4 ports FXO/FXS over E1 PCM multiplexer
4 voices over E1 Fiber optical Multiplexer
4 ports FXO/FXS over E1PCM Multiplexer
4 ports E&M over E1 PCM multiplexer
4 voices over E1 Fiber optical Multiplexer
4 ports FXO/FXS over E1PCM Multiplexer
4 ports E&M over E1 PCM multiplexer