Users Manual Part 1

4.7
Expansion Cabinet Connections
With an Expansion Cabinet, a site may be increased by up to four Base Radios per Expansion
Cabinet. The MTS 4 Expansion Cabinet can be placed on either the left side of the MTS 4 Prime
Cabinet or on the right side. Different scenarios of connecting the MTS 4 Expansion Cabinet with the
MTS 4 Prime Cabinet are described in the following sections.
4.7.1
TX Connections
Depending on the Prime Cabinet configuration, TX connections between the MTS 4 Prime Cabinet and
the MTS 4 Expansion Cabinet can be configured in two ways:
• Combining eight channels onto one Duplexer/Post Filter in the MTS 4 Prime Cabinet using a
phasing harness.
• Combining four channels from the MTS 4 Prime Cabinet onto one Duplexer/Post Filter in the Prime
Cabinet and combining four channels from the MTS 4 Expansion Cabinet onto another Duplexer/
Post Filter in the Prime Cabinet.
In Figure 60: Connection Between MTS 4 Prime Cabinet and MTS 4 Expansion Cabinet – Phasing
Harness
on page 130, all the eight channels (four channels from MTS 4 Prime Cabinet and four
channels from MTS 4 Expansion Cabinet) are combined using a phasing harness and connected to
one Duplexer/Post Filter in the MTS 4 Prime Cabinet.
NOTICE: Tx cable from Prime Cabinet to Expansion Cabinet is routed through the conjunction
hole on the side of the cabinets.
Figure 60: Connection Between MTS 4 Prime Cabinet and MTS 4 Expansion Cabinet – Phasing
Harness
ATCC
FRONT VIEW
CAN 2CAN 1
ATCC
DC IN
TX OUT
TX B
Inside ATCC
Interconnection
CAN 2CAN 1
ATCC
DC IN
TX OUT
TX B
Inside ATCC
Interconnection
TX A
TX A
ATCC
FRONT VIEW
DUPLEXER
TOP VIEW
MTS 4 Prime Cabinet MTS 4 Expansion Cabinet
CAN 2CAN 1
ATCC
DC IN
TX OUT
TX B
Inside ATCC
Interconnection
CAN 2CAN 1
ATCC
DC IN
TX OUT
TX B
Inside ATCC
Interconnection
TX A
TX
RX/TX
TX A
In Figure 61: Connections Between MTS 4 Prime Cabinet and MTS 4 Expansion Cabinet – Two Filters
on page 131, four channels from MTS 4 Prime cabinet are combined and connected to one Duplexer/
6802800U74-AP
Chapter 4: Hardware Installation
130