Remote Subscriber Terminal POTS (R-POTS)
The RST POTS (R-POTS) plug-in card provides six circuits of standard loop start Plain Old Telephone Service (POTS) and supports a loop length resistance of 1830 Ohms. The R-POTS card is the Remote Subscriber Terminal (RST) counterpart to the loop terminating L-POTS plug-in card. The R-POTS card provides ring cadence following, local ring trip, on-hook transmission between ring-bursts, and forward disconnect. The card supports Call Message Waiting Indicator (CMWI).

Features and Benefits

  • On-hook transmission (CLASS) capability
  • Forward disconnect
  • 900 Ω structural impedance
  • 1830 Ω loop length resistance (including station)
  • Transient protection
  • Remote test access to metallic tip and ring
  • Call Message Waiting Indicator (CMWI)

Included Highlights

Testing Capabilities

The R-POTS card has backplane metallic tip-ring access to enable testing using the Metallic Test Unit (MTU) plug-in card. Use the R-POTS card with non-loaded cable.

Voice Service

Install the R-POTS card in the RST to provide universal (TR-57) POTS service and install its counterpart, the L-POTS card, in the Local Exchange Terminal (LET). Otherwise, configure an integrated switch interface (GR-303 or TR-8) at the LET to provide the R-POTS termination.


You can insert the R-POTS card into any general purpose slot at a RST, allowing up to 100% slot population in a single shelf.


  • Weight: 0.5 lb (0.23 kg)
  • Depth: 10.5 in (26.67 cm)
  • Width: 0.563 in (1.429 cm)
  • Height: 5.125 in (13.018 cm)
  • Six (6) 2-wire circuits
Power Consumption
  • Typical power consumption: 2.0 W
  • Maximum power consumption:
  • Altitude: Up to 10,000 feet
  • Relative Humidity: 5–95% noncondensing
  • Temperature: -40° to +149° F (-40° to +65° C)
  • GR-1089-CORE
  • TR-TSY-000303
  • TR-TSY-000057
  • 20 mA constant current @ 1830 Ω
  • Balance (compromise): 900 Ω
  • Longitudinal balance: > 58 dB (200 Hz - 3.0 kHz)
  • Two wire return loss ERL: > 18 dB
  • Maximum VF overload level: +5.0 dBm
  • Nominal loss (referenced to 2-wire 900 Ω): -2.0 dBm ± 0.5 dB
  • Nominal input impedance: 900 Ω
  • Audio Companding: μ-Law
  • On-hook detection threshold: > 9.0 kΩ
  • Off-hook detection threshold: < 2.0 kΩ
  • Open ckt. voltage - on hook transmission mode: 42.5 V min
  • Open ckt. voltage - normal mode (battery -52 V): 46 V min
  • Loop current: 25 mA constant current @ 600 Ω
  • Maximum loop length including station: 1830 Ω
  • Ring trip delay (85 Vrms, 20 Hz): < 150 msec
  • Ring trip detector (85 Vrms, 20 Hz): > 2000 Ω
  • Pulse distortion (pw > 50 msec): < 10 msec
  • End to end signaling delay (normal and reverse): < 40 msec
LED Indicators
  • BUSY (green)
  • FAIL (red)
  • Tellabs Panorama Element Management System (EMS)
  • Craft User Interface (CUI)
Software Support
  • Minimum base software FP16 and higher
  • Supported in Tellabs 1000 CBA
Ordering Information
  • R-POTS:
Product Specifications Sheet

Remote Subscriber Terminal POTS (R-POTS)
Product Specifications
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