Rauland-Borg TC4 - User Manual

The Rauland Telecenter IV is a communication system designed for various applications, including administrative, staff, and intercom functions. It offers a comprehensive suite of features for call handling, paging, and system diagnostics, making it a versatile solution for managing internal and external communications.

Function Description:

The Telecenter IV serves as a central communication hub, integrating phone lines, intercom speakers, and call-in switches. It supports administrative lines, staff phones (both 16-link and single-link), and specialized lines for All-Page, DISA (Direct Inward System Access), DIL (Direct Inward Line), and AAI (Attendant Answer Intercom). The system's core functionality revolves around managing call traffic, enabling inter-station communication, and providing diagnostic tools for troubleshooting and maintenance.

Key functions include:

Call Handling: Manages incoming and outgoing calls, including transfers, hold, and direct dialing to extensions or external lines.
Paging and Intercom: Facilitates all-page announcements and two-way intercom communication through connected speakers and staff phones.
Call-in Management: Processes call-ins from various sources, distinguishing between normal and emergency call-ins based on ground resistance.
System Diagnostics: Provides a robust set of diagnostic tools, accessible via a display phone or a connected computer, to identify and resolve hardware and software issues.
Programming and Configuration: Allows for extensive programming of line attributes, location codes, and system parameters to customize functionality.

Important Technical Specifications:

The manual provides insights into several technical aspects:

Voltage Measurements: The system uses +12 Vdc and +5 Vdc for its MIO (Main Input/Output) board. Specific voltage ranges are provided for on-hook (less than 5 volts), off-hook (greater than 7 volts), and open circuit (6 volts +/- 0.5 volts) conditions on LLM (Line Link Module) multiplex (MPX) lines. Call-in switch status is determined by voltage levels on the T terminal: less than 100 mvolts for no call-in, over 600 mvolts for normal call-in, and 200 mvolts for emergency call-in (with a resistor).
Test Tone Levels: A 941 Hz test tone is available for audio measurements. Typical levels are .25 vrms (-10 dbm) at the receiver connection to an LLM (0 or 1) and .10 vrms (-17 dbm) across a phone line.
Loop Current: A line hybrid (U1) in an LLM (TC4150) should supply enough current for a phone to operate, with a minimum of 15 mA for off-hook detection. Actual loop current in a phone typically ranges from 25 to 50 mA.
Ground Resistance: A good ground connection should have a resistance of less than 1 ohm, corresponding to a voltage of less than 120 mvdc between the resistor and any MIO Z terminal.
Loss Measurement: The system aims for an Originator to Listener difference of less than 9db. Typical readings are 300 mvrms (0 db ref) for the Originator and 130 mvrms (-7 db) for the Listener.
Line Rebalancing: TCIV lines may operate with 10% to 30% unbalance, which can be reduced to less than 2% through rebalancing procedures.
Serial Port Communication: The CPU communicates via a serial port, requiring 8 bits, no parity, and full duplex operation. The baud rate is determined by a jumper setting on the CPU.
Hookflash Time: The TCIV's hookflash time can be programmed (Location Code 64014=65) to ensure proper transfer capability.
Trunk Line Voltages: Idle COA (Central Office Adapter) terminals CT and CR should show 48 Vdc. When busy, they should show 6-8 Vdc. LLM terminals T and R should show 12 Vdc when the line is idle. During ringing, LLM terminals T and R should show 6 Vdc.

Usage Features:

The Telecenter IV offers several user-friendly features and diagnostic modes:

