ViaSat ArcLight, User Manual, Page: 30 / 368

ArcLight Hub User’s Guide
xxii 1081006 Rev. 001
PBR Policy based router A technique used to make routing
decisions based on policies set by the
network administrator. When a router
receives a packet it normally decides
where to forward it based on the
destination address in the packet, which
is then used to look up an entry in a
routing table. However, in some cases,
there may be a need to forward the packet
based on other criteria, such as the size of
the packet, the protocol of the payload, or
some other characteristic.
PCCC Parallel concatenated A parallel concatenated convolutional
convolutional code coding scheme utilizes tail-biting
nonrecursive systematic convolutional
codes. The associated decoder iteratively
utilizes circular maximum a posteriori
decoding to produce hard and soft
decision outputs resulting in improved
error-correction performance for short
messages.
PCM
Parameter change message The parameter change message is sent
from the RtNMS to the VMBR and conveys
the network configuration changes for a
particular VMT. The network
configuration changes may be return
channel parameters, forward channel
parameters, or other network specific
parameters such as APR, Congestion
control, etc.
PCMA
Paired carrier multiple-access PCMA enables multiple, lower rate
inbound channels to occupy the same
physical bandwidth as the outbound
transmission.
PCMAHC PCMA hub canceller Allows outbound and inbound satellite
signals to operate in the same satellite
bandwidth.
PEP
Performance enhancing proxy A general term referring to any process,
like SCPS, that breaks the TCP end-to-end
connection to avoid setting window sizes
too low.
PIC
Peripheral interface controller A family of RISC microcontrollers available
with various on-board peripherals and
programmable memory.
PID Packet identifier An ID for a formatted block of information
carried by a computer network.