Local Exchange Terminal POTS (L-POTS)
The LET Plain Old Telephone Service (L-POTS) plug-in card provides six loop start POTS circuits. The L-POTS card delivers Loop-Start-Only signaling with ring cadence following, on-hook transmission between ring bursts, and forward disconnect. The L-POTS card also provides a high on-hook DC resistance and a universal ringing detector. In addition, L-POTS card supports Call Message Waiting Indicator (CMWI) and is MLT (Mechanized Loop Testing) capable. Install the L-POTS plug-in card in the LET; install its counterpart, the RST POTS plug-in card (R-POTS), in the RST.
Features
- On-hook transmission (CLASS) capability
- Forward disconnect
- 900 Ω local exchange impedance
- Compatible with the following test systems MLT, Teradyne 4TEL and Reltec
- Call Message Waiting Indicator (CMWI)
Features
Scalability
You can insert the L-POTS card into any general purpose slot at a LET, allowing up to 100% slot population in a single shelf.
Voice Service
Install the L-POTS card in the LET to provide universal (TR-57) POTS service and install its counterpart, the R-POTS card, in the Remote Subscriber Terminal (RST).
Testing Capabilities
Compatible with the following test systems, including MLT, Teradyne 4TEL and Reltec.
Specifications
Physical
- Height: 5.125 in (13.018 cm)
- Width: 0.563 in (1.429 cm)
- Depth: 10.5 in (26.67 cm)
- Weight; 0.5 lb (0.23 kg)
Interfaces
- Six (6) 2-wire circuits
Power Consumption
- Maximum power consumption:
- Typical power consumption: 0.62 W
Alarm / Monitor / Test
- MLT
- Teradyne 4TEL
- Reltec
Environmentals
- Temperature: -40° to +149° F (-40° to +65° C)
- Relative Humidity: 5–95% noncondensing
- Altitude; Up to 10,000 feet
Compliance
- TR-TSY-000057
General
- End to end signaling delay (normal): < 50 ms
- Pulse distortion (pw > 50 msec); < 10 ms
- Ring detection: < 150 ms
- AC ringing load (20 Hz): 7 kΩ ± 10 %
- Ring detector sensitivity: 50 Vrms (17 to 33 Hz)
- Nominal DC input resistance: 930 Ω
- Normal open interval detector threshold: 10 mA ± 3 mA
- Maximum CO wiring resistance: 200 Ω
- Audio Companding: μ-Law
- Nominal VF input impedance: 900 Ω + 2.16 μF
- Nominal net loss (referenced 2-wire 900Ω): 0 dBm ± 0.4 dB
- Maximum VF overload level: +5 dBm
- 2-wire return loss: ERL 18 dB - SRL > 10 dB
- MLT/Teradyne DC Signatures On-Hook: Tip-to-Ground and Ring-to-Ground 430 kΩ and Tip-to-Ring > 2 MΩ
- MLT/Teradyne DC Signatures Off-Hook: Tip-to-Ground, Ring-to-Ground 430 kΩ and Tip-to-Ring 900Ω
- Reltec DC Signatures On-Hook: Tip-to Ground and Ring-to-Ground 445 kΩ and Tip-to-Ring > 2 MΩ
- Reltec DC Signatures Off-Hook: Tip-to-Ground and Ring-to-Ground 445 kΩ and Tip-to-Ring >1200 MΩ
- DLC Test Resources In Use Signatures: Tip-to-Ground, Ring-to-Ground 169 kΩ and Tip-to Ring 300 kΩ
LED Indicators
- FAIL (red)
- BUSY (green)
Management
- Craft User Interface (CUI)
- Tellabs Panorama Element Management System (EMS)
Software Support
- Minimum base software FP16 and higher
Installations
- Supported in Tellabs 1000 CBA
Ordering Information
- L-POTS: 0110-0150