for huawei, purchasing 3com is a stepping stone for american market. in terms of technologies (data) , huawei is way ahead of 3com.
but hawei would not be very successful in us market (data). in terms of data, juniper is a leader in technologies, market leader for telecom, cisco is a leader for enterprises market. huawei products (data) is quite stable but not operational friendly. its support is way behind juniper and cisco.