AT&T 3551 Switch User Manual


 
COMSPHERE 3550 Series Data Service Units
2-8 February 1995 3550-A2-GB20-10
Table 2-2
LADS Connection Distances
Data Rate
Wire Gauge (AWG)
Data Rate
(kbps)
19 22 24 26
2.4 20.0 mi
(32.2 km)
16.6 mi
(26.7 km)
12.7 mi
(20.5 km)
9.4 mi
(15.1 km)
4.8 19.4 mi
(31.2 km)
12.7 mi
(20.5 km)
9.6 mi
(15.4 km)
7.1 mi
(11.5 km)
9.6 15.2 mi
(24.5 km)
9.7 mi
(15.6 km)
7.3 mi
(11.7 km)
5.6 mi
(9.0 km)
19.2
1
11.8 mi
(19.0 km)
7.5 mi
(12.1 km)
5.7 mi
(9.2 km)
4.2 mi
(6.8 km)
38.4 11.2 mi
(18.0 km)
6.5 mi
(10.5 km)
4.6 mi
(7.4 km)
3.2 mi
(5.1 km)
56 9.2 mi
(14.8 km)
5.4 mi
(8.7 km)
3.8 mi
6.2 km)
2.8 mi
(4.5 km)
64 9.2 mi
(14.8 km)
5.4 mi
(8.7 km)
3.8 mi
(6.2 km)
2.8 mi
4.5 km)
1
Power level is –10 dBm.
Addressing the Unit
A unique address must be assigned to each control and
tributary DSU in your network. You 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.
If a DBM is installed, it 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
.
If your network does not currently
include DBMs, you retain the
flexibility to add them later without
having to reconfigure your entire
network.