ANSI SCTE 195:2019 pdf free download – XFP-RF: Interface Specifications for an RF-Modulated Small Form Factor Pluggable Optical Module
The standardization and deployment of pluggable optical interfaces for headend equipment offer cost and power savings to cable operators. However, implementing pluggable optical interfaces in these devices presents significant technical challenges, since the lack of standardization may result in too many combinations of interfaces to support effectively in a headend device (power, wavelengths, cards, etc.). Because of this challenge, the following specification proposes a standard for the interfaces between a downstream laser transmitter module and its host. The module is based on the [XFP MSA], but the input will consist of RF-modulated signals that will be amplitude modulated onto an optical carrier. For the purpose of this specification, this module is referred to as XFP-RF. This pluggable XFP-RF optical transmitter module could be integrated into headend equipment, such as a Converged Cable Access Platform (CCAP), a Cable Modem Termination System (CMTS) an Edge QAM modulator, or a forward optical transmitter shelf, reducing the need for devices dedicated to forward lasers. The XFP-RF optical transmitter module will function as a downstream laser for the output of cable edge devices. This specification will focus on the communications, electrical, and mechanical interfaces for the XFP-RF optical transmitter module. Unless otherwise noted, requirements within this specification apply both to the transmitter module and its host.
2.0 NORMATIVE REFERENCES
The following documents contain provisions, which, through reference in this text, constitute provisions of the standard. At the time of Subcommittee approval, the editions indicated were valid. All standards are subject to revision; and while parties to any agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the documents listed below, they are reminded that newer editions of those documents may not be compatible with the referenced version.
6.0 MANAGEMENT INTERFACE
2-Wire Communications (I²C) for the XFP-RF module are based upon [XFP MSA]. I²C is an implementation of the NXP (formerly Philips) I²C [UM10204] specification with mapped memory address locations (also known as “well-known addresses”) for diagnostics and operations. The SFF Committee specifies the I²C common memory mapping in [XFP MSA] and [SFF-8477] for SFP and XFP, as well as additional physical layer requirements. This specification uses the same well-known memory map locations (addresses) for functions that are the same or substantially similar. Because the XFP-RF is a RF transmitter (and not a digital transceiver), some memory map fields from [XFP MSA] and [SFF-8477] are re-allocated or not used; in addition, some memory map fields have been added.