Connector of the 75-ohm E1 trunk cable on the MA5616


Connector of the 75-ohm E1 trunk cable on the MA5616: DB44 connector

Other related questions:
What E1 cables does AR1200 use
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.

How to convert the U1900 E1 cable from 75-ohm to 120-ohm?
For details, see chapter 7 "Connecting the Signal Cables" in the eSpace U1980 V200R003C00 Quick Installation Guide .

How to connect the U1900 E1 trunk cables?
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.

Can the U1980 use the 120-ohm balanced E1 cable
The U1980 supports 120-ohm balanced E1 cable access. If the cable is a 75-ohm unbalanced one, use the transfer box to convert 75-ohm unbalanced E1 signals into 120-ohm balanced E1 signals so as to meet the requirements for interconnection using the E1 trunk.

What is the resistance of the U1981 BNC connector?
75 ohm.

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