What E1 cables does AR1200 use

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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.

Other related questions:
How to AR routers support E1/T1 cards
E1/T1 cards that AR routers support are described as follows: 1. 1E1T1-M/2E1T1-M/4E1T1-M/8E1T1-M equipped with 1 interface or /2/4/8 interfaces support the switching use of E1 and T1. Cards equipped with 4 or 8 interfaces do not support T1 currently. - Cards equipped with 1 interface or 2 interfaces use the DB9 female connector interface and support E1/CE1/CT1/PRI(E1&T1) modes. - Cards equipped with 4/8 interfaces use the RJ45 interface and support E1/CE1/PRI(E1) modes. 2. 1E1T1-F/2E1T1-F/4E1T1-F/8E1T1-F equipped with 1 interface or /2/4/8 interfaces support the switching use of E1 and T1. Cards equipped with 4 or 8 interfaces do not support T1 currently. - Cards equipped with 1 interface or 2 interfaces use the DB9 female connector interface and support E1 (framed and unframed) and T1 modes. - Cards equipped with 4/8 interfaces use the RJ45 interface and support E1 (framed and unframed) mode. 3. 4E1-IMA, which is used on ATM networks, demultiplexes an aggregate ATM cell flow into multiple lower-speed E1 links, and multiplexes the E1 links on the far end to restore the original aggregate ATM cell flow.

How to connect the E1 interface of an AR router to other devices using cables
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.

How to extend the E1 cables used by AR routers
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.

Can AR2240 use Cisco V35 serial port cables
Console cables follow the same standard and can be replaced in general. However, the appearance and implementation method of serial port cables may vary with manufacturers. Use E1 serial ports cables of corresponding manufacturers to ensure stable data transmission.

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.

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