Northern Telecom BCS35 Replacement Manual page 108

92 DSI circuit pack
Table 10–4
Data stream interface (DSI) circuit packs (A13 and B13) options – part number: NT6M70AC
Device type
(number)
Strap x = strap to center post
A B C D E F G H
X
X
X X
X X
U42 EPROM SIZE
2
U41 RAM SIZE
2
U52 RAM SIZE
DIP (X = On)
Switch 1 2 3 4 5 6 7 8
(S1) 1 and 2 Off
X
X
X X
X
297-1001-536 Standard 01.03 August 1996
Position/setting
X
X
X X
X
X
X
X
2764
2732A
27128
27256
27512
8K x 8
32K x 8
8K x 8
32K x 8
9
X
X
X
X
X
X
Function
U42 and U41
Chip type; strap to use
with:
2732A U42
2764 U42
27128 U42
27256 U42
27512 U42
8K x 8 RAM2 U52
32K x 8 RAM2 U52
Straps: B, D
Straps: F
Straps: B, E, D
Straps: B, E, C
Straps: A, E, C
SW1 position: 8
9
SW1 position: 9
8
Straps: G
Straps: H
Select:
DSI1
DSI2
DSI3
DSI4
32K x 8 RAM1 U41
8K x 8 RAM1 U41
12.5 ips
25/37.5 ips
45 ips
0.4 to 0.8 MS
0.8 to 1.6 MS
ms = microsecond
— continued —
Setting
Factory On–site
B, D Must be the
same as
the factory
setting.
3
3
G
In (Typical)
In
In
In
In
On (Typical)
Off
On (Alternate RAM)
Off
In (Typical)
In
@S1 Must be the
same as
3 = On the factory
7 = On setting.
8 = On
1 = Off
3
2 = Off
3
4 = Off
5 = Off
6 = Off
9 = Off
Note:
PIN 1 is
shown as
white dot
on PCB.
1=A,D,G