Page 2.1
8/16 TRIBUTARY DAISY CHAIN SWITCH, BALANCED 40-795/796
pickering
SECTION 2 - TECHNICAL DESCRIPTION
SECTION 2 - TECHNICAL DESCRIPTION
A functional block diagram is provided in Figure 2.1. The Daisy Chain Module is powered by a +5V input via
Compact PCI connector J1. The interface to the user test equipment is via the front panel mounted 96-pin micro-D
connector, J2. The module comprises a motherboard and daughterboard populated with two pole relays configured
as Daisy Chain paths, Tributary paths and Loopback paths (the 8 tributary version of the module utilises the
motherboard only, whereas the 16 tributary version utilises both motherboard and daughterboard). The motherboard
and daughterboard are connected via ribbon cable. The relays are energised via control signals from relay drivers
U9 to U16 (40-795), or relay drivers U9 to U24 (40-796). 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.
Figures 2.2 and 2.3 provide a schematic representation of the Daisy Chain paths (Bank 1), Tributary (Rx/Tx) paths
(Bank 2) and Loopback paths (Bank 3). The Daisy Chain paths are used for low quality measurements, e.g. Bit Error
Rate Test. The Rx/Tx Select paths are used for high quality measurement e.g. Return Loss/SWR, Pulse Shape.
FUNCTIONAL DESCRIPTION
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