TC Communications TC1912 Ethernet Telephone Extender User Manual

TC Communications TC1912 Ethernet Telephone Extender

Product Information: TC1912 Ethernet Telephone Extender

The TC1912 Ethernet Telephone Extender enables telephone service over a LAN via 10/100Base-T Ethernet connections. It has a built-in Codec that digitizes voice and converts to packets for transmission between local and remote TC1912s. It is compatible with PBX and Key Systems (POTS).

TC1912 connections can be made by most types of Ethernet devices, including switches, hubs, routers, bridges, transceivers, etc. A Web-based Configuration user interface (most browsers including Microsoft Windows Explorer, etc.) is provided to view network settings or change IP addresses from the factory default.

The TC1912 provides Toll Quality sound within voice bandwidths from 300Hz to 3.4 Khz. Two types of voice applications are supported: one, connecting to a PBX for outside telephone service; two, setting up a hot link point-to-point connection, e.g. between two work stations, within a LAN. Two-wire FXS (foreign exchange subscriber) is provided on the telephone side with ring down capability and FXO (foreign exchange office) on the PBX side.

The TC1912 also supports two or four wire analog interface. The analog interface is for FSK (frequency shift key) applications. The analog interface has a 600 ohm isolation audio transformer. The analog voltage can be 0 to 3 Vpp.

Eighteen LEDs for network status, phone status, power and volume are provided to enhance status monitoring and diagnostics. Dry contacts for external alarm and ringer are standard. The TC1912 is available in standalone (TC1912S) or rackmount (TC1912R) versions. Power is standard 12VDC with optional 24VDC or 115/230VAC with an external power cube. Power redundancy is standard. 100Base-T connectors are RJ-45 Female and Phone connectors are RJ-11 Female.

Product Usage Instructions

To use the TC1912 Ethernet Telephone Extender, follow these instructions:

1. Connect the TC1912 to an Ethernet device, such as a switch, hub, router, or bridge, using the 100Base-T RJ-45 Female connector.
2. Connect the telephone to the TC1912 using the RJ-11 Female connector.
3. Use the Web-based Configuration user interface to view network settings or change IP addresses from the factory default.
4. To connect to a PBX for outside telephone service, use the FXO (foreign exchange office) on the PBX side.
5. To set up a hot link point-to-point connection between two work stations within a LAN, use the two-wire FXS (foreign exchange subscriber) on the telephone side with ring down capability.
6. To use the analog interface for FSK (frequency shift key) applications, ensure that the analog voltage is set between 0 to 3 Vpp.
7. Use the eighteen LEDs for status monitoring and diagnostics, including network status, phone status, power, and volume.
8. Use the dry contacts for external alarm and ringer as needed.
9. If using the standalone version, power the TC1912 using the standard 12VDC with optional 24VDC or 115/230VAC with an external power cube. If using the rackmount version, ensure that power redundancy is standard.

Notice!
Although every effort has been made to ensure that this manual is current and accurate as of date of publication, no guarantee is given or implied that this document is error free or accurate with regard to any specification. TC Communications, Inc. reserves the right to change or modify the contents of this manual at any time without prior notification.
© COPYRIGHT 1992-2023. ALL RIGHTS RESERVED.

Chapter 1 – Overview

Features

• 2-Wire Analog Telephone FXS/FXO Interface 0 Two or Four Wire Analog 600 Ohm Interface
• Toll Voice Quality with Ringdown Capability O Master or Slave switchable
• Echo Cancellation O RJ-45 Female Connector for the 10/100 Base-T Signal
• LEDs Indicate telephone and network status
• Various Power Voltages Available: 12VDC or Optional 24VDC, or 115/230VAC.
• Stand Alone or Rackmount

