📄 rfc1232.txt
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Transmission MIB Working Group [Page 7]
RFC 1232 DS1 Interface Objects May 1991
ds1CircuitIdentifier
DisplayString (SIZE (0..255))
}
ds1CSUIndex OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The index value which uniquely identifies the CSU
to which this entry is applicable."
::= { ds1ConfigEntry 1 }
ds1Index OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index value that uniquely identifies an
interface to a ds1. The interface identified by a
particular value of this index is the same
interface as identified by the same value an
ifIndex object instance."
::= { ds1ConfigEntry 2 }
ds1TimeElapsed OBJECT-TYPE
SYNTAX INTEGER (1..900)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of seconds that have elapsed since the
beginning of the current error-measurement period.
Any fraction is rounded up."
::= { ds1ConfigEntry 3 }
ds1ValidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of previous intervals for which valid
data was collected. The value will be 96 unless
the CSU device was brought online within the last
24 hours, in which case the value will be the
number of complete 15 minute intervals the CSU has
been online."
::= { ds1ConfigEntry 4 }
Transmission MIB Working Group [Page 8]
RFC 1232 DS1 Interface Objects May 1991
ds1LineType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
ds1ESF(2),
ds1D4(3),
ds1ANSI-ESF(4),
ds1G704(5),
ds1G704-CRC(6)
}
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This variable indicates the variety of DS1 Line
implementing this circuit. The type of circuit
affects the number of bits per second that the
circuit can reasonably carry, as well as the
interpretation of the usage and error statistics.
The values, in sequence, describe:
TITLE: SPECIFICATION:
ds1ESF AT&T Extended SuperFrame DS1 [10]
ds1D4 AT&T D4 format DS1 [16], [17]
ds1ANSI-ESF ANSI Extended SuperFrame format [14]
ds1G704 CCITT Recommendation G.704 [12]
(section 2.1.3.2)
ds1G704-CRC CCITT Recommendation G.704 [12]
(section 2.1.3.1)
"
::= { ds1ConfigEntry 5 }
ds1ZeroCoding OBJECT-TYPE
SYNTAX INTEGER {
ds1JammedBit(1),
ds1B8ZS(2),
ds1InvertedHDLC(3),
ds1HDB3(4),
ds1ZBTSI(5)
}
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This variable describes the variety of Zero Code
Suppression used on the link, which in turn
affects a number of its characteristics.
ds1JammedBit refers the Jammed bit Zero Encoding,
in which the AT&T specification of at least one
pulse every 8 bit periods is literally implemented
Transmission MIB Working Group [Page 9]
RFC 1232 DS1 Interface Objects May 1991
by forcing a pulse in bit 8 of each channel.
Thus, only seven bits per channel, or 1.344 Mbps,
is available for data.
ds1B8ZS refers to the use of a specified pattern
of normal bits and bipolar violations which are
used to replace a sequence of eight zero bits (see
[14]). In this context, all eight bits in a
channel are technically available for data, but
care must be taken with D4 encoded data to avoid
having HDLC Flag streams imitate spurious Yellow
Alarm conditions. Typically, one bit per frame is
ignored to force flag streams to rotate, thereby
avoiding this error type. CCITT Recommendation
G.703 [11] may be referred to for further
definition of these.
ds1InvertedHDLC refers to the practice, common on
HDLC encoded DS1 data links, of inverting the data
between the serial interface chip and the CSU.
Since HDLC guarantees one zero every 6 bits in the
worst case, while the standards call for (in
effect) at least one pulse every eight, inverted
HDLC enjoys 4/24 one's density on the line, which
may improve the effective clock stability of a DS1
line. As with B8ZS, all eight bits in a channel
are technically available for data, but care must
be taken with D4 encoded data to avoid having HDLC
Flag streams imitate spurious Yellow Alarm
conditions. Typically, one bit per frame is
ignored to force flag streams to rotate, thereby
avoiding this error type.
ANSI Clear Channels may use ds1ZBTSI, or Zero Byte
Time Slot Interchange (see [14]).
G.704 links, with or without CRC, use ds1HDB3 (see
[11]). "
::= { ds1ConfigEntry 6 }
ds1Loopback OBJECT-TYPE
SYNTAX INTEGER {
ds1NoLoop(1),
ds1LocalLoopbackLocalSide(2),
ds1LocalLoopbackRemoteSide(3),
ds1RemoteLoopbackLocalSide(4),
ds1RemoteLoopbackRemoteSide(5)
}
Transmission MIB Working Group [Page 10]
RFC 1232 DS1 Interface Objects May 1991
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This variable represents the loopback state of
the CSU. Devices supporting read/write access
should return badValue in response to a requested
loopback state that the CSU does not support. The
values mean:
ds1NoLoop
Not in the loopback state. A device that is
not capable of performing a loopback on either
interface shall always return this as it's
value.
ds1LocalLoopbackLocalSide
Signal received from the local side of the
device is looped back at the local connector
(eg, without involving the CSU).
ds1LocalLoopbackRemoteSide
Signal received from the local side of the
device is looped back at the remote connector
(eg, through the CSU).
ds1RemoteLoopbackLocalSide
Signal received from the remote side of the
device is looped back at the local connector
(eg, through the CSU).
ds1RemoteLoopbackRemoteSide
Signal received from the remote side of the
device is looped back at the remote connector
(eg, without involving the CSU)."
