Hughes Network Systems PICO-1900 User Manual
1026209 – 0001 Revision B
2–14 Adding cards to the System Controller
A Quad T1 card is factory installed in slot 9. When only one Quad
T1 card is installed (or if the card is replaced), set all S1 switches
to ON (terminated). This is the default setting.
T1 card is installed (or if the card is replaced), set all S1 switches
to ON (terminated). This is the default setting.
If you add a Quad T1 card (in slots 4 through 8), the setting for
switch S1 depends on where the card is on the H.100 bus:
switch S1 depends on where the card is on the H.100 bus:
•
If the Quad T1 card is the first or last Quad T1 card on the
H.100 bus, set all S1 switches to ON (H.100 bus
terminated).
H.100 bus, set all S1 switches to ON (H.100 bus
terminated).
•
For cards that are not first or last on the H.100 bus, set all
S1 switches to OFF (unterminated). See Figure 2-10.
S1 switches to OFF (unterminated). See Figure 2-10.
Termination reduces line noise caused by signal reflection off the
two ends of the bus, and is critical for correct transmission of
referenced T1 clock signals.
two ends of the bus, and is critical for correct transmission of
referenced T1 clock signals.
Switches S2 through S5 are factory configured with the following
default settings: Sx–1 and Sx–5 ON, and all others OFF. Do not
change these settings. Switches S2 through S5 may be covered
with an adhesive label.
default settings: Sx–1 and Sx–5 ON, and all others OFF. Do not
change these settings. Switches S2 through S5 may be covered
with an adhesive label.
MVIP bus
If the System Controller has two or more Quad T1 cards, the
ends of the MVIP bus should not be terminated. Remove jumpers
JP14 and JP16 from the TX2000 IP card in slot 16 (the last card
on the MVIP bus).
ends of the MVIP bus should not be terminated. Remove jumpers
JP14 and JP16 from the TX2000 IP card in slot 16 (the last card
on the MVIP bus).
16
H.100 bus cable
MVIP bus cable
Enable
termination
(S1 ON)
termination
(S1 ON)
Disable termination
(S1 OFF)
(S1 OFF)
T0001014
TX2000 IP
card
Quad T1 cards
4
5
6
7
8
9
Slot
Enable
termination
(S1 ON)
termination
(S1 ON)
Figure 2-10
H.100 bus termination
See also
Figure 2-14.
Figure 2-14.
For additional explanation of the H.100 and MVIP buses, see
Section 2.6.
Section 2.6.
IRQ and address
The Quad T1 card interrupt request (IRQ) and address are
automatically configured through the BIOS. They are not user
selectable.
automatically configured through the BIOS. They are not user
selectable.