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COMSPHERE DualFlow Data Service Units
3-10 December 1996 3615-A2-GB20-20
Addressing the Unit
A
unique address must be assigned to each control and
tributary DSU in your network. Y
ou can assign an address
within the range of 1 through 255.
NOTE
Do not assign the number 192
as a network address. This
number is reserved as a
broadcast address.
The
DBM requires a separate address, which is
automatically assigned by the DSU. The address assigned
a DBM is the DSU’
s address, plus 1 (e.g., if the DSU’s
address is 1, the assigned DBM address will be 2).
NOTE
The numbers 191 and 255
cannot be assigned to a DSU
that has a DBM. However,
addresses can be assigned in
any order; they do not have to
be sequential.
It is recommended that only
odd-numbered addresses
be
assigned to DSUs so that
even-numbered addresses
are
reserved for DBMs.
Tributary DSU Addressing
Tributary
DSU addresses are user
-definable. The
control DSU accesses its tributary via an active backup
connection by specifying the tributary’
s address.
The 6700 or 6800 Series NMS accesses the DSU via its
network address.
T
o access a tributary DSU,
the NMS
first addresses the control, then the tributary
. An address
issued from the NMS takes the format of control
channel/control DBM network address/tributary network
address. This is called link-level network addr
essing.
Figure 3-5 shows an example
of DSU and DBM
addressing, as well as link-level network addressing.
Refer to Chapter 4 to learn how to set the DSU’s
network address.
Figure 3-5. Addressing Example