Network Device User's Guide

SNMP MIB Objects
E-15
3166-A2-GB20-10
November 1998
DS1 Fractional Group, DS1/E1 MIB
The DS1 Fractional Group consists of the DS1 fractional table. This table
(dsx1FracTable) is fully supported by the DSU/CSU and allows channel (time
slots) to be mapped between the T1 interface and data port.
RS-232-like MIB (RFC 1317)
The “rs232” object defined by RFC 1317 is supported for the synchronous data
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 DSU/CSU for the
synchronous data port. 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 DSU/CSU.
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 1 for the Model 3166.
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 value of rs232PortIndex for the Model 3166 DSU/CSU is:
 1 – DCE port 1