SNMP MIB Objects
E-11
3360-A2-GB20-10
June 1996
network channels (e.g., D1 to N1, etc.), otherwise an error
is returned to the SNMP manager.
When time-slot 16 is using Channel-Associated
Signaling (CAS), allocated DTE channels can be mapped
to any other corresponding network channels (e.g., D1 to
N3, D5 to N7, etc.).
RS-232-like MIB (RFC 1317)
The “rs232” object defined by RFC 1317 is supported
for all of the synchronous data ports, the COM port, and
the AUX port. The RS-232-like MIB consists of one
object and five tables, as follows:
•
Number of RS-232-like ports
•
The General Port Table
•
The Asynchronous Port Table
•
The Synchronous Port Table
•
The Input Signal Table
•
The Output Signal Table
The Asynchronous Port table is not supported by the
E1 NTU for the synchronous data ports. The Input Signal
and Output Signal tables are not supported for the AUX
and COM ports. The following sections provide
clarification for objects contained in the RS-232-like MIB
when it is not clear how the object definition in MIB is
related to the E1 NTU.
Number of Ports – “rs232Number” Object
(rs232 1)
This object contains the number of ports in the
RS-232-like general port table. This number is 3 for the
3365 NTU, 4 for the 3360 NTU, and 6 for the 3364 NTU.
General Port Table, RS-232-like MIB
The general port table contains general configuration
objects for the RS-232-like interfaces.
General Port Table – “rs232PortIndex” Object
(rs232PortEntry 1)
This object contains a unique value for each port and is
used as an index into the general port table
(rs232PortTable). The values of the rs232PortIndex object
vary between models and are listed below.
The values of rs232PortIndex for the 3360 NTU are:
•
1 – COM port
•
2 – Auxiliary RS-232 port
•
3 – DCE port 1
•
4 – DCE port 2
The values of rs232PortIndex for the 3364 NTU are:
•
1 – COM port
•
2 – Auxiliary RS-232 port
•
3 – DCE port 1
•
4 – DCE port 2
•
5 – DCE port 3
•
6 – DCE port 4
The values of rs232PortIndex for the 3365 NTU are:
•
1 – COM port
•
2 – Auxiliary RS-232 port
•
3 – DCE port 1
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 E1 NTU.
•
other(1) – Used to identify synchronous data ports
that are configured as X.21.
•
rs232(2) – Used to identify the 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 AUX and COM
ports.
