RT062

The RT062 comprises a single Subscriber Line Interface Circuit (SLIC) in a single-in-line (SIL) 13 pin format. The combination of features and packaging offers extremely efficient use of board area, saving significant system size and cost.

The SLIC is highly featured requiring a minimum of external components. Functions such as a relay driver, are provided on board along with precision loop feed resistors.

The RT062 has been designed to work in private systems where cost is a major concern and advanced public network signalling is not a requirement.

The system interface has been designed for direct connection to popular codecs for both audio and signalling.

The RT062 is ideal for any application where high-density line interfacing is required, such as Computer Telephony Integration (CTI), Small Office Home Office (SOHO) and PABX.

相关产品

 
 

RT062

 Low-cost-long-line-CO-SLIC-module

 Product Description

 

 

 

 

 

 

Version

Date

Author

Approved By

Remarks

V1.0

2012/3/14

LI xiao yan

Rock

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

© 2022 Shenzhen Ring&tone  Electronic Technology Co., Ltd. All rights reserved.

This document contains proprietary information of ring&tone and is not to be disclosed or used without the prior written permission of ring&tone.

Due to update and improvement of ring&tone products and technologies, information in this document is subjected to change without notice.

 

FEATURES

  • Single-in-line (SIL) PBX SLIC with integral lead frame.
  • Highly integrated, requiring a minimum of external components.
  • Constant current feed to the line, with constant voltage fold
  • Single +5V system side power
  • 16mA minimum loop current into 2000R loop (including telephone set).
  • 600R impedance.
  • Works with a battery of up to –72V.
  • Low idle power operation (20mW).
  • Short circuit
  • On hook
  • Loop open function - loop off under logic

Description

The RT062 comprises a single Subscriber Line Interface Circuit (SLIC) in a single-in-line (SIL) 13 pin format. The combination of features and packaging offers extremely efficient use of board area, saving significant system size and cost.

The SLIC is highly featured requiring a minimum of external components. Functions such as a relay driver, are provided on board along with precision loop feed resistors.

The RT062 has been designed to work in private systems where cost is a major concern and advanced public network signalling is not a requirement.

The system interface has been designed for direct connection to popular codecs for both audio and signalling.

The RT062 is ideal for any application where high-density line interfacing is required, such as Computer Telephony Integration (CTI), Small Office Home Office (SOHO) and PABX.

  • Line Interfacing

As well as being in an electrically demanding environment, the needs of different applications and regulatory standards means that the SLIC must allow flexibility, together with facilities to ensure robust performance. The RT062 SLIC provides a complete and flexible interface to the telephone line.

  • Battery Feed

The battery feed to the telephone line used by the RT062 can vary between -42V and -72V. For public network applications -48V is the most common. A constant current is fed to the line, which is preset to 25mA.

If the loop length is such that the constant current feed cannot be maintained, then the RT062 will revert to a constant voltage source, allowing the loop to be serviced at a reduced loop current. Typically with a 2000R loop, and -48V battery voltage, loop current is 18.5mA.

The power dissipated in the RT062 SLIC is internally limited to a safe value.

  • 3 Ringing

The ringing signal is provided by an external ringing generator and is switched onto the line by the user provided ringing relay. The coil of the ringing relay should be connected to a positive supply voltage (normally +5V) and the open collector driver RDO. The relay is activated by applying a logic high to RDI. Note: a flyback diode must be connected across the coil.

Unbalanced ringing is supported on the RT062 via the use of a single external relay (with single pole changeover).

When the “off-hook” condition occurs during ringing (as indicated when SHK produces a logic level 1), a logic level 0 should be applied to RDI. This will deactivate the relay, and remove the ringing signal from the line. The SLIC will then assume it’s constant current feed condition.

  • The 2-4 Wire (hybrid) Conversion.

This is also referred to as the hybrid function. The RT062 transmits and receives balanced 2-wire analog signals at the Tip and Ring connections. These are converted to a ground referenced output at VOUT and from a ground referenced input at VIN.

VOUT and VIN are normally connected to a Codec for conversion to and from a digital Pulse Code Modulated (PCM) stream.

  • Transmit and Receive Gain.

The gain in both the transmit direction (TIP/RING to VOUT) and the receive direction (VIN to TIP/RING) is set to -1dB. Normally any gain adjustments required by  the user can be made by using the Codec.

  • The 2 Wire Impedance.

The input impedance, Zin, of the RT062 SLIC is set to 600R. For countries where the line impedance is 600R

e.g. North America and the Far East, no external adjustment is required. For countries where an alternative line impedance is used the Codec filter characteristics can be programmed to give the required matching.

The Codec manufacturer will provide information on how Codec programming is accomplished. Programmable Codecs require information about the transfer characteristics of the SLIC with which they are working, which is contained in a “.CIR” netlist. A “.CIR” netlist can be obtained by contacting either Silver Telecom or your local representative, to allow the Codec programming coefficients to be generated.

If a simple Codec is being used, the RT062 can only accommodate countries where the line impedance is 600R.

  • Network Balance Impedance.

The network balance impedance, Zb, is set to 600R for the RT062. For countries where the network balance impedance is 600R e.g. North America and the Far East, no external adjustment is required. For countries where an alternative network balance impedance is used the Codec filter characteristics can be programmed to give the required matching. The “.CIR” netlist is again needed to allow the Codec programming coefficients to be generated.

If a simple Codec is being used the RT062 can only accommodate countries where the line impedance is 600R.

  • On Hook Transmission.

The RT062 is capable of on-hook transmission with the addition of a 20k, 0.25W resistor from Tip to Ring. This means analog signals can be transmitted from VIN through Tip and Ring and onto the line even when no loop current is flowing. This can be  used  when sending Caller Line Identification (CLI) information or for other “no ring” calls. With the tip-ring resistor fitted, idle current increases by 2.2mA.

  • Pin Description:

Pin #

Name

Description

1

RING

Ring. Connects to the subscriber line Ring through the n/c pole of the ringing relay.

2

TIP

Tip. Connects to the subscriber Tip.

3

TC

Tip Clamp. A diode must be connected externally between TC and Tip to conduct ringing current.

4

RT

Ring Trip. A capacitor is connected externally between RT and GND to filter out the AC component of the ringing signal. Must be switched out during LD dialling.

5

GND

Analog Ground. Normally connected to system ground.

6

VR

Audio In. This is the analog input signal from the codec (which is output on Tip and Ring).

7

VCC

+5V Positive Supply. This pin must be connected to +5V.

8

VX

Audio Out. This is the analog output signal (from Tip and Ring) to the codec.

9

VBAT

Battery Voltage. The negative supply rail. Typically -48V.

10

SHK

Switch Hook Current. Indicates loop current is flowing (such as when off hook) when at logic 1.

11

LO

Loop Off. A logic 1 removes loop current, used during fault conditions.

12

RDI

Relay Driver Input. A logic 1 activates RDO.

13

RDO

Relay Driver Output. Open collector relay driver, connects to the coil of the ringing relay.

 

 

  • RT062 Product Selector

 

Marking

 

 

 

 

 

 

 

 

Package

RT062

 

 

 

 

 

 

 

 

SIL

 

 

 

 

 

 

 

 

 

 

 

  • Package Size (mm   ±3mm )
  • PCB Decal (mm ±3mm )