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.

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