RS-232-Like MIB Group
The RS-232-like MIB group {mib-2 transmission} applies to interface ports, such
as an RS-232 port with modem signals, that logically support the Interface MIB,
Transmission MIB, or Character MIB.
The DECagent 90 supports the RS-232-like MIB for the DECserver 90L and the
DECserver 90L+ modules.
The RS-232-like MIB is a one of a set of MIBs designed for complementary use.
The set comprises:
•
Character MIB
•
PPP MIB
•
RS-232-like MIB
•
Parallel-printer-like MIB
The RS-232-like MIB and the Parallel-printer-like MIB represent the physical
layer, providing service to higher layers such as the Character MIB or PPP MIB.
Further MIBs may appear above these.
The intent of the model is for the physical-level MIBs to represent the lowest
level, regardless of the higher level that may be using it. In turn, separate higher
level MIBs represent specific applications, such as a terminal (the Character
MIB) or a network connection (the PPP MIB).
The RS-232-like MIB is mandatory for all systems that have a hardware port
that supports services managed through some other MIB, such as, the Character
MIB or PPP MIB.
The MIB includes multiple similar types of hardware, and as a result contains
objects not applicable to all of those types. Such objects are in a separate branch
of the MIB, which is required when applicable and otherwise absent.
The RS-232-like MIB includes RS-232, RS-422, RS-423, V.35, and other
asynchronous or synchronous, serial physical links with a similar set of control
signals.
The MIB contains objects that relate to physical layer connections. Such
connections provide hardware signals (other than for basic data transfer),
such as RNG and DCD. Hardware ports also have such attributes as speed and
bits per character.
Usefulness of the error counters in this MIB depends on the presence of non-error
character counts in higher level MIBs.
C–4 MIB Groups and Communities
Содержание DECagent 90
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