Here are some specs of the modem I found. It would be interesting to compare this to other modems to see which are faster. As far as the link to the repeater on Amazon it claims 800Mb/s speed but the source it connects to only goes to has "2.4GHz with 300/450 Mbps PHY data rate" at 18 dbm power output, so you couldn't get 800Mb/s if you wanted to.
I saw on hack 5 how the FCC limits the "watts" that can come out of these legally. Some wifi devices have more TX power but will use an antenna with less gain or a lower power receiver with a more efficient antenna. Some receivers can be adjusted to put out more watts, then you can just add a more efficient antenna giving you an equivalent of about 60 watts, more if you don't really care about the rules! Those kind of powers could give your wifi the range of a cell phone. I think the easiest way to boost signal would to choose a wifi device with a "detuned" antenna and put on a better one.
http://web.archive.org/web/20101207035322/http://www.smc.com/files/AX/SMCD3GNVFeatureSheet.pdfHARDWARE FEATURES
Platform independent – works with PC,OSX,
Linux, MAC, UNIX
DOCSIS 1.0/1.1/2.0/3.0 compliant
F type RF connector for cable network
interface
Four RJ-45, 10/100/1000 Ethernet connector
for LAN
Two RJ-11 connector for voice
USB 2.0 Host Port
One AC 110V power input
SOFTWARE FEATURES
Compliant to MCNS DOCSIS 1.1/2.0/3.0
specifications
Supports UDP, IP, ARP, ICMP, DHCP, TFTP,
SNMP, HTTP
Support G.711(A-Law, Mu-Law), G.723.1, G.
729A, G.729E voice compression
Voice Activity Detection(VAD) with Comfort
Noise Generation to save bandwidth
consumption
Support Auto-Jitter buffer adjustment to adapt
with the jitter of Internet traffic
Keep alive intervals and backup support to
reconnect to redundant server
DHCP, TFTP and ToD clients, provide device
auto configuration
Support G.168 Echo Cancellation up to 16ms
Support caller ID generation for USA, Japan
and China
No need to have fixed IP
Provide regional profile to accommodate the
regulation for different country
Support standard SNMP, MIB-II, Ethernet-like
MIB, Bridge MIB, RF Interface MIB, Cable
Device MIB, Baseline privacy Interface MIB
Supports TFTP software download
Power on self-diagnostic
Browser-based configuration and
management
Easy to install and friendly to user, just plug
and play
COMPLIANT STANDARD
DOCSIS 1.0 1.1, 2.0, 3.0
PACKET CABLE 1.5
WiFi Alliance
UPnP
UL 60950
FCC Part 15 Class B
DIMENSIONS (W X L X H)
218 x 212x 75 mm
8.58.1 x 8.33 x 2.95 in
MAX. NUMBER OF CPES
64 (64 MAC addresses)
FILTERING
LLC: 16, IP: 64
RECEIVER
Demodulation: 64/256QAM
Max Speed: 38Mbps (64QAM)/43Mbps
(256QAM) per channel
Input Frequency Range: 88Mhz to 1002 MHz
DOCSIS 5120 Kbps/10Mbps (QPSK/16QAM)
DOCSIS 41.4Mbps (64QAM)/55.2Mbps
(256QAM) bonding (DOCSIS) per channel
Signal Level
-15dBmV to +15dBmV (Automatically Gain
Controlled by CM)
17dBmV
WIRELESS:
16 MB DRAM
2T3R 2.4GHz with 300/450 Mbps PHY data
rate
TX power: 18dBm
RX Sensitivity: -76dBm@54Mbps
20MHz/40MHz channel bandwidth
Hardware NAT, QoS, TCP/UDP/IP checksum
overloading. QoS: WMM/WMM-PS
Supports L-SIG TXOP
Embedded MIPS 74KC 500MHz with 64KB I
cache/32 KB D cache
Legacy and high throughput modes
Reverse Data Grant (RDG) support
Dynamic Frequency Selection (DFS/DFS2)
16 Multiple BSSID
Security: WEP-64/WEP-128/TKIP/AES/WPA/
WPA2/HWWAPI
WPS (WiFi protected setup) PBC, PIN
TRANSMITTER
Modulation
64/256QAM
TDMA: QPSK, 8QAM, 16QAM, 32QAM,
64QAM
S-CDMA: QPSK, 8QAM, 16QAM, 32QAM,
64QAM,128QAM
Max Speed
Over 120Mbps with 4 bonding upstream
channels
Frequency Range
5 to 42MHz (edge to edge) DOCSIS
Bandwidth
0.2, 0.4, 0.8, 1.6, 3.2MHz
TDMA: 200, 400, 800, 1600, 3200, 6400 kHz
S-CDMA: 1600, 3200 and 6400 kHz
Signal Level
+8dBmV to +58dBmV (QPSK)
+8dBmV to +55dBmV (16QAM)
TDMA:
+8 to +54 dBmV (32QAM, 64QAM)
+8 to +55 dBmV (8QAM, 16QAM)
+8 to +58 dBmV (QPSK)
S-CDMA:
+8 to +53 dBmV (all modulations)
(Output level of CM can automatically
controlled by CMTS through power ranging
function), Step: 1dB
Output Return Loss
> 6 dB (5-42 MHz) and (91~857 MHz)
TELEPHONY
Supervisory Voltage: 48V dc nominal
Maximum Loop Length: 1500 ft (457M) of 26
AWG (0.4 mm) wire
Ringing Load Capacity: 5 REN per line
Programmable Interface for Worldwide: Select
by country code and modem config file
Protocol
NCS/MGCP 1.0 for PC 1.5
SIP RFC3261 for PC 2.0 (in later software
release)
CODEC
G.711A, G.726, G.728, G.729E, T.38, G.722
Fax Support & Fax Relay over IP: T.38
LED
Front Panel: Power, US/DS, Online, WiFi, Tel 1,
Tel 2, Battery
Connector Side: Active Ethernet LAN for 4 port
OSS
Protocol: ICMP/SNMP V1, V2c, V3
MIB: MIB II / MCNS MIB/Hitron Proprietary
MIB, PKT-SP-MIB-EXSIG1.5-I01-050128
BATTERY BACKUP WITH LITHIUM BATTERY
CELLS
2600mAH - 5hrs operation and 8 hrs standby
POWER
Input DC: AC 110V
Consumption: TBD
ENVIRONMENT
Operating temperature
Regular Model 32 F (0 C) to 104 F (40 C)
Operating humidity
10% to 90% (Non condensing)
Storage temperature
-4 F (-40 C) to 140 F (80 C)
Surge Protection
On RF Input shall sustain at least 4.5 kV
On Ethernet RJ-45 shall sustain at least 3KV.