Table 7-7 Filter Resources Allocation (Up To 5 Mhz Wide), Example - CommScope Node AM4 Manual

7. Specifications
Detailed System Description – Dual-Band Cards
With the increasing demand for mobile communication, additional radio frequency (RF)
bands are globally assigned to meet that demand. In addition, better utilization of the
radio spectrum is being addressed by Multiple-In Multiple-Out (MIMO) antenna
technology and techniques. However, basically all measures to increase the
communication link capacity result in an increased number of parallel operated radio front
ends. In response to this trend, CommScope has enhanced the radio band capacity of its
existing Node AM platform by providing Dual Band RF cards. Following a software
upgrade, two medium power RF front ends can be operated in the same space of a legacy
single band plug-in module.
Thanks to the on-card digital signal processing functionality, up to 32 filter resources (0.2
... 5 MHz each) are available per dual card. Depending on the upgrade goal, i.e.
increasing the number of RF bands or MIMO performance, dual band RF cards for inter-
band, e.g. 8/9 or 18/21, combination are available.
When using CommScope's Node AM chassis in situations where the sub-band
bandwidths are greater than 5 MHz and where the sub-bands are defined by a start and
stop frequency, the filter resources are grouped together, without phase or amplitude
ripple. The total number of used filter resources per dual band card is determined by
adding the number of filter resources required for each sub-band in both RF bands
together. For example, if there are three sub-bands with 200 kHz for the first sub-band
and 10 MHz for the second sub-band in the 1800 MHz band and 20 MHz for the third sub-
band in the 2100 MHz band then one filter resource is needed in the first, two in the
second, and four in the third sub-band. The total number of filter resources used is seven.
Example of filter resources allocation (up to 5 MHz wide):

table 7-7 Filter resources allocation (up to 5 MHz wide), example

Page 76 MF0121ACP_uc.docx Manual for Node AM4