Essential key element of CMTS-CABLE Modem Synchronization .

Safecom INGRESS GATE technology (Patent p)

“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—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.

Ingress Noise?Perhaps an obvious question?

“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

54-1002MHz5-42MHz

54-1002MHz5-42MHz

1550nm

1310nm

CATV RF

CMTSIP

Vidieo

Data

IP TVPSTN

CM

CM

CM

CM

Solving the “Funneling Effect”Principle of solving “Funneling Effect” by ingress Gate technology: 1. Cable Modem sends back RF signal use TDM model.2. Each Cable Modem’s upload time and time slot assignment are controlled accurately by CMTS.3. At any given time, only one Cable Modem upload signal can take place in the CABLE system.4. Ingress Gate opens upstream channel only when Cable modem is transmitting. 5. Ingress Gate keeps all other upstream paths closed, therefore only one path at a time can transmit

a signal to CMTS.

54-1002MHz

5-42MHz

1550nm

1310nm

CATV RF

CMTSIP

Vidieo

Data

IP TVPSTN

CM

CM

CM

CM

1:32 32

Users54-1002MHz

5-42MHz

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.

Upstream Ingress Noise Test

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

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

Upstream Ingress Protection with RF Active forward/return gain

Upstream ingress gate stops carrier signals from customer premises into the network when the home devices are not actively transmitting.

INGRESS STOP Modem NOT active

Ingress Gate integrated with Drop Amplifier Block Diagram

Demo-Home CATV devices NOT active

From customer premises

High Pass Filter

High Pass Filter

Low Pass Filter

Low Pass Filter

From CATVNetwork

Gate Close

Upstream ingress gate allows carrier signals from customer premises into the network only when the home devices are actively transmitting.

Modem ACTIVE

From customer premises

From CATVNetwork High Pass

FilterHigh Pass

Filter

Low Pass Filter

Low Pass Filter

Demo-Home CATV devices active

Gate OPEN

Ingress Gate integrated with Drop Amplifier Block Diagram

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

Gate open Gate Closed

Competitive analysisSafecom Company 3 Company 2 Company 1

Usage-based upstream Gate Technology : Open only when Modem transmitting

Ingress detection and 6dB attenuation

Frequency Divisionturn theupstream path to ON, OFF, or6 dB attenuation

Technology

Very Low Med High Med Cost

No Yes Yes Yes Needs ingress detection system

Home (by customer or technician ) Network Network Network Installation

No RF disconnections 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

Broadcast continues during installation

Safecom’s IngressGate™ (Patent p.) vs Opposite Phase

IngressGate™ SolutionPatent 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

Thank You