LET Power Supply Unit (L-PSU)
The Tellabs 1000 LET Power Supply Unit (L-PSU) plug-in card converts the -48 V local exchange battery input into ±5 V and -32 V required by the common control equipment and line cards in the Tellabs 1000 MSA series Local Exchange Terminal (LET). The L-PSU uses a DC-to-DC switching converter for high efficiency and low thermal dissipation. Only one L-PSU is required to power each Tellabs 1000 MSAP Series LET shelf, however, a card slot is provided for a redundant L-PSU. The L-PSU features two GMT fuses for redundant source coordination. The first fuse protects the DC-DC converter and the second fuse protects the -48 V DC output.

Features and Benefits

  • High-efficiency switching DC-DC converter
  • Reverse input polarity protection
  • Output over-voltage and over-current shutdown
  • Low output voltage alarm
  • Low thermal dissipation

Included Highlights

Low Thermal

The L-PSU uses a DC-to-DC switching converter for high efficiency and low thermal dissipation to minimize impact on surroundings

Efficient Power

The L-PSU uses a DC-to-DC switching converter for high efficiency power generations in a compact form-factor.

High Reliability

Only one L-PSU is required to power an RST shelf; however, a card slot is provided for an additional redundant R-PSU. And, the R-PSU features input fusing for redundant source coordination

Specifications

Physical
  • Weight: 1.0 lb (0.45 kg)
  • Depth: 10.5 in (26.67 cm)
  • Width: 1.0 in (2.54 cm)
  • Height: 5.125 in (13.018 cm)
Power Consumption
  • The second fuse protects the -48 V DC output
  • The first fuse protects the DC-DC converter
  • The L-PSU features two GMT fuses for redundant source coordination
Alarm / Monitor / Test
  • Test jacks on the front panel can be used to monitor the system voltages.
  • The unit also provides alarm and status indications to the CPU.
Environmentals
  • Altitude: Up to 10,000 feet
  • Relative Humidity: 5–95% noncondensing
  • Temperature: -40° to +149° F (-40° to +65° C)
Compliance
  • GR-1089-CORE
General
  • Isolation output ground: Referenced to positive battery input
  • Isolation internal converter: 500 V input to output
  • Total available output power: 150 W
  • Output Current: +5 V DC 15 A, -5 V DC 2 A, -32 V DC 3 A, -48 V DC, 2 A
  • Ripple and Noise: ± 5 V DC, 1.0% peak-to-peak, -32 V DC @ 100 mV peak-to-peak
  • Output Regulation: ± 5.15 V DC, < 1.5% load, < 1.5% line, < 0.20% per specified temp range
  • Low voltage disconnect: -38 V DC
  • DC-DC Converter Output: +5.15 V DC ± 1.5%, -5.15 V DC ± 10.0%, -32.0 V DC ± 10%, -39 V DC to -56.5 V DC
  • DC-DC Converter Input: -40 V DC to -56.5 V DC
LED Indicators
  • FAIL (red)
  • FUSE (red)
  • ACTV (green)
Management
  • Tellabs Panorama Element Management System (EMS)
  • Craft User Interface (CUI)
Software Support
  • Minimum base software FP16 and higher
Installations
  • Supported in Tellabs 1000 CBA
Ordering Information
  • L-PSU: 0101-0078
Product Specifications Sheet

LET Power Supply Unit (L-PSU)
Product Specifications
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