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ACCULINK 316x DSU/CSU
E-12 January 1997 3160-A2-GB21-50
Operational Note: The fractional T1 group only allows
specification of an entire interface to a particular time slot
on another interface (i.e., a time slot on one interface
cannot be mapped to a time slot on another interface).
This prevents complete mapping of time slots on the DTE
Drop/Insert (DSX-1) interface to time slots on the
network interface. For mapping time slots between the
network and DTE T1 interfaces, the following convention
is used: Time slots on the T1 interface that are mapped to
another T1 interface (i.e., not a data port) are connected in
ascending order. For example, if the fractional table for
the network interface maps time slots 1, 3 and 5 to the
DTE T1 interface and the DTE T1 interface maps time
slots 10, 11 and 15 to the network the following time slots
will be connected: N1 to D10, N3 to D11 and N5 to D15.
RS-232-like MIB (RFC 1317)
The “rs232” object defined by RFC 1317 is supported
for all of the synchronous data ports, the MODEM port,
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
DSU/CSU for the synchronous data ports. The Input
Signal and Output Signal tables are not supported for the
MODEM, 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 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 5 for the
3160, 7 for the 3164, 3 for the 3165 and 2 for the 3161.
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 3160 DSU/CSU
are:
• 1 – COM port
• 2 – Modem port
• 3 – Auxiliary RS-232 port
• 4 – DCE port 1
• 5 – DCE port 2
The values of rs232PortIndex for the 3164 DSU/CSU
are:
• 1 – COM port
• 2 – Modem port
• 3 – Auxiliary RS-232 port
• 4 – DCE port 1
• 5 – DCE port 2
• 6 – DCE port 3
• 7 – DCE port 4
The values of rs232PortIndex for the 3165 DSU/CSU
are:
• 1 – COM port
• 2 – Modem port
• 3 – DCE port 1
The values of rs232PortIndex for the carrier 3161
DSU/CSU are:
• 1 – DCE port 1
• 2 – DCE port 2 or COM port (depending upon
configuration)