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ISDN NETWORK TERMINATION - NT 1

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Telenet’s ISDN Network Termination for basic rate access is the main gate to the world of ISDN. It enables subscribers to use services such as high-speed transmission of data, text and video signals in digital format over an access line in addition to voice transmission. It is a link between the subscriber line (U Interface) and the user Interface to the network (S/T interface). A maximum of 8 terminal units can be connected to the S/T interface. The digital transmission format used offers the subscriber the possibility of access to two independent Basic Channels (B Channels) each with 64 Kbit/s and one 16 Kbit/s Signaling Channel (D), to be transmitted. The terminals connected to S/T for any two ISDN services can use both B channels simultaneously. The associated Signaling information and various service features are transmitted over the D Channel. This result in a Transmission speed of 144 Kbits/s for both transmits and receives direction. The NT1 is installed at the end of the public transmission line coming from the ISDN switch of the local exchange and converts the 2-wire duplex U interface into the 4wire double simplex subscriber S/T interface. Features:   Up to 8 access sockets can be connected to the S/T interface via a 4-wire bus. Two services like telephony and Data transmission can operate simultaneously. Data rate of 144 Kbps is available to the customer at the S/T interface. It has three bus configurations, which have different coverage ranges. Point to Point. Point-to-Multipoint: Short passive bus. Point-to-Multipoint: Extended passive bus. Has four operating modes depending on whether transmission is active or inactive and whether the integrated power supply is working or not Echo cancellation at the U interface ensures that Data Signals are transmitted bidirectionally. The interface modules operate in the automatic mode. The U interface module recovers clock synchronization signal, monitor transmission errors and initiate appropriate actions. In the event of a long-term short circuit, the power supply module is auto switched off and resumes operation automatically with only a delay of few seconds. The design is in compliance with ITU/CCITT/ANSI/ETSI and industry standard 2B1Q line code for the Uinterface. It is easy to install at the user’s premises and can be installed in a wall-mounted cabinet or used as a desktop version. Testing and operation configurations can be adjusted quickly by means of switches and jumpers. The technical data of the NT1 is as under   U-INTERFACE Transmission method 2 Wire full duplex interface using echo cancellation   Allowable attenuation > 42 db at 40 KHz   Line Code 2B1Q   Subscriber Line Connection 8 pin jack (RJ-45)   Voltage at U-Interface 120 V (max)           S/T-INTERFACE Transmission method 4 wire duplex transmission   Range Point to point up to 1000m   Short passive bus   up to 150m up to 8 T E’ S   Extended passive bus   up to 500m up to 4 T E’ S   Interface connector for S/T   RJ-45 x 2 230 V AC   Power Supports Remote powering in absence of local power   Test function Supports loop back commands from the switch  

ISDN PRI Modems

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• Connectivity Type: Wireless or Wi-Fi
• Current: 5.4A
• Material: Mild Steel
• Temperature: 25 Degree C
• IP Rating: IP55
• Number Of Ports: 16

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