EE 407 Quiz 2
Mesh network topology
"Smart Meters" aggregate data over a wide geographical area using this type of wireless (sensor) network topology:
10 bits
A 'packet' of RS232 contains that many bits.
"increasing hamming distance by 1 (adding another parity bit on top)"
A SECDED code is generated from this code by doing this:
120Ohms
A communication system uses differential signaling. The characteristic impedance of the media is likely that many Ohms.
8 mA
A sensor is outfitted with a 4-20mA interface. If the physical quantity measures 1/4 of its maximum value the reading is that many mA:
IEEE 802.15.4 : Mesh network Zigbee Tree
A wireless sensor network is capable of multi-hop transmission. The network type is most likely:
SPI = 10 (typical) - 60Mbs RS232 = 19200 bps I2C = .35-3Mbs LIN = < 20kbs CAN = 125k - 1Mbs MOST = ~25Mbs
Among RS232, I2C, SPI, LIN, CAN, MOST, this serial interface is the 2nd fastest:
X+1
An CRC produces a even parity bit. The generating polynomial is:
1-Wire
An Ibutton device uses this type of a serial interface
Master-Slave scheme, half duplex, open collector, unique 64 bit ID or "Diode, Capacitor, Pull-up Resistor"
Any 1-wire device has this. Mark all that apply.
Beacon
Broadcasting of type of (MAC) frame allows for GTS in IEEE802.15.4
1kHz deviation (1.2kHz to 2.2 kHz)
HART uses FSK to transmit digital data in a 4-20mA current loop. The frequency deviation is that many kHz.
HR-WPAN(802.16.3) MR-WPAN(Bluetooth) ? LR-Wpan?
In the IoT space, IEEE802.15.4 competes against these wireless PAN standards. Mark all that apply.
MOD(23,3) =2 MOD(-23,3)= 1
MOD(23,3) has this value and MOD(-23,3) has this value:
(2^12-1)/1MHz = 4.095ms
Maximum-length sequence generator employs a 12-stage shift register clock at 1MHz. The period of the produced PN code is approximately that many msec:
ZigBee, ISA100, Wireless HART
Multiple users in IEEE802.15.4 are accommodated using this multiple-access scheme. Mark all that apply.
D latch, XOR Gates, Shift Register,
One could use this hardware to produce a parity of 10 bits. Mark all that apply.
B=9.8 MHz
Receiver extracts maximum power of -134dBm (from an antenna). If the SNR is 0dB, the BW of the signal must be that many MHz:
BPSK
Suppressing the carrier of an ASK modulation creates this type of an angular modulation:
x^11+x^7+x^6+x^5+x^4+x^3
Table I in Koopman/Chakravarty's paper lists a CRC of 0x8F8. The corresponding generating polynomial is:
Reverse Reciprocal
The HEX values in Table I in Koopman/Chakravarty's paper use this representation (normal, reverse, reciprocal, and reverse reciprocal)
C,A= 1 C,N=3 A,N=4
The Hamming distance between the 3 letters in "CAN" is:
-158.5 dbW
The Section 2 of https://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf lists this value for the minimum strength of received the GPS signal.
160 us
The acknowledgement frame in IEEE802.15.4 is that many micro-seconds:
-15 to -5V (lecture 11 slide 3)
The idle state of an RS232 interface measured at the line driver falls between these two values:
0x3F
The letters in "PRODANOV" are converted to 8-bit ASCII and the LRC is calculated. The LRC value (in HEX) is:
CRC LRC VRC Checksums LDPC BCH normal parity check Solomon-reed reed-muller
These codes are 'error detecting' (or correcting) codes. Mark all that apply.
Gold(odd and even); Kasami(small and large); Bent;No;Gong;Paterson; Z4linear(Family I and Family II) Weil; New Code Family(Category 1 and Category 2)
These codes are 'spreading codes'. Mark all that apply.
RS-485, RS-422, CAN-C/CAN-B, MOST, Flexray, Some J1850s, MODbus
These common serial protocols use differential (balanced) signaling. Mark all that apply.
I2C, I3C, 1-Wire, LIN Bus, CAN Bus
These serial interfaces use 'open collector' signaling. Mark all that apply.
Latches and XOR? Linear Feedback Shift Register (LFSR)
This similarity exist between the hardware required to produce CRC and maximum-length sequences
