2
The NCC-1F also provides IRQs 5, 7, 9, 10, 11,
12, 14, and 15. These can be used in conjunction
with COM 3 and COM 4 if IRQs 3 and 4 are used
by other hardware. When using these IRQs be
sure that no other hardware has been assigned
to the IRQ used on the NCC-1F.
INSTALLATION
Remove all NCC-G power before installation.
To install the NCC-1F follow the steps listed below:
1. Unscrew the two knurled knobs on the rear of
the NCC-G computer.
2. Slide the cover back an inch or so and lift it off.
3. The NCC-1F installs into any free 16-Bit
ISA slot in the NCC-G computer. Select a slot
and remove the blank cover, keeping
the screw.
4. Remove the terminal block from the NCC-1F
by removing the two screws that hold it to the
bracket.
5. Place the NCC-1F into the open slot so that
the NCC-1F card edge extends through the
opening in the back of the PC.
6. Align the NCC-1F with the card edge
connector in the NCC-G computer and
press it firmly into place.
7. Secure the NCC-1F by installing the screw
that held the blank cover. (Refer to Step 3.)
8. Replace the NCC-G computer cover and
tighten the knurled knobs.
9. Reattach the terminal block by sliding it
onto the NCC-1F card edge and install the
two screws. This is a keyed connection
and will only install one way.
ELECTRICAL CONNECTIONS
Network (XNET)
The XNET connections are made on terminals
1-4 of the terminal block on the rear of the
NCC-1F. The primary pair (or network A) is
on terminals 1 and 2. The secondary pair (or
network B) is on terminals 3 and 4.
For Style 4
networks,
install a 120 ohm EOLR
on terminals 3 and 4. See Figure 2 for wiring
details.
For Style 7 networks,
connect to both the
primary and secondary pairs. See Figure 2 for
wiring details.
Figure 2
NCC-1F XNET Connections
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SEE NOTE 7
DO NOT USE
DO NOT USE
DO NOT USE
DO NOT USE
ONE SLOT OF CC-5
NIC-C
1
2
3
4
5
6
PAIR A
SUPERVISED
POWER LIMITED
PAIR B
(OMIT FOR STYLE 4)
SUPERVISED
POWER LIMITED
LOCATED INSIDE NCC
NOTE:
IF THE NCC IS LOCATED
AT THE END OF THE XNET
NETWORK, INSTALL EOLR
P/N 140-820350 ACROSS
TERMINALS 1 & 2 AND 3 & 4.
NCC-1F
MOM-4
TB3 OR TB4
NIM-1R / NIM-1W
1
2
3
4
TO ADDITIONAL
NIM-1Rs, NIM-1Ws,
NCC-1Fs OR NIC-Cs
NOTES:
1. No EOLR required for NIC-C.
2. 18 AWG min., 12 AWG max.
3. 80 Ohms max. per pair.
Unshielded twisted pair - .5μF line to line
Shielded twisted pair - .3μF line to line, .4μF line to
shield
4. Use twisted pair or twisted shielded pair.
5. Terminate shields at one end only.
6. Power limited to NFPA 70 per NEC 760.
7. CC-5 terminals 9 - 14 are not connected and can be
used to tie shields together.
8. Maximum voltage 8V P-P.
9. Each pair independently supervised.
Refer to Wiring Specification for MXL, MXL-IQ
and MXLV Systems, P/N 315-092772 revision
6 or higher, for additional wiring information.