Specifications

OPS Line Card Specifications

Variants Available:

A-law (UK), µ-law (NA)

 

 

Number of Circuits per Card:

8 OPS Circuits

 

 

Power Consumption:

UK: 8.53 Watts

 

NA: 8.67 Watts

 

 

External Loop Resistance:

1800 ohms maximum

 

 

External Wire Resistance:

1600 ohms maximum

 

 

External Loop Length:

5853 meters (19022 ft.), 26 AWG (27 IWG)

 

15240 meters (49530 ft.), 22 AWG (23 IWG)

 

 

Minimum Conductor Leakage:

1500 ohms

 

 

Loop Detector Threshold:

12 mA (+1 mA)

 

 

Trip Battery Silent Interval:

-50 Vdc nominal

 

 

Trip Battery Ringing Interval:

-50 Vdc nominal

 

 

Bridged Ringers:

5 (C4 or equivalent)

 

 

Ringing Voltage and Frequency:

82 to 90 Vrms, 17 to 25 Hz

 

 

Features Provided:

2-wire/4-wire conversion

 

A-D/D-A Conversion

 

DC Loop Supervision and Dial Pulse Collection

 

Ground Button Detection and Ring Lead

 

Current Limiting

 

Self-Test Capability

 

Automatic Card Identification

 

 

Compliance:

Complies with all pertinent sections of EIA Standard RS-464.

 

 

OPS Line Card Message Waiting Switches

Eight message waiting switches (S1 through S8) are mounted on the OPS card. These switches are used to select the type of message-waiting signaling employed on each of the eight OPS line card circuits. Each circuit provides two message-waiting switch types.

Message-Waiting Switch Types

Setting Description

ACircuits are connected to OPS lines. Loop extended over the Message-Waiting Answer (MWA)/ Message-Waiting Busy (MWB) pair to the called extension.

BCircuits are connected to ONS lines. Consists of a -140 Vdc source delivered at a variable rate to the Ring lead of the called extension. Rate is custom programmed to be continuously on through 80 Hz.

Operation

Calls incoming to the OPS line card are converted from analog to digital signals by a line circuit module. The call is then switched and the two parties connected. All signals are passed through the 2-wire to 4-wire hybrid circuit on the line circuit module. The line busy status LED is turned on (lit) while the call is in progress.

Calls outgoing on the OPS line card are converted from digital signals to analog signals by a line circuit module. The main control processor oversees the connection between the two

Release 3.3

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Mitel 3300 manual Message-Waiting Switch Types, OPS Line Card Specifications, Setting Description

3300 specifications

The Mitel 3300 is a robust IP-PBX (Private Branch Exchange) designed to cater to the communication needs of businesses of varying sizes. Renowned for its versatility and extensive features, the Mitel 3300 supports both traditional telephony and modern IP-based communications, making it an ideal choice for organizations transitioning into a unified communications environment.

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