COMSPHERE 3600 Series Data Service Units
D-2
December 1996
3610-A2-GB46-60
LPDA-2 Addressing
The addressing scheme for LPDA-2 establishes a
relationship between the link segments (primary circuit
and extended circuit) and the remote DSUs populating
the circuit. It allows you to target a link segment or a
particular control-tributary DSU pair in the circuit for
diagnostic testing.
The LPDA-2 address is independent of the DSU
network address associated with an NMS or front panel
command, although you may choose to assign the same
value to each.
The following rules apply to assigning the LPDA-2
address to control DSUs (Figure D-1):
•
Link Segment Level 1. The control DSU closest
to the NetView host is the first level control and
assigned the address 1.
•
Link Segment Level 2. An extended control DSU,
is the second level control and assigned the
address 2.
•
Valid Addresses. Valid addresses for control
DSUs range from 1 to 255.
The following rules apply to assigning the LPDA-2
address for tributary DSUs:
•
Valid Addresses. Valid addresses for tributary
DSUs range from 1 to 255.
•
Single DTE. The tributary DSU address is set to
the physical unit address of the attached terminal
device; this is a NetView constraint.
•
Extended Circuit. For configurations having
extended circuits, the backbone tributary DSU in
the primary circuit must be set to 253 and
configured as a point-to-point circuit. Address 253
(FD hex) is the broadcast LPDA-2 address.
496-12986b-04
CPE
Netview
Host
NMS
* LPDA-2 Address
Tributary
DSU
Extended
Control DSU
Tributary
DSU
253*
4*
Link Segment Level 1
(Primary Circuit)
Link Segment Level 2
(Extended Circuit)
Control DSU
FEP
CARRIER
SDU
DSU
1*
2*
LPDA-2 Control
Crossover
Cable
CPE = Customer Provided Equipment
Figure D-1. LPDA-2 Addressing Example
