ANSI SCTE-110-2011 pdf download Hybrid Fiber Coax Outside Plant Status Monitoring: Alternative Power Supply to Transponder Interface Bus (PSTIB) For HMS Transponders
2.2 Section
3.1.4 of ANSI/SCTE 25-3 2010 Section
3.1.4 of ANSI/SCTE 25-3 20101 shall be replaced by the following in its entirety.
3.1.4 Transponder Power 1. The power supply shall implement appropriate isolation and system grounding such that the communication interface and transponder power remains functional under the operating conditions defined herein. 2. The transponder shall be bonded to chassis ground directly and/or through the system coaxial cable sheath.
3. Optionally, transponder power may be bonded to chassis ground at the power supply interface. The power supply vendor shall determine this.
4. The power supply shall implement appropriate over-current and short-circuit protection of transponder power such that the communication interface and transponder power remain functional under the operating conditions defined herein.
5. Up to eight (8) power supplies may be connected in parallel using the RS-485 interface. 6. Under the operating requirements defined herein, the Power Supply shall be able to supply 4.8 watts of continuous power to the PSTIB.
7. Under the operating requirements defined herein, the Transponder shall draw no more than 4.8 watts of power from the PSTIB.
8. During startup, while the power supply is coming up to the minimum voltage requirement, the transponder shall limit inrush current to no more than 250mA. and power draw to no more than 4.8 watts. 9. During startup the Power Supply shall achieve the minimum voltage requirement within 1 second.