Display Phone Diagnostics (#73): This is the primary diagnostic tool, allowing direct access to hardware functions via physical numbers, link numbers, and desired actions (e.g., relay on, phone line connect). It bypasses software attributes and location codes, making it ideal for hardware troubleshooting. The display shows the Subject physical number (NNNN), Link Number (LL), VCM Intercom status (V), Hook switch (H) and Call-in switch (T) status (HT), and Number of Active Lines (AA).
- Keypad Commands: The display phone keypad is used for various commands:
  - [1] Connects the subject line to the LLM link or connects the test phone to an in-use line.
  - [2] Turns on a speaker relay.
  - [3] Connects a single link staff phone relay.
  - [4] Disconnects the LLM line or the test phone from an in-use line.
  - [5] Turns off the speaker relay.
  - [6] Disconnects the single link staff phone relay.
  - [7] Increments the physical number.
  - [8] Increments the link number.
  - [9] Starts a 941 Hz test tone.
  - [0] Decrements the link number.
  - [*] Decrements the physical number.
  - [#] Stops the 941 Hz tone or produces a DTMF tone.
Call-in Sensitivity Adjustment (#74): This procedure allows adjustment of the RP2 potentiometer on the MIO to ensure proper detection of call-ins.
LLM Line Link Test (#75): This test checks all LLM functions for each line, including off-hook sense, audio to each link, DC, and ringing. It allows for the identification of faulty links by observing interruptions in the test tone.
Computer Aided Diagnostics: A computer connected to the TCIV CPU via a serial port provides advanced system analysis.
- Serial Port Monitor Commands: A set of single-letter and hexadecimal commands allows direct interaction with the TCIV's monitor program for tasks like setting reference addresses, storing bytes in memory, displaying bytes, halting/restarting the program, sending/receiving data blocks, and calling functions.
- Other Serial Port Output: Provides data entry logging (#23), call-in and answer logging (Location Code 64206), and keystroke monitoring (Location Code 64012) for detailed system activity tracking.
Phone Line TAP Functions: Comdial phones offer a TAP function for transfers, ensuring calls are not lost during the transfer process.
Cradle Switch Test: Verifies the functionality of the cradle switch for hook-flash and disconnect.
Lockout Functions: Allows temporary lockout of bad lines, links, or receivers for testing or until repairs can be made.
Statistics (#98): The system keeps detailed statistics on various activities, including resets, active lines, completed calls, call-ins, outgoing interconnect calls, maximum links in use, maximum active lines, receiver faults, console interface adapter resets, console data faults, and lost console commands. These statistics are valuable for analyzing traffic and troubleshooting.
Location Codes (#98): A comprehensive list of programmable location codes allows for fine-tuning system parameters, such as attendant numbers, time-zone tones, hook flash times, and display settings.
Line Attributes and Options (#99): Allows programming of specific attributes for different line types (Admin, Staff, Special Page, DIL, AAI, etc.) to define their behavior and access privileges.
Dial Codes: A list of special dial codes provides quick access to various system functions, including All Page (#00), EEPROM Checksum (#71), Phys. Nmbr Lookup (#72), I/O Diagnostic (#73), RP2 Adjust (#74), LLM Diagnostic (#75), and Location Edit (#98).

Maintenance Features:

The manual emphasizes several maintenance and troubleshooting procedures:

TCIV Find-It Fix-It Procedures: A quick reference guide for common symptoms and their solutions, including:
- System Won't Run / Locks Up: Steps involve checking voltages, verifying computer communication, ensuring secure board connections, correct programming, RP2 adjustment, and PROM version.
- System Will Not Program: Checks for correct phone attributes, display integrity, and EEPROM jumper setting.
- Phone Won't Ring: Verifies line attributes, line hybrid integrity, direct seizure modification, and architectural number uniqueness.
- Time Tones Do Not Work: Checks Z terminal connections, master clock activation, programming of time tone durations, amplifier input levels, and MTG manual activation.
- All-Page Problem: Checks LLM Port #2 output, MIO seating, amplifier controls, electronic key phone settings, and receiver decoding.
- Phone Rings-Back Upon Hanging Up: Addresses hook-flash issues and unanswered transfer calls.
- System Misdials or Won't Allow Access (Intermittent): Focuses on receiver diagnostics and temporary lockout solutions.
- Talk Path Noisy or Dead (Intermittent): Utilizes #75 diagnostic to identify faulty LLM lines, connectors, or line hybrids.
- Crosstalk On Lines: Emphasizes correct twisted pair wiring, power supply grounding, repeater amp grounding, and line rebalancing.
- Phone Rings When Call Should Go To Attendant: Addresses attendant line configuration, overflow handling, and location code programming.
- False Call-ins After All-Call or Time Tones: Checks amplifier gain, signal ground, possible oscillations, RP2 adjustment, and SC25 flat cable connections.
Ground Resistance Measurement: A procedure to verify the quality of the system ground.
Loss Measurement: A method to quantify signal loss on TCIV lines.
Line Rebalancing Procedure: A detailed process to reduce crosstalk by balancing line impedance.
Console Interface Adapter (TC4420) Test: A procedure to test the communication function of the interface board without the console connected.
LCD Display Problems: Troubleshooting steps for display issues, including initialization, viewing angle, voltage checks, and data signal verification.
Single Link Staff Phone Problems: Addresses issues like other phones being disabled, inability to make a speaker call private, and unclearable call-ins, with checks on DIP switch settings, line attributes, and wiring.
Speaker Intercom Problems: Verifies VCM attributes and special page algorithm settings.
Interconnect Problems: Comprehensive checks on wiring from C.O. to demarcation block, COA and LLM circuitry, programming, and remote station wiring, including voltage checks on COA and LLM terminals.

