Transcript Safecom Ingress Gate (Patent p)

Safecom INGRESS GATE
technology (Patent p)
Essential key element of CMTS-CABLE Modem Synchronization.
“Noise” in the cable network is one of the greatest
hurdles to applying superior, high-speed data, DOCSIS
3.0 services, requiring high integrity signal
transmission.
Noise ingress reduces network capacity. Removing noise is
the greatest challenge faced by Cable operators as they
seek to migrate to 64 QAM and eventually to 256 QAM
digital modulations.
Ingress Noise?
Perhaps an obvious question?
Ingress noise—Over-the-air signals (2-ways radio, Off-Air, FM, Electrical
noise , etc.) that are inadvertently coupled into the nominally closed coaxial
cable distribution system. Ingress noise is difficult to track down and is
intermittent in nature. As much as 80% to 90% of noise and ingress on
the plant is generated at the Subscriber site.
“Funneling Effect”
“Funneling Effect” shows the structural defect of “the last two way signal over
coax part”. It limits performance of the network, and conceals the superiority of
the CMTS-CM Mode.
54-1002MHz
5-42MHz
CM
54-1002MHz
CATV RF
Vidieo
Data
IP TV
PSTN
IP
CM
1550nm
1310nm
CMTS
54-1002MHz
5-42MHz
CM
5-42MHz
CM
Solving the “Funneling Effect”
Principle of solving “Funneling Effect” by ingress Gate technology:
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Cable Modem sends back RF signal use TDM model.
Each Cable Modem’s upload time and time slot assignment are controlled accurately by CMTS.
At any given time, only one Cable Modem upload signal can take place in the CABLE system.
Ingress Gate opens upstream channel only when Cable modem is transmitting.
Ingress Gate keeps all other upstream paths closed, therefore only one path at a time can transmit
a signal to CMTS.
CM
54-1002MHz
CATV RF
IP TV
PSTN
IP
54-1002MHz
5-42MHz
1310nm
CMTS
CM
1:32
5-42MHz
CM
CM
32 Users
Vidieo
Data
1550nm
Upstream Ingress Noise Test
Disconnect from the tap and plug the drop cable directly into the meter. This
provides a spectral view of what is getting onto the upstream path from building
and transmitting back up the network.
Use the 5-65 MHz band.
Why Ingress Protection?
• Enables full network capacity utilization on the
upstream.
• Enhances VoIP, DOCSIS and advanced services
deployment.
• Improves Quality & Service.
• Reduces Operational Expenses (OPEX) for Ingress
detection and suppression.
Safecom’s IngressGate
Patent P. technology
• Gateway that allows carrier signals from the premises into the network only when
the home device is actively transmitting to the upstream
• Based on the burst nature of the upstream and the random presence of ingress
noise
• The technology is embedded into Safecom’s home amplifiers
• No need for expensive investment in ingress monitoring systems
• Results in dramatic reduction of the ingress levels
• No adverse effect on upstream and downstream signals
• Future implementation into Directional Couplers (DC) situated at the far end of the
network, close to the customer premises
Suggested Changes
• Add upstream spectrum test to each home installation.
• All ingress noise from 5 to 45 MHz must be lower than 30dBmV.
• If ingress above design level, simply replace regular home amplifier
with safecom IGDA model, Ingress Noise will immediately reduce by
min 15dB.
• If there is no home amplifier installed simply use Passive forward
INGRESS GATE 5dB return for blocking all ingress noise from premises.
“Passing” Upstream
Failing” Upstream
Upstream Ingress Protection with RF Active forward/return gain
 Cost-effective Patent P. technology for ingress suppression
 No need for expensive monitoring or useless detection
 Simple integration outdoor or indoor
 Plug and play device
 Best performance in the market
 Drop amplifier integration
 Passive Forward/Return available
Ingress Gate integrated with Drop Amplifier Block Diagram
Demo-Home CATV devices NOT active
From CATV
Network
High Pass
Filter
Low Pass
Filter
High Pass
Filter
Gate Close
From customer
premises
Low Pass
Filter
INGRESS STOP
Upstream ingress gate stops carrier signals from
customer premises into the network when the home
devices are not actively transmitting.
Modem
NOT active
Ingress Gate integrated with Drop Amplifier Block Diagram
Demo-Home CATV devices active
From CATV
Network
High Pass
Filter
Low Pass
Filter
High Pass
Filter
Gate OPEN
From customer
premises
Low Pass
Filter
Upstream ingress gate allows carrier signals from customer
premises into the network only when the home devices
are actively transmitting.
Modem
ACTIVE
Ingress gate allows upstream signals from customer premises into the
network only when the home devices are actively transmitting.
Gate open
Gate Closed
Competitive analysis
Company 1
Company 2
Company 3
Safecom
Technology
turn the
upstream path to ON,
OFF, or
6 dB attenuation
Frequency Division
Ingress detection
and 6dB
attenuation
Usage-based upstream Gate
Technology : Open only
when Modem transmitting
Cost
Med
High
Med
Very Low
Needs ingress
detection system
Yes
Yes
Yes
No
Installation
Network
Network
Network
Home
(by customer or technician )
Broadcast continues
during installation
Disconnect RF
signal to large area
during installation
Disconnect RF
signal to large
area during
installation
Disconnect RF
signal to large
area during
installation
No RF disconnections
during installation
Safecom’s IngressGate™ (Patent p.) vs Opposite Phase
IngressGate™ Solution
Patent p.
Opposite Phase concept.
Technology
Effectiveness
Operating
principle
Solution
Opposite phase merging.
Operates as upstream gate that opens
only when the modem transmits.
Partial
0- 6 dB only ingress reduction.
Full
Assumes ingress noises are at the
same phase or from the same source.
Based on the burst nature of the return
path.
Cannot solve ingress problems from
customer premises.
Solves and blocks all ingress noise from
customer premises.
15-35 dB ingress isolation.
Thank You