IBM 3274 51C Maintenance Information page 166

OJ
I I I I I
R1
(sealed)
8 8
Sw Sw
1 2
Position 1
PN 8564509
Sw
Position ' "
N-Sw SNBU-AA
Description
2-Wire 4-Wire
8
- -
Not used
7
-
On
CS delay
6
-
On CS delay
5
-
-
Card Test
Sw 1
4
-
On
Echo clamp
3
-
On 4-wire
2 On
-
2-wire
1
- -
Xmit level
-low
8
- -
OdBm 1
-1 dBm 2
7
-
-
-2 dBm 3
-3 dBm 4
;:-
6
- -
-4 dBm 5
C1l
...
-5 dBm 6
0
~
5
- -
-6
dBm 1,7
a;
>
-7 dBm 2,7
!I!
...
Sw2
4 -8
dBm 3,7
' E
- -
II)
-9 dBm 4,7
c:
~ ...
3
- -
-10 dBm 5,7
C1l
.:
-11 dBm 6,7
3:
2
-
-12 dBm 1,8
VJ
-
-13 dBm 2,8
1
On
On
-14 dBm 3,8
(Note 3)
(Note 3)
-15 dBm 4,8
OdBm
OdBm R 1 (Potentiometer)
Nonswitched line
xmit level
(Note 2)
Notes:
1. Switched line transmit level switches (S2) are factory-
preset to 0 dBm (1 on).
2. Nonswitched line transmit level (RT) is factory-preset
to OdBm.
3. "On" indicates switch-on position; al/ others
are off.
Figure C-2. 1200-bps Integrated Modem Card (No. 14), N-Sw and N-Sw-SNBU-AA, U.S. and Canada
Appendix C. Connector, Board, and Card Locations C-3