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2W/4W E&M 600 Ohm and Dry Contact over IP Gateway

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The TC3846-6 links or extends up to 4 channels of 600 ohm 2/4-wire analog and dry contacts across Layer 2/3 Ethernet/IP, CE, or MPLS networks. For cost savings and scalability, units can be ordered with only 1 or 2 channels of analog and dry contacts and later expanded in the field to 2 or 4 channels.

  • 1, 2, 4 channels (expandable) of 2W/4W E&M 600 ohm over IP
  • Uncompressed audio ensures flat audio response allowing crystal clear audio and 100% passing of in-band audio signaling
  • Extremely low latency ensures compatibility with all voting and simulcast systems
  • Compatible with all dispatch consoles
  • FSK, FFSK modem capability
  • Meets or exceeds IEC 61850-3, IEEE 1613 & NEMA TS-2 standards
  • Extreme operating temp (-40°C to +80°C) option
  • Built-In Temperature & Power Sensors
  • Member of JumboSwitch Product Family

How it's connected:

Here is a typical application radio system - simulcast with dispatch and voter

Analog & Dry Contact over IP with voter/comparator application

The JumboSwitch series is a TDM over IP/Ethernet based solution designed to emulate time-division multiplexing over packet switched networks (PSN). TDM over IP/Ethernet is a TDM pseudowire (PW) technology making it possible to provision E1, T1, E3, T3, STS-1 and serial data services across PSN's such as IP, MPLS or layer 2 Ethernet Networks.

"Over the past thirty-five years I have used similar boxes from other vendors for similar applications. But I have never seen one that would produce such a linear, uniform audio transmission from one end to the other - especially across an IP link."
- Martin T. Vinson, N.C.T., A.S.C.E.T.

Learn more about Enhanced Audio with Analog Radio Over IP

Frequently asked questions:

Q: How much network bandwidth is required for one audio channel?

A: Network bandwidth per channel ranges depending on settings, but at default settings it is 220Kbps per channel (the unit is set at latency mode 3, see chart below).

TC3846-6 Latency Table

Q: Is the full bandwidth required at all times or only when audio voice is present?

A: Yes, full bandwidth is required at all times. A link is opened and established for minimal latency and real-time communications.

Q: Is there any capability to compensate for network jitter?

A: Yes, the jitter buffer has 5 latency settings to compensate for packet delay variation (see latency chart above).

Q: Does it require, or can it make use of, network QoS?

A: Yes, it does make use of QoS and is recommended.

Q: Would it be suitable for operation over a cellular LTE router?

A: : In general, this is not recommended, particularly as a primary connection.


Radio system using Simulcast with dispatch and voter

A typical radio system in a simulcast voting network. Using a TC3846-6 at each of the remote sites, 4W from these sites are converted and sent back to dispatch through a packet-based network, then converted back to 4W to communicate with the voter and dispatch console. A single card at dispatch can communicate with up to 4 remote locations.

Typical radio system simulcast application

Broadcasting in a campus security or Public Address (PA) network

The TC3846-6 can also take 1 input and broadcast by cloning the signal over its other open ports, ideal for PA networks that are looking to migrate their transport to a packet-based network.

Animation: Broadcasting analog signals over IP

Broadcast or public address network application

Airport operations radio communications

Communications between the Digital Antenna System (DAS), air traffic control and weather operations buildings via an upgraded self-healing IP/Ethernet fiber optic ring.

Airport operations radio application

600 ohm analog audio devices

Compatible with FSK, FFSK modems

TC3846-6 - Analog and Dry Contact IP Gateway
Click to enlarge


Connection Capacity
  1. 600 ohm (2/4 Wire)1, 2, or 4 Ports
  2. Dry Contact1, 2, or 4 Ports
  3. GigabitEthernet1 Port
  1. Dry Contact Interface
  2. Normal openStandard
  3. Normal closeOptional
  4. Max Load Voltage60V
  5. Continuous load current0.55A
  6. Peak load current1.2A
  7. Detector max input voltage9V
  8. 600 ohm Analog Interface
  9. Impedance600Ω
  10. Max Input3Vp-p
  11. Frequency band300 to 3400Hz
  12. ConnectorRJ11
  13. Ethernet Interface
  14. StandardsIEEE 802.3, 802.3u
  15. ConnectorRJ45
  16. Console Interface
  17. Connector2.5mm Audio Jack
Regulatory Approval
  1. CE, FCC Part 15, CISPR (EN55022) CLASS A, IEC 61850-3, IEEE 1613, NEMA TS-2
Diagnostic Functions
  1. Local and Remote Loopback for Analog and Dry Contact
  1. Unit StatusPWR (A, B), Alarm, BU, PL, Vcc, BP, MGM
  2. AnalogOn, Sync
  3. Dry ContactDetector, Relay
  1. Standard12VDC
  2. Optional24VDC, -48VDC or 125VDC (1U/ 2U/ 4U only), 90-260 VAC, 50/60Hz
  3. Power Consumption< 10W
Operating Temperature
  1. Hi-Temp-20°C to 70°C
  2. Extreme Temp-40°C to 80°C
  1. Temperature-40°C to 90°C
  2. Humidity95% non-condensing
Physical (4-Channel Standalone)
  1. Height(3.15 cm) 1.24"
  2. Width(17.78 cm) 7.0"
  3. Depth(22.86 cm) 9.0"
  4. Weight(0.3 kg) 0.75 lbs


For more information

For assistance with this product or to request a user manual please contact Technical Support.