RPOTS-24 description The Calix RPOTS-24 plug-in card provides 24 two-wire, current-source analog interfaces. You can configure each interface for POTS, UVG, PLAR, or 2WTO to deliver a wide variety of DS0 services from a single plug-in card.

You can plug the RPOTS-24 into any of the 20 universal slots on the Calix C7 shelf. Standard 25-pair RJ-21 connectors on the back of the Calix C7 shelf provide physical access to each DS0 interface.

Key attributes Service flexibility: In addition to POTS services, the RPOTS-24 plug-in card supports special services typically requiring separate plug-in cards, including DOD, FXS, and PLAR. This multiple service offering out of a single plug-in card reduces warehousing and logistic costs, and guarantees optimum slot utilization even when deploying small quantities of narrowband special services. Switch interfaces: The RPOTS-24 plug-in card uses either a universal or integrated interface to a Class 5 switch to provide service. The universal interface requires an HPOTS-24 plug-in card for connection to the switch. An integrated interface requires a GR-303 uplink to the switch. Intelligent power management: Traditional service delivery systems are designed to drive all loops as if they were the longest supported by the system. This “worst case scenario” approach can be very inefficient in high-density deployments where short loops do not require high voltages to guarantee minimum loop currents. The Calix C7 eliminates excess power consumption by automatically adjusting the drive voltage of POTS lines to the minimum required based on loop lengths. Metallic test access: The Calix C7 supports metallic test access for equipment and facility testing of metallic circuits. Service technicians can perform onsite metallic testing through the AMP plug-in card via a direct connection in the front of the Calix C7. Service technicians can also perform remote automated testing through a rear access connection by a third-party test head. RPOTS-24 specifications Ports
24 programmable analog interfaces per card
20 cards per shelf
480 analog interfaces per shelf
2400 analog interfaces per rack (5 shelves)

15 REN/card ring source

Signaling Modes
Loop-Start (LS), Ground-Start (GS), Loop-Reverse-Battery (LRB), Transmit-Only (TO) or Private Line Automatic Ringdown (PLAR).

Programmable through craft interface
600 ohms + 2.16 uf
900 ohms + 2.16 uf

Return Loss
Echo return loss:
600 ohms > 28 dB
900 ohms > 28 dB
Ringing return loss:
600 ohms > 20 dB
900 ohms > 20 dB

Insertion Loss
2 dB to 5 dB

Idle Channel Noise
< 18 dBrnC

Subscriber Loop Length
1830 ohms including telset

POTS On-Hook Voltage
42 +/- 2 volts (at the set)

Loop Current
During normal operation: 21 mA
During battery backup: 19 mA

-3 dB to +7 dB for A to D, Provisionable with auto-detection capability
-7 dB to +3 dB for D to A, Provisionable with auto-detection capability

On-Hook Transmission
+/- 1.0 dB gain adjust tolerance in the transmit and receive directions

Frequency Response
400 Hz to 2800 Hz: +/- .5 dB

Status Indicators
FAIL: Red – Card has failed
ACTIVE: Green – One or more lines are provisioned
BUSY: Green – At least one line is off-hook

Power Requirements
Input: -48 VDC
Range: -42.75 VDC to -56 VDC

Power Dissipation
Off hook: 0.75 watts per circuit
On hook: 0.15 watts per circuit

Physical Dimensions
9.3″ H x 0.7″ W x 9.0″ D

Operating temperature: -40 C to +65 C
Humidity: 5% to 90% non-condensing
Altitude: Up to 13,125 feet
Storage temperature: -40 C to +70 C
Click to view an enlarged block diagram. Get Shockwave player If you do not see the media above, click the link to download and install the Shockwave player. Standards support Telcordia, TR-NWT-00057, “Functional Criteria for Digital Loop Carrier Systems Issue 2, January 1993.
Telcordia, GR-303-CORE, “Integrated Digital Loop Carrier System Generic Requirements, Objectives, and Interface”, Issue 2, December 1998.
Telcordia, TR-TSY-000008, “Digital Interface between the SLC96® Digital Loop Carrier System and a Local Digital Switch”, Issue 2, August 1987.
Telcordia, TR-TSY-000465, “Interface Between Loop Carrier Systems and Loop Testing Systems”, April 1987.
Telcordia, GR-499, “Transport Systems Generic Requirements”, Issue 2, December 1998.
ANSI T1.401, “Analog Voicegrade Switched Access Lines Using Loop-Start and Ground-Start Signaling”, 1993.
ANSI T1.401.01, “Analog Voicegrade Switched Access Lines Using Loop-Start and Ground-Start Signaling With Line-Side Answer Supervision Feature”, 1994.
ANSI T1.401.02, “Analog Voicegrade Switched Access Lines With Distinctive Alerting Features”, 1995.
ANSI T1.401.03, “Analog Voicegrade Switched Access Lines With Calling Number Delivery, Calling Name Delivery, or Visual Message-Waiting Indicator Features”, 1998.
ANSI T1.401.04, “Analog Voicegrade Switched Access Lines With the Call Waiting, Distinctive Call Waiting, or Calling Identity Delivery on Call Waiting Feature”, 2000.
ANSI T1.401.05, “Analog Voicegrade Switched Access Lines With Network-Implemented Coin-Operated Payphone Feature”, 2000.
ANSI T1.405, “Direct-Inward-Dialing Analog Voicegrade Switched Access Using Loop Reverse-Battery Signaling”, 1996.

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