Description
The TC1912 Ethernet Telephone Extender enables telephone service over a LAN via 10/100Base-T Ethernet connections. It has a built-in Codec that digitizes voice and converts to packets for transmission between local and remote TC1912s. It is compatible with PBX and Key Systems (POTS). TC1912 connections can be made by most types of Ethernet devices, including switches, hubs, routers, bridges, transceivers, etc. A Web-based Configuration user interface (most browsers including Microsoft Windows Explorer, etc.) is provided to view network settings or change IP addresses from the factory default.
Phone connection is automatic upon power-up or when network interruption is restored. Depending on network traffic, multiple pairs of TC1912s can be used to set up individual point-to-point telephone links. An extreme temperature version (-20°C to +70°C), Model TC1912T, is available for harsh environments.
The TC1912 provides Toll Quality sound within voice bandwidths from 300Hz to 3.4 Khz. Two types of voice applications are supported: one, connecting to a PBX for outside telephone service; two, setting up a “hot link” point-to-point connection, e.g. between two work stations, within a LAN. Two-wire FXS (foreign exchange subscriber) is provided on the telephone side with ring down capability and FXO (foreign exchange office) on the PBX side.
The TC1912 also supports two or four wire analog interface. The analog interface is for FSK (frequency shift key) applications. The analog interface has a 600 ohm isolation audio transformer. The analog voltage can be 0 to 3 Vpp.
Eighteen LEDs for network status, phone status, power and volume are provided to enhance status monitoring and diagnostics. Dry contacts for external alarm and ringer are standard. The TC1912 is available in standalone (TC1912S) or rackmount (TC1912R) versions. Power is standard 12VDC with optional 24VDC or 115/230VAC with an external power cube. Power redundancy is standard. 100Base-T connectors are RJ-45 Female and Phone connectors are RJ-11 Female.

Front Panel

LEDs

• “PWR A/B” LED: It is on when power is present at PWR A/B connector on rear panel.

• “VCC” LED: It is on when adequate power is being derived from the power source.

• “SW CTR” LED: It is on when the Saved Settings equal the Default Settings. Otherwise, it will be Off.

• “ALARM” LED: It will flash under the following conditions.

  • No Ethernet signal is detected. “LNK” LED will flash.
  • Communication link between Master and Slave is lost. “Sync” LED will flash.
  • Interface (FXS/FXO/Analog) is not working properly. “CH-S” LED will flash.
  • Both Master and Slave are set to FXO. “HT-L” LED will flash.
  • “DFLT” switch is on. “MSTR” or “SLVE” LED will flash.

• “LINK” LED: It is on when proper Ethernet signal is detected and flashing when it is not.

• “ACT” LED (Activity): It is on when data traffic is detected at the Ethernet port. It is normal that the LED will turn on occasionally.

• “SYNC” LED: It is on when the communication link is established between the TC1912 pair (master and slave.) It will flash and the alarm will turn on if the communication link is lost for more than 15 secs. The TC1912 pair will automatically re-establish the link after any power or network disruption.

• “DHCP” LED: Not used.

• “ECHO CNCL” LED (Echo Cancellation): It is on when the Echo Cancellation option is turn on. It will be off when echo cancellation option is off. It will flash when modem tone is detected. Echo canceller disabled.

• “32K/16K CP-R” LEDs: Future release.

• “TX / RX VOLUME” LEDs: The LEDs indicate the volume levels on both outgoing and incoming voice signals.

• “FXS” LED: It is on when the unit is set to FXS.

• “FXO” LED: It is on when the unit is set to FXO.
  NOTE: If the TC1912 is configured for 600 Ohm analog: Both “FXS” and “FXO” LEDs will be Off.

• “SLVE” LED (slave): It is on when the unit is set to slave. It will flash when “DFLT” is on.

• “MSTR” LED (master): It is on when the unit is set to master. It will flash when “DFLT” is on.

• “OFHK” LED (off hook): It will turn on when the user picks up the handset.

• “RING” LED: It will turn on when the phone is ringing.

• “HT-L” LED (hot link): It is on when both TC1912 are set to FXS. It is off when one side is FXS and the other side is FXO. It will flash when both units are set to FXO and the alarm will turn on. “CH-S” LED (Interface status): It will flash when the Interface (FXS/FXO/Analog) is not setting up properly. It is on normally.

Dip-Switch Functions

• FXO/FXS: Sets up the unit as FXO (down position) or FXS (up position). These DIP switches will be preset by Factory. Do not change.
  NOTE: If the TC1912 is configured for 600 Ohm analog: This DIP switch is ignored.

