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10.4.5 Preamplifier Strapping
Preamplifier Basic Jumpers
• p •
N
N
• P •
• L •
M
M
• L •
•
J
• H •
K •
• F • G.
• p .
• L •
N
N
M
M
• G • F.
• P.
• L •
• A •
• E •
Location Q2
A - Jumper required for switched network
(-40 db) or leased network with SNBU;
jumper removed for leased network
without SNBU (-27 db) and for French
CADUCE E networks
B - Jumper required for 4-wire without
SNBU; jumper removed for 2-wire or
SNBU.
C
Not used.
o
Required.
E
Required.
F
Required for 2-wire (two locations).
G
Required for 4-wire (two locations).
Note:
Refer to the schematic on this page
for an explanation of jumpers F and G.
• B •
Attenuation from 0 db (H, J, K - one loca-
tion each; L,
M,
N,
P -
four locations each)
o
M, P
H, M, P
2
J, M, P
3
K, M, P
4
L, P
5
H, L, P
6
J, L, P
7
K, L, P
8
M, N
9
H, M, N
10- J, M, N
11 - K, M, N
12- L, N
13- H, L, N
14- J, L, N
15- K, L, N
Note:
Transmit level is jumpered for 0 db
for leased (dedicated) lines in the U.S. and
Canada; it is jumpered for -6 db for French
CADUCEE lines.
t--
1 - _ - - - - - - - - - - - - - - ( G 1 0 )
+
Transmit Line
From Transmitter Logic \
J--i--~_-----------
(J13) - Transmit Line
()
F
~o_---t------------(G12)
- Receive Line
G
- Receive Line (G13)-----0
4W
()
F
O~----------(J12)
+
Receive Line
G
+
Receive Line (J11 ) - - - - - - - - 0
4W
Data Communications
10-23
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