::= { ds1ConfigEntry 7 }
ds1SendCode OBJECT-TYPE
SYNTAX INTEGER {
ds1OtherTest(1),
ds1SendNoCode(2),
ds1SendSetCode(3),
ds1SendResetCode(4),
ds1SendQRSS(5)
Transmission MIB Working Group [Page 11]
RFC 1232 DS1 Interface Objects May 1991
}
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This variable indicates what type of code is
being sent across the DS1 circuit by the CSU. The
values mean:
ds1SendNoCode sending looped or normal data
ds1SendSetCode sending a loopback request
ds1SendResetCode sending a loopback termination request
ds1SendQRSS sending the BERT pattern described in
ANSI T1.403-1989 section 5.6
ds1OtherTest sending a different BERT/BLERT pattern,
such as all zeroes, all ones, etc."
::= { ds1ConfigEntry 8 }
ds1YellowAlarm OBJECT-TYPE
SYNTAX INTEGER {
ds1NoYellowAlarm (1),
ds1YellowAlarm (2)
}
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This variable indicates if a Yellow Alarm
condition exists.
Note that G.704 interfaces do not support Yellow
Alarms. Accordingly, such agents should return
the value ds1NoYellowAlarm."
::= { ds1ConfigEntry 9 }
ds1RedAlarm OBJECT-TYPE
SYNTAX INTEGER {
ds1NoRedAlarm (1),
ds1RedAlarm (2)
}
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This variable indicates if a Red Alarm condition
exists.
Note that G.704 interfaces do not support Red
Alarms. Accordingly, such agents should return
the value ds1NoRedAlarm."
::= { ds1ConfigEntry 10 }
Transmission MIB Working Group [Page 12]
RFC 1232 DS1 Interface Objects May 1991
ds1CircuitIdentifier OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This variable contains the transmission vendor's
circuit identifier, for the purpose of
facilitating troubleshooting."
::= { ds1ConfigEntry 11 }
-- the DS1 Interval group
-- Implementation of this group is mandatory for all systems
-- that attach to a ds1.
-- It is recognized that some currently deployed CSUs do not
-- record the entire set of statistics specified in this
-- group. Accordingly, some agents queried for these objects
-- may treat these objects as having an ACCESS clause value
-- of not-accessible.
-- The DS1 Interval Table contains various statistics
-- collected by each CSU over the previous 24 hours of
-- operation. The past 24 hours are broken into 96 completed
-- 15 minute intervals.
ds1IntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF DS1IntervalEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"The DS1 Interval table."
::= { ds1 2 }
ds1IntervalEntry OBJECT-TYPE
SYNTAX DS1IntervalEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"An entry in the DS1 Interval table."
INDEX { ds1IntervalIndex, ds1IntervalNumber }
::= { ds1IntervalTable 1 }
DS1IntervalEntry ::=
SEQUENCE {
ds1IntervalIndex
INTEGER,
Transmission MIB Working Group [Page 13]
RFC 1232 DS1 Interface Objects May 1991
ds1IntervalNumber
INTEGER (1..96),
ds1IntervalESs
Counter,
ds1IntervalSESs
Counter,
ds1IntervalSEFSs
Counter,
ds1IntervalUASs
Counter,
ds1IntervalCSSs
Counter,
ds1IntervalBPVs
Counter,
ds1IntervalCVs
Counter
}
ds1IntervalIndex OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The index value which uniquely identifies the CSU
to which this entry is applicable. The interface
identified by a particular value of this index is
the same interface as identified by the same value
an ds1CSUIndex object instance."
::= { ds1IntervalEntry 1 }
ds1IntervalNumber OBJECT-TYPE
SYNTAX INTEGER (1..96)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"A number between 1 and 96, where 1 is the most
recently completed 15 minute interval and 96 is
the least recently completed 15 minute interval
(assuming that all 96 intervals are valid)."
::= { ds1IntervalEntry 2 }
ds1IntervalESs OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The counter associated with the number of Errored
Seconds, as defined by ANSI Draft Standard
Transmission MIB Working Group [Page 14]
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