• MSTR/SLVE: Set the unit as Master (down position) or Slave (up position).

• DHCP: Not used.

• ECHO CNCL: Turn on (down position) the Echo Cancellation option.

• CP-R 16K/32K: For future release.

• DISALM: Disable (down position) the Alarm. “Alarm” LED will still flash during the “alarm on” condition. However, the buzzer will be off and the dry contact will be open.

• RG   TST: Ring Test. Ring the phone when the unit is setup as FXS

• DFLT: Default. When set (down position,) the unit will restore the default IP address, Subnet Mask, username and password after the power is reset. It is used during the initial setup or the IP address is lost.

If the Saved Settings equal the Default Settings, “SW CTR” LED will be on. To properly restore the default IP settings, please follow the following steps:

For Master:

1. Power off the unit.
2. Set the “DFLT” and “MASTER” switches to On (down) position.
3. Power up the unit and wait for 2 seconds.
4. Set the “DFLT” switch back to Off (up) position.

Master IP: 192.168.254.123 Subnet Mask: 255.255.255.0 Username: user Password: password

For Slave:

1. Power off the unit.
2. Set the “DFLT” to On (down) position and “MASTER” to Off (up) position.
3. Power up the unit and wait for 2 seconds.
4. Set the “DFLT” switch back to Off (up) position.

Slave IP: 192.168.254.124 Subnet Mask:: 255.255.255.0 Username: user Password: password

Rear Panel.

• RJ-11 Connector for “Phone/Line”:
  For FXO, use a regular phone wire to connect to the local phone network such as phone line from Telco or PBX phone line.
  For FXS, use a regular phone wire to connect to a conventional (2-wire) telephone.
  Use this RJ-11 port to connect the two or four wire 600 Ohm analog signal.

• RJ-45 Connector for “10/100 Base-T Ethernet”
  Connect this port using a twisted pair Ethernet cable to the local network.

• Dry Contact Relay Terminal Blocks:.
  The Dry Contact Relay is normally in “Open” position. It will force the relay to “Close” position under the following conditions:

  • Major Alarm is on (e.g. Ethernet signal lost). This function can be disabled by setting the front panel “DISALM” switch to on (down) position.
  • Ringing signal is received. This function can be disabled by an internal DIP switch.
  • The dry contact relay will close during power up.

Chapter 2 – Application Diagrams

Application Example 1: Hotlink Phone via Ethernet
The TC1912 is intended to provide flexible point-to-point telephone service via Ethernet Networks. It is often used by maintenance or service personnel in Campus, Traffic Control, or Utility Substation Networks. By connecting two TC1912’s as shown below and using regular telephone sets, the users at both sides of the Ethernet link can have a hotlink phone line setup. When one user lifts up the handset, the remote side phone will start to ring. When remote side user picks up the handset, the phone will stop ringing and the conversation begins. When conversation is over, any user can terminate the phone link.

Figure 3. Typical Application Using TC1912s to Provide a Hotlink Phone Service in a Substation Environment.

Application Example 2: Phone line Extension via Ethernet.
This application is to extend a dial-up phone line via existing Ethernet as shown in the following diagram. By connecting a TC1912 to a regular dial-up phone line, the users at the remote end can dial to the outside phone network just like regular telephone line extended.

Figure 4. Typical application using TC1912s to extend a telephone line via an Ethernet LAN.

Chapter 3 – Installation

Unpacking the Unit.
Before unpacking any equipment, inspect all shipping containers for evidence of external damage caused during transportation. The equipment should also be inspected for damage after it is removed from the container(s). Claims concerning shipping damage should be made directly to the pertinent shipping agencies. Any discrepancies should be reported immediately to TC Communications’ Customer Service Department.

Equipment Location
The TC1912 should be located in an area that provides adequate light, work space, and ventilation. Avoid locating it next to any equipment that may produce electrical interference or strong magnetic fields, such as elevator shafts or heavy duty power supplies. As with any electronic equipment, keep the unit from excessive moisture, heat, vibration, and freezing temperatures.

