E1 cable interface type of OSN2500

Methods of connecting the E1 interface of an AR router to other devices using cables are described as follows: Devices of operators provide the BNC connector in general while AR routers provide the DB9 female connector (cards with 1 interface or 2 interfaces) or the RJ45 connector (cards with 4 or 8 interfaces). The connection methods are as follows: - BNC connectors of operators' devices -- connectors of coaxial cables -- (BNC connector on the customer end -- E1 cables -- DB9 male connectors) -- DB9 female connectors of routers - BNC connectors of operators' devices -- connectors of coaxial cables -- (BNC connector on the customer end -- E1 cables -- RJ45 connectors) -- RJ45 connectors of routers Cables with BNC and DB9/RJ45 connectors are used.

E1 cables used by AR routers and the line orders of the cables are described as follows: E1 cables include DB9-BNC cables and RJ45-BNC cables. The impedance of the cables can be 75 ohms, 120 ohms, and 100 ohms. Note: You are not advised to make E1 cables by yourself. 1. DB9-BNC cables: (apply to E1 cards with one interface or two interfaces) DB9 pin1---Rx+Signal---BNC1 core wire (Rx) DB9 pin2---Rx-Signal---BNC1 insulated wire (GND) DB9 pin6---Tx+Signal---BNC1 core wire (Tx) DB9 pin7---Tx-Signal---BNC1 insulated wire (GND) 2. RJ45-BNC cables: (apply to E1 cards with four and eight interfaces) RJ45 pin1---Rx-Signal---BNC1 core wire (Rx) RJ45 pin2---Rx+Signal---BNC1 insulated wire (GND) RJ45 pin4---Tx-Signal---BNC1 core wire (Tx) RJ45 pin5---Tx+Signal---BNC1 insulated wire (GND) 3. Pin definition: Assume that a DB9 connector is put in a method that the wider end is at the top, Pin 1 to Pin 9 of the connector are defined in a sequence from left to right and from top to bottom. Assume that an RJ45 connector is laid flat, Pin 1 to Pin 8 of the RJ45 connector are defined in a sequence from left to right when you face to the front of the connector.

The length of a 75-ohm DB9-BNC E1 cable is 3 m by default. If the cable is not long enough for connection, you can use 75-ohm trunk cables (15 m) to extend the cable.

Each E1 link consists of two E1 lines, one for receiving and the other for transmitting data. Connect the Tx and Rx ends of the E1 cable respectively to the Rx and Tx ends of the peer E1 cable.

There are two types of U1900 E1 cables: RX and TX. The RX cable receives signals and the TX cable transmit signals.