Page 2.1
8 TRIBUTARY 75Ω DAISY CHAIN SWITCH 40-792
pickering
SECTION 2 - TECHNICAL DESCRIPTION
SECTION 2 - TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
A functional block diagram is provided in Figure 2.1. The Daisy Chain Module is powered by +5V and inputs via
Compact PCI connector J2. The interface to the user test equipment is via the front panel mounted 96-pin micro-D
connector, J1. The module comprises a PCB populated with relays configured as Daisy Chains and tributaries.
The relays are energised via control signals from relay drivers U8 to U12. The relay drivers are addressed by PCI
bridge U1, via the control logic, to output the required signal. Module configuration is determined by data stored in
EEPROM U7. PCI Bridge U1 is configured by EEPROM U2.
Figure 2.2 provides a schematic representation of the Daisy Chain and Tributary (Rx/Tx) paths. The Daisy Chain
paths are suitable for low quality measurements, e.g. Bit Error Rate Test. The Rx/Tx Select paths are suitable for
high quality measurement e.g. Return Loss/SWR, Pulse Shape.
96-PIN MICRO-D
CONNECTOR
J1
MODULE
CONFIGURATION
U7
PCI
BRIDGE
U1
PCI BRIDGE
CONFIGURATION
U2
TERMINATING
RESISTORS
R3 TO R14
COMPACT PCI
BUS
CONNECTOR
J2
+5V
0V
CONTROL
LOGIC
U3, U4,
U5, U6
U8
LINE
DRIVER
RL1, 2, 5, 52,
53, 54, 56, 64
RL3, 4, 6, 7,
8, 9, 11, 12
U9
LINE
DRIVER
RL10, 13, 14,
15, 16, 17, 18,
19
U10
LINE
DRIVER
RL20, 21, 22,
23, 24, 60, 62,
63
U11
LINE
DRIVER
RL55, 61
U12
LINE
DRIVER
Figure 2.1 - 8 Tributary 75Ω Daisy Chain Switch: Functional Block Diagram
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