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A MIB (Management Information Base) is a structured document that defines the data a device exposes over SNMP — things like interface counters, system uptime, or CPU load. Each module declares a set of named objects, organized into a tree.

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An OID (Object Identifier) is the numeric address of one piece of data in a MIB — a dotted sequence like 1.3.6.1.2.1.1.1, read from the root of a global tree down to one specific object. Names are easier to read; OIDs are what's actually sent over the wire.

Try it: sysDescr (1.3.6.1.2.1.1.1) →

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iso/org/dod/internet/private/enterprises/.351/.110/basisLines/dsx1/dsx1Line/.1/dsx1CnfGrpTable/dsx1CnfGrpEntry/lineLength

lineLength

OBJECT-TYPE

1.3.6.1.4.1.351.110.4.3.1.1.1.1.6

Access

read-write

Status

current

Source

CISCO-MGX82XX-DSX1-MIB

Sub-identifiers

Description

This is not a standard RFC 1407 DS1 variable, it is specific to BASIS implementation. It specifies the line length: 1 - 0 to 110 ft (T1 line only) 2 - 110 to 220 ft (T1 line only) 3 - 220 to 330 ft (T1 line only) 4 - 330 to 440 ft (T1 line only) 5 - 440 to 550 ft (T1 line only) 6 - 550 to 660 ft (T1 line only) 7 - greater than 660 ft (T1 line only) 8 - 75 ohms (E1 line only (BNC)) 9 - 120 ohms (E1 line only (DB-15)) The default value for T1 is 1, for E1, if the connector type is DB15 then the default is 9, if BNC, it's 8. For FRSM-2CT3, the line length of DS1 has no meaning as there are no physical DS1 lines. So, for this card, the value is set to notRequired (16).

Syntax

INTEGER { lineLength0To110Feet (1), lineLength110To220Feet (2), lineLength220To330Feet (3), lineLength330To440Feet (4), lineLength440To550Feet (5), lineLength550To660Feet (6), lineLength660FeetPlus (7), lineLength-75-Ohm (8), lineLength-120-Ohm (9), lineLength0To131Feet (10), lineLength131To262Feet (11), lineLength262To393Feet (12), lineLength393To524Feet (13), lineLength524To655Feet (14), lineLength655FeetPlus (15), notRequired (16) }