Power Subsystem Description - Alcatel 1850 TSS-320 Technical Handbook
Metro core transport service switch
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Also See for 1850 TSS-320:
- Technical handbook (276 pages) ,
- Commissioning handbook (108 pages)
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3.1.2.3 Loopbacks
For Test and maintenance purposes Loop back capabilities are located on BCM8152 SerDes and
FERMAT Fpga.
–
BCM8152 provides both "Line" side and "Equipment" side Loopback with granularity at Section level
(i.e. on the whole STM64). These Loopbacks are controlled via SPI bus and GOBLIN_4G parallel
I/O.
•
In "Line side Loopback", the following two operating modes are allowed:
–
"Loop and continue"
–
"Loop and send AIS" (note: AIS insertion towards backplane must be forced via FERMAT
Fpga)
•
In "Equipment side Loopback" only "Loop and continue" operating mode is supported.
–
FERMAT Fpga provides both "Line" side and "Equipment" side Loopbacks with 64xVC4 granularity
(i.e. on the whole payload). These Loopbacks are controlled via ISPB bus.
In both "Line side Loopback" and "Equipment side Loopback", the following operating modes are
supported:
•
"Loop and continue"
•
"Loop and send AIS"
3.1.3 Power subsystem description
Distributed power supply architecture on card is constituted by an input power stage and a set of compact
DC/DC converters.
The input power stage provides circuitry to:
•
monitor the presence of the battery A/B voltages after the input fuses
•
perform the OR-ing of the batteries
•
perform over-voltage and under-voltage protection on 48V power bus
•
control the inrush current at the start-up, plus the EMI filtering
The main unit power supply voltages are generated as follows:
•
2 isolated DC/DC converters to derive +5.0V and +1.2V operating voltages from the 48V back-
plane bus
•
1 isolated DC/DC converter to derive -5.2V operating voltage from the 48V backplane bus
•
3 small non-isolated Step Down (5A) to obtain +2.5V, +1.8V, +1.5V from the +5V
•
1 small non-isolated Step Down (16A) to obtain +3.3V from +5V
An additional service voltage at 3.3VS, obtained from a duplicated 3.6V (V3A, V3B) coming from
backpanel, is used for on-board SPI circuitry: Remote Inventory device, status Leds, Goblin_4G and Kyra
Cpld.
Alcatel 1850 TSS-320 Rel.1.1
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8DG 07734 CAAA Edition 01
Technical Handbook SDH
Units Description
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