The Spectrum Business eMTA DOCSIS D3.1 Advanced Voice Modem is a versatile device designed for both internet and voice services, offering advanced features and robust connectivity for business environments.
Function Description:
This device serves as an eMTA (Embedded Multimedia Terminal Adapter) and a DOCSIS 3.1 Advanced Voice Modem. It facilitates high-speed internet access and provides telephone service by connecting analog telephones. It supports both DOCSIS 3.1 and earlier standards (3.0, 2.0, 1.1, 1.0), ensuring broad compatibility with cable networks. The modem is equipped with multiple voice ports, allowing for the connection of several telephones. It also includes an Ethernet port for connecting to a wireless router or other Ethernet-enabled devices, enabling local network connectivity. An internal battery provides backup power for up to 8 hours, ensuring continuity of service during power outages.
Important Technical Specifications:
Interfaces & Standards:
- Cable: F-Connector, female
- Models: EU4251, ES4251
- LAN: One 10/100/2.5 Gbps RJ-45 port
- Telephony: 4 RJ-11 ports
- PacketCable: 1.5 (NCS) or 2.0 (IMS/SIP) compatible
- DOCSIS: 3.1 certified
Downstream (Actual speeds may vary based on factors including network configuration and connected devices):
- Frequency Range: 258MHz-1218MHz
- Capture Bandwidth: 1.218GHz
- Modulation: 64 or 256 QAM and OFDM: up to 4096 QAM
- Maximum DOCSIS 3.1 Data Rate: 2 x 192MHz OFDM channels provide capacity up to 5Gbps
- Maximum DOCSIS 3.0 Data Rate: 32 downstream channels provide speeds up to 1372Mbps
- Symbol Rate: 5361 Ksps
- RF (cable) Input Power: -15 to +15dBmV (64/256 QAM), -6 to +15dBmV (4096 QAM)
- Input Impedance: 75 Ω
Upstream (Actual speeds may vary based on factors including network configuration and connected devices):
- Frequency Range: 5MHz ~ 42MHz/85MHz switchable
- Modulation: QPSK or 8/16/32/64/128 QAM and OFDMA: up to 4096 QAM
- Maximum DOCSIS 3.1 Data Rate: 2 x 96MHz OFDMA channels provide capacity up to 2Gbps
- Maximum DOCSIS 3.0 Data Rate: 8 upstream channels provide speeds up to 246Mbps
- Symbol Rate: 160, 320, 640, 1280, 2560, 5120 Ksps
- RF (cable) Output Power: A-TDMA/S-CDMA (one channel): +65dBmV, OFDMA: +65dBmV
Security:
- DOS (denial of service) attack protection
Regulatory:
- UL/FCC Class B, Energy Star Certified
Voice:
- PacketCable: 1.5 (NCS) or 2.0 (IMS/SIP) compatible
- Line Voltage On-hook: -48 Volts
- Loop Current: 20mA/41mA
- Ring Capability: 2K ft., 5REN
- Hook State: Signaling Loop Start
- Features: DTMF Tone Detection, T.38 Fax Relay (G.711), Echo Cancellation (G.168) / Silence Suppression, Voice Active Detection and Comfort Noise Generation
- Codec: G.722 codec, WB SLIC
Physical and Environmental:
- Dimensions: 75mm (W) x 256mm (H) x 183.6mm (D) / 2.95 inches (W) x 10.07 inches (H) x 7.22 inches (D)
- Weight: 632.6g (1.4 lbs), unit only
- Power: 12V 2A (output), 100-240VAC, 50-60Hz, 1A Max (input), external PSU
- Operating Temperature: 0°C ~ 40°C (32°F ~ 104°F)
- Humidity: 5 ~ 95% (non-condensing)
- Internal Battery: 8 Hour Battery
Usage Features:
The modem is designed for straightforward installation and operation.
- Connectivity: It connects to the cable wall outlet via a coaxial cable, to a wireless router or other Ethernet device via an RJ45 Ethernet cable, and to analog telephones via RJ-11 phone cables (Voice 1-4 ports). An ATA port is also available for additional voice hardware, though its availability may vary by market.
- Power: The device is powered by an external adapter, which plugs into a standard electrical outlet. The internal 8-hour battery provides essential backup power for voice services during outages.
- LED Indicators: The front panel features LED indicators for Status, Voice ports (1-4), and Battery, providing visual feedback on the device's operational state.
- Voice Status Light (Blue): Indicates voice service status (provisioned, active, cable connected/not connected, off-hook, unable to establish connection).
- Battery Status Light (Blue/Red): Shows battery charge level (On Blue for 21% or higher, On Red for 20% or lower, Flashing between On Red and Off for 10% or lower), charging status (Easing between On Blue and Off), or if no battery is installed (Off).
- Ethernet (Internet) Left Status Light (Green/Amber): Indicates Ethernet device connection speed (On Green for 100 Mbps, On Amber for 2500 Mbps (2.5G), Off for 100 Mbps).
- Ethernet (Internet) Right Status Light (Amber): Indicates data transfer activity (On Amber for data being passed, Off for no link established).
- Wall Mounting: The modem can be wall-mounted using an included kit, which includes a bracket, wall anchors, and screws. This allows for flexible placement and helps to keep the device secure and organized.
Maintenance Features:
- Reset Button: A multi-functional reset button on the front panel allows for two types of resets:
- Reboot (Power Cycle): Press and hold for 4 to 10 seconds to reboot the modem.
- Factory Reset: Press and hold for 10 seconds or more to restore the device to its factory default settings. This is useful for troubleshooting or reconfiguring the modem.
- LED Behavior for Reset: The LED indicators provide feedback during reset operations. Blue Easing indicates a successful connection, while Red Easing occurs if the device is offline. The ring and text illuminate when the button is pressed.
- Battery Backup: The internal 8-hour battery ensures that voice services remain operational during power interruptions, minimizing service downtime.
- Grounding Guidelines: The device manual reminds installers of the importance of proper grounding, specifically referencing section 820-93 of the National Electric Code, which specifies that the coaxial cable shield should be connected to the building's grounding system as close to the cable entry point as practical. This enhances safety and device longevity.
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