Installation
2-5
GDC 048R154-000
Table 2-1
Option Application Notes — Switchbank S13, CSU
Characteristics (Continued)
Option
Selection
Switch
Position
Description
DS-1 Line
Build-Out (LBO)/
DSX-1
Pre-equalization
LBO
S13-5
S13-6
S13-7
S13-8
All Off* =
0 dB
S13-5 On =
-7.5 dB
S13-6 On =
-15 dB
S13-7 On =
-22.5 dB
S13-8 On =
Auto LBO
These switches control LBO when
a DS-1 line interface is selected at
S13-4. Set all Off for 0 dB manual
LBO. Set 5, 6, or 7 On for the spec-
ified manual LBO. Set 8 On for au-
tomatic LBO. Set only one switch
On.
Caution:
Do not enable automatic LBO for
both DSUs in a pair connected
back-to-back. Do not enable auto-
matic LBO when the DSU is con-
nected to a DS1 Interface
Connector (Smart Jack): use man-
ual LBO with 0 dB attenuation.
Pre-
equalization
S13-5
S13-6
S13-7
S13-8
All Off* =
0-133 ft
S13-5 On =
133 -266 ft
S13-6 On =
266 -399 ft
S13-7 On =
399 -533 ft
S13-8 On =
533 -655 ft
These switches control Pre-equal-
ization when a DSX-1 line inter-
face is selected at S13-4.
Pre-equalization matches transmit-
ter to network gain characteristics
for DSX-1. Select the lowest value
that equals or exceeds the distance
between units.
* Factory default selection.