Power Supply
Each TC1912 unit is powered via a rear panel’s terminal block connector. There are two pairs of terminal block connectors (“PWR A” and “PWR B”) for power redundancy, the power LEDs on the front panel will light according to which power jack(s) is/are connected. The power is 12 VDC @500mA, (24 VDC and AC 90 VAC to 240 VAC are optional).

Electrical Signal Connection
The RJ-45 & RJ-11 female connectors for the electrical signals are located on the rear panel.

DIP Switch Setting
TC1912’s need to work in pairs in an Ethernet network. One unit needs to be set to Master “MSTR” and the other one needs to be set to Slave “SLVE” using the front panel DIP switch. If the TC1912 pair is separated by a firewall, the Master unit should be the one sitting outside of the firewall. (Please refer to pg. 7 “Dip-Switch Functions” for setting the unit to default setting.)
All units come with default Slave settings, please refer to the “Quick Start/Test” section on pg. 17 for simple setup examples.
Note: The TC1912 FXS configured unit(s) will ring the phone channel during initialization, and the phone set connected on the FXS channel should ring within 10 seconds after power up.

For Slave:

• Default IP: 192.168.254.124
• Default Netmask: 255.255.255.0
• Default Username: user
• Default Password: password

For Master:

• Default IP: 192.168.254.123
• Default Netmask: 255.255.255.0
• Default Username: user
• Default Password: password

TC1912 Configuration
Web Base Interface Connection Home Page

1. Connect the computer and TC1912 on the same Ethernet switch.
2. Power up the unit and the “LINK” LED should be on. (You can disable the alarm by setting the “DISALM” to down(on) position.)
3. Start your Web browser.
4. In the Address box, enter the IP address of the TC1912. For example, if the unit is set to default Slave, enter: http://192.168.254.124
   If the unit is set to default Master, enter: http://192.168.254.123

If you are being asked for a username and password on any of the pages, use the following: Default user name: user
Default password: password

Figure 5. TC1912 Password Dialog

Home Page
Once connected, you should see the “Current Status” screen, as on Figure 6. (Please refer to “Testing & Trouble shooting” section, if not connected).
Click the links at the left of the page to navigate to the desired section.

Figure 6. TC1912 Home Page

Access Setting
You can change the user name and password by clicking on the link “Access” at the home page.

Figure 7. TC1912 Access Setting page

Click the “Undo” button or browser’s “Back” button to cancel all the changes. Click the “Save” button to save the changes.

Network Settings
Click on the “Network” Link at the home page and you should see the following screen.

Figure 8. TC1912 Network Settings Page

(Note: Please contact your local network administrator for your network settings.) Local Unit Description (optional): Enter the description for the local unit.

• IP Address:
  • Unit’s IP Address. The default IP Address for master is 192.168.254.123, and the default IP Address for slave is 192.168.254.124.
  • If you change the IP Address, you must reconnect using the new IP Address. If you are using the DHCP option, this value will be set automatically.
• Subnet Mask:
  • This indicates the TCP/IP network class you are using.
  • The default Subnet Mask is 255.255.255.0. If you are using the DHCP option, this value will be set automatically.
• UDP Port: This is the UDP port number which the TC1912 units will attempt connections. Default value is 1912. (Range: 1-65535).
• Gateway IP Address: If your connection contain a router, enter the IP Address of the Router (LAN side.)
• Default value is 0.0.0.0
• DNS IP Address: If you need to connect outside of your LAN, enter the DNS IP address here.
• Default value is 0.0.0.0
• Click the “Undo” button or browser’s “Back” button to cancel all the changes
• Click the “Save” button to save the changes
• Remote Unit Description (optional): Enter the description for the remote unit.
• Remote IP Address: (not required for master unit.) For Slave unit, this is the IP Address of the remote
• Master. (It is recommended that user enter the remote Slave IP address here for the master unit for future reference.)
• The default remote IP Address for master is 192.168.254.124, and the default remote IP Address for slave is 192.168.254.123.

Electrical Analog Signal Interface Connections & Pin Assignments for 2/4 Wire
The RJ-11 connector is located at the rear panel of the TC1912.
For four wire analog signals:
Pin 5 is transmit TIP & pin 2 is transmit RING.
Pin 4 is receive TIP & pin 3 is receive RING.

