CAN/CSA-T540-M92

This National Standard of Canada is equivalent to American National Standards Institute standard ANSI T1.408-1990. 1.1 General It establishes performance and technical criteria for interfacing and interconnecting the various functional groups shown in figure 1. Compliance with this standard is intended to ensure compatibility at the interface points /a and /b (figure 1) and should not be construed as a constraint on the internal operation of the network, NTs or TEs. For an interim period¹), as noted in 5.4.3, equipment that provides a DSX-1 interface arrangement at reference points S and T, shall be considered as conforming to this standard. See annex B for characteristics of a DSX-1 interface. NOTE - The user's attention is called to the possibility that compliance with this standard may require use of an invention covered by patent rights. By publication of this standard, no position is taken with respect to the validity of this claim or of any patent rights in connection therewith. The patent holder has, however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the secretariat. The provisions of this standard are intended to be consistent with applicable requirements concerning safety and environmental conditions. Customer premises equipment (CPE) shall be subject to the applicable requirements of UL 1459, Telephone appliances and equipment²), and of the rules of the Federal Communications Commission (FCC). NOTE - Users are advised that CPE for primary rate ISDN may be subject to the FCC's Part 68 Rules, including the provision of output pulse generation capability beyond that required by this standard. Equipment manufacturers should ascertain the applicability of these requirements to their products. This standard is intended to remain consistent with the American National Standard for Telecommunications, Carrier to customer installation - DS1 metallic interface specification (DS1 standard), ANSI T1.403-1989. The DS1 standard contains specifications at the network interface (NI) for services at the DS1 rate. This primary rate (PR) standard defines specifications at physical interface points /a and /b (as shown in figure 1). Criteria covered herein include ISDn channel allocations, framing format, line code requirements, electrical characteristics, physical requirements, maintenance provisions, and other necessary criteria for: - compliance with the electrical specifications at the NI as covered in clause 5 of the DS1 standard, ANSI T1.403. It is important that the electrical specifications applicable to /a allow for a cable loss of up to 1.5 dB at 772 kHz between /a and the NI as defined in ANSI T1.403, where the associated equipment is connected to a public network; - the proper interfacing of interconnected CPE. 1.2 Structure Most requirements in this standard apply equally to /a and /b. For these requirements, there is no reference to an interface point and it is to be understood that the requirements apply at both points. For other requirements/provisions, the application is explicitly stated. Requirements applicable at /a and /b imply requirements on the interface cable as stated in clause 10. ¹) It is expected that this interim provision will be deleted from the next issue of the standard. ²) This standard is currently under development. Contact the secretariat for more recent information.