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MX250 Hardware Manual
RTC
real time clock
RU
rack unit (1.75 in, 44.45 mm)
Rx
receive
RxD
receive data (or received data)
s
second
SC
system controller
SF
superframe format for T1, comprising 12 frames in a superframe (D4)
SPT
spanning tree protocol
SRAM
static random access memory
T1
T-carrier for digital signal level 1 (1.544 Mb/s)
TDM
time division multiplexing
TIA
Telecommunications Industries Association
Tx
transmit
TxD
transmit data (or transmitted data)
U
see
RU
UI
user interface
UL
Underwriter’s Laboratory
UPS
uninterruptible power supply
URL
universal reference locator
V
Volt
Vac
Volts with alternating current
Vdc
Volts with direct current
VF
voice frequency
Vpp
Volts peak to peak
W
Watt
WAN
wide area network
Summary of Contents for MX250
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