1. Safecom INGRESS GATE technology (Patent p)
Essential key element of CMTS-CABLE Modem Synchronization.

2. “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.

3. 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.

4. “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.

5. Solving the “Funneling Effect”
Principle of solving “Funneling Effect” by ingress Gate technology:
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.

6. 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.

7. 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.

8. 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

9. 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.

10. “Passing” Upstream

11. Failing” Upstream

12. 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

13. Ingress Gate integrated with Drop Amplifier Block Diagram
Demo-Home CATV devices NOT active
From CATV
Network
High Pass Filter
High Pass Filter
From customer premises
Gate Close
Low Pass Filter
Low Pass Filter
INGRESS STOP
Modem NOT active
Upstream ingress gate stops carrier signals from customer premises into the network when the home devices are not actively transmitting.

14. Ingress Gate integrated with Drop Amplifier Block Diagram
Demo-Home CATV devices active
From CATV
Network
High Pass Filter
High Pass Filter
From customer premises
Gate OPEN
Low Pass Filter
Low Pass Filter
Modem ACTIVE
Upstream ingress gate allows carrier signals from customer premises into the network only when the home devices are actively transmitting.

15. Ingress gate allows upstream signals from customer premises into the network only when the home devices are actively transmitting.
Gate open
Gate Closed

16. Competitive analysis Safecom
Company 3
Company 2
Company 1
Usage-based upstream Gate Technology : Open only when Modem transmitting
Ingress detection and 6dB attenuation
Frequency Division
turn the
upstream path to ON, OFF, or
6 dB attenuation
Technology
Very Low
Med
High
Cost No
Yes
Needs ingress detection system
Home
(by customer or technician )
Network
Installation
No RF disconnections during installation
Disconnect RF signal to large area during installation
Broadcast continues during installation

17. Safecom’s IngressGate™ (Patent p.) vs Opposite Phase
IngressGate™ Solution
Patent p.
Opposite Phase concept.
Operates as upstream gate that opens only when the modem transmits.
Opposite phase merging.
Technology
Full
15-35 dB ingress isolation.
Partial
0- 6 dB only ingress reduction.
Effectiveness
Based on the burst nature of the return path.
Assumes ingress noises are at the same phase or from the same source.
Operating
principle
Solves and blocks all ingress noise from customer premises.
Cannot solve ingress problems from customer premises.
Solution

18. Thank You