M0201ABK_uc ERA® WCS and e-POI Subracks and Power Supply Unit Installation Guide
© June 2021 CommScope, Inc. Page 59
Install and Connect the Subrack Cards
2 If the signal levels of the BTS exceed the maximum input level of + 16 dBm, an e-POI Module or other
suitable attenuator must be used to attenuate the signal. For optimum PIM performance, the composite
level into a Donor (RFD Card) port should be less than 16 dBm. If only one carrier is in a band, PIM is
probably not a concern. For the case of two or more carriers in a band, spurious intermods due to PIM
could land in the UL causing interference. Whether or not PIM will cause interference depends on the
spacing between UL and DL and the frequencies of active carriers.
NOTE: This graphic shows a current RFD Card. Older RFD Cards (PN 7633229-00, PN 7633229-01)
have an LCD window and DISPLAY buon.
LTE 2x2 MIMO (AP0 or AP1)
to/from
BTS/eNodeB or e-POI
LTE 2x2 MIMO (AP0 or AP1)
to/from
BTS/eNodeB or e-POI
DL ULDL UL
Ports set to Simplex
LTE MIMO 4x4 All Paths (AP0, AP1, AP2, AP3)
to/from
BTS/eNodeB or e-POI
Ports set to Duplex
LTE MIMO 2x2 (AP0, AP1)
to/from
BTS/eNodeB or e-POI
Ports set to Duplex
LTE MIMO 2x2 (AP0, AP1)
to/from
BTS/eNodeB or e-POI
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