Overall, the Rauland Telecenter IV is designed for robust communication management with extensive diagnostic and maintenance capabilities, ensuring reliable operation and efficient troubleshooting.

Rauland-Borg TC4 Specifications

General

Brand	Rauland-Borg
Model	TC4
Category	PBX
Language	English

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Rauland-Borg Telecenter IV

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Rauland-Borg TC4 - User Manual

Table of Contents

Other manuals for Rauland-Borg TC4

Summary

DISPLAY PHONE DIAGNOSTICS

#73 Hardware I;O Diagnostic

General Procedures

LL = Link Number

V = Activate VCM Intercom

HT = Hook switch (H) and Call-in switch (T) status

AA = Number of Active Lines

Key Function

Notes

Keypad

System Halting and Voltage Measurements

Summary

Voltage Measurement Steps

Line Type Tests

Summary

Note

C.O. & PBX Trunks

Special Notes on Central Office Trunks

Speakers

Summary

Speaker Testing Steps

Note

Phone Lines

Method 1

Method 2

Call-in Switches

Summary

Call-in Switch Testing Steps

Call-in Sensitivity (RP2) Adjustment

Summary

RP2 Adjustment Steps

LLM Line Link Test

Summary

LLM Line Link Test Steps

COMPUTER AIDED DIAGNOSTICS

Computer Monitor Set-up

Summary

Caution

Computer Monitor Setup Steps

Serial Port Monitor Commands

Summary

Commands Reference

Other Serial Port Output

Data Entry

Call in & Answer Logging

Keystroke Monitoring

Keystroke Monitoring Steps

TCIV TROUBLESHOOTING AND REPAIR

TCIV Find-It Fix-It

Time Saving Hints and Suggestions

System Wont Run; Locks Up Troubleshooting Steps

System Will Not Program Troubleshooting Steps

Phone Wont Ring

Phone Wont Ring Troubleshooting Steps

Time Tones Do Not Work

Time Tones Do Not Work Troubleshooting Steps

All-Page Problem

All-Page Problem Troubleshooting Steps

Phone Rings-Back Upon Hanging Up

Phone Rings-Back Upon Hanging Up Troubleshooting

System Misdials or Wont Allow Access (Intermittent)

System Misdials or Wont Allow Access Troubleshooting

Talk Path Noisy or Dead (Intermittent)

Talk Path Noisy or Dead Troubleshooting

Crosstalk On Lines

Crosstalk On Lines Troubleshooting

Phone Rings When Call Should Go To Attendant

Phone Rings When Call Should Go To Attendant Explanation

False Call-ins After All-Call or Time Tones

False Call-ins After All-Call or Time Tones Troubleshooting

Supplementary Procedures

Finding Duplicate Numbers

Phone Line TAP Functions

Transfer Capability Test

Cradle Switch Test

Cradle Switch Test Procedure