SNMP MIB Objects
E-133160-A2-GB21-50 January 1997
General Port Table – “rs232PortType” Object
(rs232PortEntry 2)
This object is used to identify the port’s hardware type.
Only the following values are supported by the
DSU/CSU.
•rs232(2) – Used to identify the MODEM, AUX,
and COM ports.
•rs422(3) – Used to identify synchronous data ports
that are configured as EIA-530A or RS-449.
•V35(5) – Used to identify synchronous data ports
that are configured as V.35.
General Port Table – “rs232PortInSigNumber”
Object (rs232PortEntry 3)
This object contains the number of input signals
contained in the input signal table. This is the number of
signals that can be detected. This number is 2 for the
synchronous data ports and 0 for the MODEM, AUX, and
COM ports.
General Port Table – “rs232PortOutSigNumber”
Object (rs232PortEntry 4)
This object contains the number of output signals
contained in the output signal table. This is the number of
signals that can be asserted. This number is 2 for the
synchronous data ports and 0 for the MODEM, AUX,
and COM ports.
General Port Table – “rs232PortInSpeed”
Object (rs232PortEntry 5)
This object contains the port’s input speed in bits per
second. For the DSU/CSU, the rs232PortInSpeed object
has the same value as the rs232PortOutSpeed object. The
input speed of a synchronous data port is determined by
the channel configuration and cannot be changed through
this object. Thus, for the synchronous data ports, this
object is read-only. The input speed of the MODEM,
AUX, or COM port is the currently configured speed.
Setting of this value for the MODEM, AUX, or COM port
causes the configured port speed to be changed.
General Port Table – “rs232PortOutSpeed”
Object (rs232PortEntry 6)
This object contains the port’s output speed in bits per
second. For the DSU/CSU, the rs232PortInSpeed object
has the same value as the rs232PortOutSpeed object. The
input speed of a synchronous data port is determined by
the channel configuration and cannot be changed through
this object. Thus, for the synchronous data ports, this
object is read-only. The input speed of the MODEM,
AUX, or COM port is the currently configured speed.
Setting of this value for the MODEM, AUX, or COM port
causes the configured port speed to be changed.
Asynchronous Port Table, RS-232-like MIB
The asynchronous port table contains an entry for the
MODEM, AUX, or COM port when the port is configured
for asynchronous operation. For the DSU/CSU, the entries
in the table that are counters (rs232AsyncPortEntry 6–8)
are used to collect statistics and are not supported.
Asynchronous Port Table, “rs232AsyncPortBits”
(rs232AsyncPortEntry 2)
This object specifies the number of bits in a character.
Only the following values are supported by the
DSU/CSU.
•7 – 7-bit characters. Supported on the COM and
MODEM ports only.
•8 – 8-bit characters.
Asynchronous Port Table,
“rs232AsyncPortStopBits”
(rs232AsyncPortEntry 3)
This object specifies the number of stop bits supported.
Only the following values are supported by the
DSU/CSU.
•one(1) – One stop bit.
•two(2) – Two stop bits. Supported on the COM and
MODEM ports only.
•one-and-half(3) – One and a half stop bits.
Supported on the COM port only.