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Nomus Gateway e Series

Manageable xDSL DTUs and Converters

The Nomus Gateway e Series consists of various manageable modems and convertors. It is an intelligent new concept where you can mix and match from a selection of interface cards and order a product to match the application, other networking components and the available WAN links. The interface cards available include V.35/RS530/X.21 interface, G.703/E1 interface or the co-directional G.703 interface card.

All Gateway e Series products can be managed through the Ethernet port with built-in HTTP & Telnet Agents or the optional SNMP agent. The configuration, monitoring and diagnostics can be performed from either the PC connected to the Ethernet Port or any Standard SNMP management software installed in the network. Besides, simple DIP switches and Loopback switches or optional LCD and configuration switches are provided for easy and fast configuration and diagnostics. A bank of LEDs provides comprehensive status indication.

The Gateway e SHDSL modem operates to a distance of upto 6.5 Km on a 2-wire 0.5 mm copper cable at 2 Mbps and up to 10.5 Km at lower speeds. It uses TCPAM modulation to automatically negotiate the most optimum speed as per the distance and quality of the cable. It can also operate on a 4-wire circuit to increase the driving distance. It also supports use of intermediate SHDSL repeaters to increase the distance.

The Nomus Gateway e modem can be equipped with the following interface cards:

1. Serial V.35                                  : Typically used to connect to user equipment such as Routers
2. G.703/E1 (Nx64 Kbps)               : Typically used to connect to the PCM network in the CO/Exchange
3. G.703/Co-directional (64 Kbps)  : Typically used to connect to the PCM mux in the CO/Exchange for 64 Kbps Leased lines
4. Dual G.703/E1+64 Kbps Co-dir  : Either of the interfaces can be used to connect to the PCM circuit at the CO / Exchange for Nx64 Kbps or 64 Kbps operation

Both V.35 and G.703/E1 interfaces can be provided in the Gateway e for flexibility in installation or optionally to combine the user traffic of both V.35 and E1 over the SHDSL link so as to share the same link for both data & voice. Both interfaces can also be used as a V.35 to G.703 interface converter for use where the user equipment like Router is in the Exchange or within 1 Km distance.

GW e Table

Performance and Reliability are the hallmarks of all Nomus products and these products are no exceptions. They provide high immunity to background noise on DOT lines allowing multiple Data channels on the same physical cable. They have extra protection against power fluctuations by using Switched Mode Power Supply – SMPS and the convenience of a built-in (internal) Dual AC/DC power supply. A field replaceable multi-stage line protection circuit consisting of Sidactors, GDTs, PTCs and Resettable Telecom Fuses protects the units against telephone line surges while meeting the ITU K.20/21 requirements. It can thus meet the tough demands of the Indian environment and you are assured of reliability, productivity, quality and value.

Application Diagram 

Gateway e DTU Big



  • Meet G.991.2 Standard with TCPAM Coding.
  • 2-Wire Leased Line operation with option for double data rates or greater range
  • Data Rates of nx64 Kbps upto 2,048 Kbps on 2-Wire or 4,096 Kbps on 4-Wire
  • Range over 6 Km on a single 0.5mm (24 AWG) twisted copper cable pair or 7.5 Km on two pairs at 2 Mbps. Exceeds 10 Km at lower speeds.
  • Supports SHDSL Repeaters for higher range
  • Embedded Channel for Supervision

G.703/704 E1 Interfaces:

  • Compatible with Framed & Unframed E1 signal on G.703 interface.
  • 120 Ohms Balanced (RJ45) or 75 Ohms Unbalanced (BNC)
  • Transmit timing based on External (G.703), Internal or Recovered from xDSL.

V.35 Interface:

  • 34 PIN Connector
  • Support for Internal, External (V.35) or Recovered from xDSL


Front Panel Diagnostic Switches & LEDS with 16×2 LCD Option
Convenient Quick Config DIP Switches
Ethernet port for Configuration, Status Monitoring & Diagnostics from a PC using HTTP/Telnet/SNMP
Online Performance Monitoring as per ITU-T G.826 with Attenuation, NMR/SNR, CRC Errors, etc.
Local, Digital and Remote Loop-Backs
Built-in AC & DC Dual Mode Power Supply
Protection against Line Surges as per ITU-T K.20/21
Compact Desktop cabinet or Rack Mount option