Product Info

METRO CELL OUTDOOR (DE/RE) CDMA BTS RADIO DEVELOPMENT
PROPRIETARY CELL SITE REQUIREMENTS
Feb. 2001 - 20 - Issue 01 Stream 00
8.0 Connections and Cabling
8.1 FRM Power Connections and Cables
DC power is conducted to individual FRMs via two conductor (-48V, BR) shielded (ground)
cables, one cable for each FRM. The size of the power cable depends on the cable run length.
The DC power cable from DEI enters the FRM enclosure via the Power Entry Module (PEM)
The specifications for these external FRM dc cables are as follows:
• less than 3000 feet, use 2 conductor #8 AWG shielded cable
• Between 300 and 600 feet, use 2 conductor #6
• Allowed cable voltage drop: 6 Vdc maximum (-48V and Rtn combined)
• Cable terminations: two-hole lugs at the DEI BRR plate, twist-lock type
connector at FRM (to mate with the PEM)
• Shield termination: grounded at both the FRM and DEI ends, and at the base of
the tower
The FRM DC cable is sized for voltage drop, not ampacity
The optical link enters the FRM via the electro-optic module (EOM)
8.2 FRM Interconnect
Table 8.1 next shows the FRM external interconnect single carrier configuration.
8.3 Fiber
The optical link to the FRM contains 4 fibers per link. two receive and transmit pairs for
redundancy, unless multi carrier deployment is used, when soft redundancy is handled by the
other carrier and only two fiber are used (other two left unused). The main portion of the link
will run on outside plant cable capable of vertical ascent, terminated at the FRM by a standard
SIECOR optifit termination. The transceivers will be housed in a heated optical termination unit
which is connected to the FRM by electrical interconnect. The high speed signals will be carried
by 4 coaxial links.