup sequence and compliance to G992.2 operation.
It is appropriate in this case that both the ATU-C and
ATU-R support 'heavy' capability but the ATU-C side
wishes to force 'lite' operation.
- T1.413
This operating mode forces the ATU-R to use the
T1.413-1998 startup sequence."
REFERENCE
"ITU G.992.1, Asymmetric Digital Subscriber Line (ADSL)
Transceiver.
ITU G.992.2, Splitterless Asymmetric Digital Subscriber
Line (ADSL) Transceiver.
ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { automatic }
::= { cAdslDmtLineConfProfileEntry 1 }
cAdslLineDmtConfTrainingMode OBJECT-TYPE
SYNTAX INTEGER {
standard(1),
fast(2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the mode employed by the ATU-C and
ATU-R when training against each other. One of two training
modes can be employed:
- Standard
An ATU-C initiates a training sequence using the method
defined by G.992.1, G.992.2, or T1.413-1998. This training
mode is the default for ADSL modems.
- Fast
An ATU-C initiates a vendor-specific training sequence that
can possibly provide a shorter training sequence."
REFERENCE
"ITU G.992.1, Asymmetric Digital Subscriber Line (ADSL)
Transceiver.
ITU G.992.2, Splitterless Asymmetric Digital Subscriber
Line (ADSL) Transceiver.
ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { standard }
::= { cAdslDmtLineConfProfileEntry 2 }
cAdslAtucDmtConfFastFecSize OBJECT-TYPE
SYNTAX DmtFecSize
UNITS "bytes"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the initial number of FEC redundancy
bytes the ATU-C appends to downstream frames transmitted over
the fast channel during the training sequence. The ATU-C can
fallback from this value depending on the aggregate data rate
achieved during training.
It is desirable to choose a large FEC size, thereby increasing
the chance of being able to correct errors in the data delivered
by a frame. However, additional FEC redundancy bytes increases
frame overhead, and thus frame latency."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { 16 }
::= { cAdslDmtLineConfProfileEntry 3 }
cAdslAtucDmtConfInterleaveFecSize OBJECT-TYPE
SYNTAX DmtFecSize
UNITS "bytes"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the initial number of FEC redundancy
bytes the ATU-C appends to downstream frames transmitted over
the interleaved channel during the training sequence. The
ATU-C can fallback from this value depending on the aggregate
data rate achieved during training.
It is desirable to choose a large FEC size, thereby increasing
the chance of being able to correct errors in the data delivered
by a frame. However, additional FEC redundancy bytes increases
frame overhead, and thus frame latency.
The value of this object must be a integral multiple of the
value of cAdslAtucDmtConfCodewordSize."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { 16 }
::= { cAdslDmtLineConfProfileEntry 4 }
cAdslAtucDmtConfCodewordSize OBJECT-TYPE
SYNTAX DmtCodewordSize
UNITS "symbols"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the number of symbols per codeword being
used by the ATU-C for downstream messages on an interleaved
channel during the training sequence. The ATU-C can fallback
from this value based on the aggregate data rate achieved during
training.
It is desirable to choose a large codeword size to minimize
overhead. However, increasing the codeword size increases the
possibility of not being able to correct errors in the data
delivered by a frame."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { 16 }
::= { cAdslDmtLineConfProfileEntry 5 }
cAdslAtucDmtConfOverheadFraming OBJECT-TYPE
SYNTAX DmtOverheadFraming
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the overhead framing structure which the
ATU-C will request when establishing a link with the ATU-R.
The value of 'structure0' is not valid."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { structure3 }
::= { cAdslDmtLineConfProfileEntry 6 }
cAdslAtucDmtConfBitSwapEnabled OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies whether the ATU-C performs bitswapping.
Bitswapping attempts to maintain an acceptable margin for
each bin; equalizing the margin across all bins through bit
reallocation, thereby maximizing error performance.
The ATU-C performs bitswapping by monitoring the margin
measured for each bin by the transmitter:
1) If a bin's margin falls below 'target' and the difference,
between the margin and 'target' exceeds 'thresh(f)', then
the ATU-C marks the bin as a 'from' bin.
