PMP 400/430 and PTP 200/230 Series Configuration and User Guide
pmp-0042 (March 2014)
Page 76 of 98
Example 1: Large distance - augmentation needed, doubling of throughput
Subscriber 1 has a PMP 430 SM at a 7 mile distance from the PMP 430 AP and no antenna augmentation.
In a PMP 430 system this subscriber can communicate in QPSK mode. When the PMP 430 AP is replaced
by a PMP 450 AP, this subscriber can no longer connect without antenna augmentation. If a LENS is added
to the SM, it can now connect and communicate at QPSK. The throughput experienced by this subscriber is
the same as the one it was experiencing before. If the PMP 430 SM is replaced by a PMP 450 SM with a
LENS, the PMP 450 can now communicate in QPSK MIMO mode, doubling the SM’s throughput.
Example 2: Medium distance – no augmentation needed, same throughput
Subscriber 2 has a PMP 430 SM at a 4 mile distance from the PMP 430 AP and no antenna augmentation.
In a PMP 430 system this subscriber can communicate in 16 QAM mode. When the PMP 430 AP is
replaced by a PMP 450 AP, the PMP 430 SM can now communicate in QPSK mode, with a throughput
equal to half the original throughput. If the PMP 430 SM is replaced by a PMP 450 SM, the PMP 450 can
now communicate in QPSK MIMO mode, which provides the same throughput as the original 16 QAM SISO
mode.
For this user the maximum throughput has not changed upgrading from a PMP 430 network to a PMP 450
network, but the more PMP 430 SMs are replaced with PMP 450 SMs the higher the AP sector capacity is,
more than doubling the original PMP 430 AP sector capacity. Even if the peak speed of one SM is the same,
all other PMP 450 users are served faster because they can communicate in MIMO mode and the whole
sector can now experience a higher throughput.
Example 3: Small distance – no augmentation needed, doubling of
throughput
Subscriber 3 has a PMP 430 SM at a 0.75 mile distance from the PMP 430 AP and no antenna
augmentation. In a PMP 430 system this subscriber can communicate in 64 QAM mode. When the PMP 430
AP is replaced by a PMP 450 AP, the PMP 430 SM can still communicate in 64 QAM mode, with the same
original throughput. If the PMP 430 SM is replaced by a PMP 450 SM, the PMP 450 can now communicate
in 64 QAM MIMO mode, doubling the SM’s throughput.