The Juniper ACX series is designed primarily for service provider edge and mobile backhaul. The ACX2000; ACX2200 ACX1100 are the cell site or customer site routers. The ACX5000 series are the aggregation or hub site devices.
Cisco backhaul devices are from the ASR series.
http://www.cisco.com/c/en/us/solutions/service-provider/unified-ran-backhaul/index.html
The Juniper EX series are ethernet core, aggregation and endpoint switches. The EX4200 can be end user or aggregation and the EX4500 is generally a core or aggregation device. Depending on where you were deploying the switches you would be using either the Nexus or Catalyst series devices in the Cisco portfolio.