2) If a bin's margin exceeds 'target' and the difference
between the margin and 'target' exceeds 'thresh(t)', then
the ATU-C marks the bin as a 'to' bin.
Where: 'target' = adslAtucConfTargetSnrMgn
'thresh(f)' = cAdslAtucDmtConfBitSwapFrom
'thresh(t)' = cAdslAtucDmtConfBitSwapTo
The ATU-C attempts to equalize the margin across the bins by
swapping bits out of bins marked 'from' into bins marked 'to'.
When the ATU-C swaps a bit out of bin, it decreases its b(i).
Thus, the bins constellation is smaller, which increases its
margin. When the ATU-C swaps a bit into a bin, it increases
its b(i). Thus, the bins constellation is larger, which
decreases its margin.
In addition, the ATU-R may optionally implement its own
monitoring capability. The ATU-R uses this information to
request the ATU-C to perform bitswapping. When this object
is 'true', the ATU-C must be prepared to accept and properly
handle bitswap requests from the ATU-R.
While bitswapping has its obvious advantages, bitswapping can
have undesirable side effects. It can introduce errors on
lines prone to impulse noise. In this case, it may be desirable
to disable bitswapping."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces.
RFC 2662 - Definitions of Managed Objects for the ADSL Lines.
G. Bathrick,. Ly. August 1999. "
DEFVAL { true }
::= { cAdslDmtLineConfProfileEntry 7 }
cAdslAtucDmtConfBitSwapFrom OBJECT-TYPE
SYNTAX Integer32 (1..9)
UNITS "dB"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Bitswapping attempts to maintain an acceptable margin for
each bin; equalizing the margin across all bins through bit
reallocation, thereby maximizing error performance.
The ATU-C performs bitswapping by monitoring the margin
measured for each bin by the transmitter. If a bin's margin
falls below adslAtucConfTargetSnrMgn and the difference
between the margin and adslAtucConfTargetSnrMgn exceeds
the value of this object, then the ATU-C marks a bin as
a 'from' bin.
The ATU-C attempts to equalize the margin across the bins by
swapping bits out of bins marked 'from' into bins marked 'to'.
When the ATU-C swaps a bit out of bin, it decreases its b(i).
Thus, the bins constellation is smaller. which increases its
margin. When the ATU-C swaps a bit into a bin, it increases
its b(i). Thus, the bins constellation is larger, which
decreases its margin.
If this value is too small, then the ATU-C may frequently
toggle the bit allocation on bins, and if impulse noise is
present, this can cause errors. If this value is too large,
then the ATU-C may not identify an adequate number of bins
that it can swap bits 'from', thereby decreasing the chances
for the ATU-C to equalize the margin across all the bins.
Unequalized margin across all the bins translates into poor
error performance."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces.
RFC 2662 - Definitions of Managed Objects for the ADSL Lines.
G. Bathrick,. Ly. August 1999. "
DEFVAL { 3 }
::= { cAdslDmtLineConfProfileEntry 8 }
cAdslAtucDmtConfBitSwapTo OBJECT-TYPE
SYNTAX Integer32 (1..9)
UNITS "dB"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Bitswapping attempts to maintain an acceptable margin for
each bin; equalizing the margin across all bins through bit
reallocation, thereby maximizing error performance.
The ATU-C performs bitswapping by monitoring the margin
measured for each bin by the transmitter. If a bin's margin
exceeds adslAtucConfTargetSnrMgn and the difference between
the margin and adslAtucConfTargetSnrMgn exceeds the value of
this object, then the ATU-C marks a bin as a 'to' bin.
The ATU-C attempts to equalize the margin across the bins by
swapping bits out of bins marked 'from' into bins marked 'to'.
When the ATU-C swaps a bit out of bin, it decreases its b(i).
Thus, the bins constellation is smaller. which increases its
margin. When the ATU-C swaps a bit into a bin, it increases
its b(i). Thus, the bins constellation is larger, which
decreases its margin.
If this value is too small, then the ATU-C may frequently
toggle the bit allocation on bins, and if impulse noise is
present, this can cause errors. If this value is too large,
then the ATU-C may not identify an adequate number of bins
that it can swap bits 'to', thereby decreasing the chances
for the ATU-C to equalize the margin across all the bins.
