M0201ABK_uc ERA® WCS and e-POI Subracks and Power Supply Unit Installation Guide
© June 2021 CommScope, Inc. Page 37
Power Supply Unit Subrack and Rectifier Modules
Maximum Number of APs that can be Powered by WCS Subrack
This section shows how to calculate the maximum number of UAPs or Copper CAP Ls that can be powered for
specific WCS Subrack configurations. Note: -48Vdc WCS Subracks ID 7844067-xx, 7844068-xx do not provide
Power over CAT6A to support UAPs or Copper CAP Ls.
The number of UAPs or Copper CAP Ls supported by a WCS Subrack is dependent on several factors:
• the WCS Subrack ID
– original version
7635442-00 (WCS-4)
76355443-00 (WCS-2)
– current version
7635442-01 (WCS-4)
7635443-01 (WCS-2).
• the number of 57V Rectifier Modules installed in the PSU—one or two
• the electrical service voltage that powers the rectifiers —220 Vac or 120 Vac.
• the CAT Card version —7633228-01 or 7633228-02
The following subsections provide the information you need to apply these factors against installation
parameters.
ERA Software Power Estimates
The ERA software uses the power estimates shown in Table 4 to determine the number of UAPs or Copper
CAP Ls that can be powered via Power over CAT6A for a specific configuration.
CAT Cards
Table 5 defines the number of UAPs and Copper CAP Ls that the original version CAT Card (7633228-01) and
the current version CAT Card (7633228-02) can power.
Table 4. Software Assigned AP Power Consumption
AP/Device
Software-Assigned
Power Consumption
(Watts)
UAP 85
CAP L 125
1 Gb Ethernet device 35
Table 5. Number of APs that can be powered per CAT Card by version
CAT Card ID UAPs
CAP Ls
(Without 1G Devices)
CAP Ls
1
(Including Cascaded
Secondary CAP Ls)
CAP Ls
(With 1G Devices)
7633228 - 01 6 4 8 3
7633228 - 02 8 4 8 4
1 One locally powered secondary CAP L can be connected to each primary CAP L in cascade mode. Secondary
CAP Ls in a cascade do not draw power from the WCS. Cascaded APs do not support 1G devices.
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