Figure 9. Four Wire Analog Pin Assignments & Connection Diagram.

For two wire analog signals:
Pin 4 is the TIP & pin 3 is the RING.

Figure 10. Two Wire Analog Pin Assignments & Connection Diagram.

Chapter 4 – Testing & Troubleshooting

Quick Start/Test (Hot Link using an Ethernet Switch/Hub)
Typically, most problems encountered with the TC1912 are related to network settings. To ensure the units are working properly, the following section will show you how to test the functionality of a TC1912 pair without any network settings. Equipment:

1. One 100/1000 Ethernet Switch/Hub or use the supplied Cross Over Cable(for testing purpose only), see next page.

2. Two TC1912 units.
   For “Hotlink” tests, both of the units must be configured as FXS.
   For “Phone Line Extension” tests, one unit must be configured as an FXO and the other as FXS.

3. Two regular analog telephone sets.

4. Two telephone wires and two Ethernet cables.
   Connect both TC1912 units to the Ethernet Switch and connect a phone to both units. Make sure the Ethernet switch is not connected to anything except the power and the TC1912s.

Figure 11. TC1912 Quick Test (Hot Link using an Ethernet Switch/Hub)

Unit A (Master)
Make sure the power of the unit is off. Set the “MSTR” and “DFLT” DIP switches on the front panel to the on (down) position. (All other switches are set to off (up) position.)

Unit B (Slave)
Make sure the power of the unit is off. Set the “DFLT” DIP switch on the front panel to the on (down) position. (All other switches are set to off (up) position.)
Power up and set the “DFLT” DIP switch back to off (up) position on both units.
The communication link between the master and slave should establish automatically within 15 secs, and no LEDs should be flashing (it is normal for the “ACT” LED to turn on occasionally.) When one side picks up the handset, the other side should ring. When both of the handsets are off hook, the  voice should go through in both directions and can be heard on either end of the handsets

If an Ethernet Switch is not available, you can replace the Switch with the supplied cross over cable as shown below. Follow the same procedures as shown on page 17, Quick Start/Test for Unit A (Master) and Unit B  (Slave).

Figure 12. TC1912 Quick Test (Hot Link using a Cross Over Cable)

Testing & Troubleshooting continue
To test the Phone line Extension function, Simply do the following: (Power off is not needed)

• Unit A: (Assuming FXO unit is odered).
  Set the “FXO” DIP Switch to on (down) position.
  Connect a phone line between the TC1912 and the wall jack.

• Unit B: No Change

Figure 13. TC1912 Quick Test (Phone line Extension)

When handset at Unit B is picked up, the user should hear the dial tone and be able to dial to the outside phone network just like regular telephone line extended.

Chapter 5- Specification

Audio Bandwidth

• Telephone and Analog ……………………………………………………………. 300Hz to 3.4Khz
• Ethernet Bandwidth………………………………………………………………………………………………………… 113K bps

Electrical

• Phone Connector ………………………………………………………….. RJ-11 Female (2-wire)
• Ring voltage ……………………………………………………………………………. 80Vrms at 20Hz
• FXO Input Impedance ………………………………………………………………………… 600 Ohm
• FXS output Impedance ………………………………………………………………………. 600 Ohm
• Ethernet …………………………………………………………………………………….. RJ-45 Female
• Ethernet speed …………………………………………………………………………….. 10/1 00Mbps

Alarm/Ring

• Dry Contact ……………………………………………………………………………….. Normal OPEN

Indicators

• System status ………………………………………. ALARM, PWR A, PWR B, VccA, VccB
• Telephone Signal Status Tx and Rx Volume, Off-hook, FXO, FXS, Ring, Hot Link
• Ethernet Signal Status ……………………… Sync, Link Status, Activity, Master/Slave

Power Source

• Standard ……………………………………………………………………………….. 12VDC @500mA
• Optional …………………………… 24VDC, or 115/230VAC with an external power cube