Unequalized margin across all the bins translates into poor
error performance."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces.
RFC 2662 - Definitions of Managed Objects for the ADSL Lines.
G. Bathrick,. Ly. August 1999. "
DEFVAL { 3 }
::= { cAdslDmtLineConfProfileEntry 9 }
cAdslAturDmtConfFastFecSize OBJECT-TYPE
SYNTAX DmtFecSize
UNITS "bytes"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the initial number of FEC redundancy
bytes the ATU-R appends to upstream frames transmitted over
the fast channel during the training sequence. The ATU-C can
force the ATU-R to fallback from this value depending on the
aggregate data rate achieved during training.
It is desirable to choose a large FEC size, thereby increasing
the chance of being able to correct errors in the data delivered
by a frame. However, additional FEC redundancy bytes increases
frame overhead, and thus frame latency."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { 16 }
::= { cAdslDmtLineConfProfileEntry 10 }
cAdslAturDmtConfInterleaveFecSize OBJECT-TYPE
SYNTAX DmtFecSize
UNITS "bytes"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the initial number of FEC redundancy
bytes the ATU-R appends to upstream frames transmitted over
the interleaved channel during the training sequence. The
ATU-C can force the ATU-R to fallback from this value
depending on the aggregate data rate achieved during training.
It is desirable to choose a large FEC size, thereby increasing
the chance of being able to correct errors in the data delivered
by a frame. However, additional FEC redundancy bytes increases
frame overhead, and thus frame latency.
The value of this object must be a integral multiple of the
value of cAdslAturDmtConfCodewordSize."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { 16 }
::= { cAdslDmtLineConfProfileEntry 11 }
cAdslAturDmtConfCodewordSize OBJECT-TYPE
SYNTAX DmtCodewordSize
UNITS "symbols"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the number of symbols per codeword being
used by the ATU-R for upstream messages on an interleaved
channel during the training sequence. The ATU-C can force the
ATU-R to fallback from this value based on the aggregate data
rate achieved during training.
It is desirable to choose a large codeword size to minimize
overhead. However, increasing the codeword size increases the
possibility of not being able to correct errors in the data
delivered by a frame."
REFERENCE
"ANSI T1.413-1998 Issue 2, Network and Customer Installation
Interfaces - Asymmetric Digital Subscriber Line (ADSL)
Metallic Interfaces."
DEFVAL { 16 }
::= { cAdslDmtLineConfProfileEntry 12 }
cAdslAtucDmtConfMinrateBlock OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object is used to implement min-rate blocking on DMT
interfaces that support this option. "
DEFVAL { false }
::= { cAdslDmtLineConfProfileEntry 13 }
cAdslAtucDmtDualBitmapEnabled OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object is used to implement dual bitmap tables for
Annex C compliant DMT interfaces. The bin data for
the DSL interface will appear in cAdslAturDmtBinTable
and cAdslAtucDmtBinTable. "
DEFVAL { false }
::= { cAdslDmtLineConfProfileEntry 14 }
-- Alarm Configuration Profile Table
cAdslDmtLineAlarmConfProfileTable OBJECT-TYPE
SYNTAX SEQUENCE OF CAdslDmtLineAlarmConfProfileEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table extends the adslLineAlarmConfProfileTable and
contains enterprise-specific ADSL line configuration information
pertaining to alarms."
::= { ciscoAdslDmtLineMIBObjects 15 }
cAdslDmtLineAlarmConfProfileEntry OBJECT-TYPE
SYNTAX CAdslDmtLineAlarmConfProfileEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A configuration profile containing enterprise-specific ADSL
line configuration information pertaining to alarms"
INDEX { IMPLIED adslLineAlarmConfProfileName }
::= { cAdslDmtLineAlarmConfProfileTable 1 }
CAdslDmtLineAlarmConfProfileEntry ::= SEQUENCE {
cAdslAtucDmtThreshRateFallback Integer32,
cAdslAturDmtThreshRateFallback Integer32
}
cAdslAtucDmtThreshRateFallback OBJECT-TYPE