Section 2: PCB Installation and Startup
2-34 Section 2: PCB Installation and Startup Aspila EX Hardware Man-
BRI (2/4/8BRIU) Interface PCB (Figure 2-15)
The BRI PCB provides:
• 2 (2BRIU), 4 (4BRIU), or 8 (8BRIU) 2-Channel Circuits (2B + D) configured as T-Bus or S-Bus
• 64 Kb/s B-Channel and 16 Kb/s D-Channel
• 2 (2BRIU), 4 (4BRIU) or 8 (8BRIU) trunk/extension status LEDs
• 1 PCB status LED
• 1 run/block switch
The BRI Interface PCB uses a single universal slot. A maximum of 16 2/4BRIU PCBs can be installed.
With the 8BRIU PCBs, a maximum of 13 PCBs can be installed when used for T-Bus connections - 16
PCBs can be installed when used for S-Bus connections. Each circuit connects to the network via an
NTI Network Termination. With the maximum number of PCBs installed, the following can be pro-
vided:
• Sixteen 2BRI cards provide 32 BRI circuits (64 BRI channels).
• Sixteen 4BRI cards provide 64 BRI circuits (128 BRI channels).
• Twelve 8BRI cards, when used as T-Bus, provide 96 BRI circuits (192 BRI channels).
• Sixteen 8BRI cards, when used as S-Bus, provide 128 BRI circuits (256 S-Bus station ports).
The BRI circuit can be connected to either an ISDN trunk or ISDN telephone set, depending on the set-
ting of program 10-03, the polarity of the Tx & Rx of each circuit is set by SW102 through SW802
switch settings on the BRI PCB. When used for S-Bus, a maximum of 8 ISDN terminals can be con-
nected to each circuit.
The first 4 circuits (1-4) are supplied with DC power from the Aspila EX system when set to S-Bus
mode in program 10-03. If the last four circuits (5-8) are to be used for S-Bus, they must use ISDN
telephone sets which provide their own local power supply as the system does not provide DC power
to these circuits.
Setting the SW100-SW800 Switches
In the following cases, the SW100-SW800 switches should be set to the ON position: (SW100-SW800
are set ON at the factory).
• When the channel is assigned as a T-Bus Point-to-Point.
• With T-Bus Point-to-Multipoint and if the system is connected at the end of the multipoint.
• If the channel is assigned as S-Bus.
Otherwise, the SW100-SW800 switches should be set to the OFF position.
Switch
Name
Switch
Position
Result Comments
SW2 RUN PCB Active Normal operating mode
BLK PCB Not Active A new incoming call or new outgoing call will not be
initiated on the ISDN line when the switch is set to
“BLK”.
SW102
SW202
SW302
SW402
SW502
SW602
SW702
SW802
T T-Bus Connection The polarity of the Tx and Rx are defined in the T-Bus
table
S S-Bus Connection The polarity of the Tx and Rx are defined in the S-Bus
table
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