Temperature

• Operating ………………………………………………………………………………………. 0°C to 50°C
• Hi-Temp Version (optional) …………………………………………………………. -20°C to 70°C
• Storage ………………………………………………………………………………………. -40°C to 90°C
• Humidity …………………………………………………………………………. 95% non-condensing

Physical (Standalone/Wallmount unit)

• Height ……………………………………………………………………………………….. (3.53 cm) 1.4″
• Width ……………………………………………………………………………………….. (18.14 cm) 7.1″
• Depth ………………………………………………………………………………………. (24.89 cm) 9.8″
• Weight ………………………………………………………………………………… (835 gm) 1.85 Lbs

Appendix

Return Policy
To return a product, you must first obtain a Return Material Authorization number from the Customer Service Department. If the product’s warranty has expired, you will need to provide a purchase order to authorize the repair. When returning a product for a suspected failure, please provide a description of the problem and any results of diagnostic tests that have been conducted.

Warrnty
All products manufactured by TC Communications, Inc. come with a five year (beginning 1-1-02) warranty. TC Communications, Inc. warrants to the Buyer that all goods sold will perform in accordance with the applicable data sheets, drawings or written specifications. It also warrants that, at the time of sale, the goods will be free from defects in material or workmanship. This warranty shall apply for a period of five years from the date of shipment, unless goods have been subject to misuse, neglect, altered or destroyed serial number labels, accidents (damages caused in whole or in part to accident, lightning, power surge, floods, fires, earthquakes, natural disasters, or Acts of God.), improper installation or maintenance, or alteration or repair by anyone other than Seller or its authorized representative.
Buyer should notify TC Communications, Inc. promptly in writing of any claim based upon warranty, and TC Communications, Inc., at its option, may first inspect such goods at the premises of the Buyer, or may give written authorization to Buyer to return the goods to TC Communications, Inc., transportation charges prepaid, for examination by TC Communications, Inc. Buyer shall bear the risk of loss until all goods authorized to be returned are delivered to TC Communications, Inc. TC Communications, Inc. shall not be liable for any inspection, packing or labor costs in connection with the return of goods.
In the event that TC Communications, Inc. breaches its obligation of warranty, the sole and exclusive remedy of the Buyer is limited to replacement, repair or credit of the purchase price, at TC Communications, Inc.’s option.
To return a product, you must first obtain a Return Material Authorization (RMA) number and RMA form from the Customer Service Department. If the product’s warranty has expired, you will need to provide a purchase order to authorize the repair. When returning a product for a suspected failure, please fill out RMA form provided with a description of the problem(s) and any results of diagnostic tests that have been conducted. The shipping expense to TC Communications should be prepaid. The product should be properly packaged and insured. After the product is repaired, TC Communications will ship the product back to the shipper at TC’s cost to U.S. domestic destinations. (Foreign customers are responsible for all shipping costs, duties and taxes [both ways]. We will reject any packages with airway bill indicating TC communications is responsible for Duties and Taxes. To avoid Customs Duties and Taxes, please include proper documents indicating the product(s) are returned for repair/retest).

Limitation Of liability
In no event shall the total liability of TC Communications, Inc. to purchaser and/or end user for all damages including but not limited to compensatory, consequential and punitive damages, exceed the total amount paid to TC Communications, Inc. by purchaser for the goods from which the claim arose, in no event shall TC Communications, Inc. be responsible for indirect and consequential damages.
Continue on next page.
In no event shall liability attached to TC Communications, Inc. unless notice in writing is given to TC Communications, Inc. within ten days of the occurrence of the event giving rise to such claim.
TC Communications, Inc. shall not be responsible for delays or non-deliveries directly or indirectly resulting from or contributed to by foreign or domestic embargoes, seizure, fire, flood, explosion, strike, act of God, vandalism, insurrection, riot, war, or the adoption or enactment of any law, ordinances, regulation, or ruling or order or any other cause beyond the control of TC Communications, Inc.
TC Communications, Inc. shall not be responsible for loss or damage in transit and any claims for such loss or damage shall be filed by the purchaser with the carrier.

References

• TC Communications - Fiber Optic Networks and Industrial Ethernet Solutions

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