Network and Customer Installation Interfaces - Integrated Services Digital Network (ISDN) Primary Rate Layer 1 Electrical Interfaces Specification
|Publication Date:||1 May 1999|
This standard 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 Ia and Ib (Figure 1) and should not be construed as a constraint on the internal operation of the Network Terminations (NT), or Terminal Equipment (TE).
The provisions of this standard are intended to be consistent with applicable requirements concerning safety and environmental conditions. Customer installation (CI) equipment shall be subject to the applicable safety requirements, and the rules of the Federal Communications Commission.
This standard is an application utilizing the DS1 common criteria as specified in ANSI T1.403. The DS1 standard contains specifications at the network interface (NI) for services at the digital signal level 1 (DS1) rate.
This primary rate access (PRA) standard defines specifications at physical interface points Ia and Ib (as shown in Figure 1). Criteria covered herein include Integrated Services Digital Network (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 Ia allow for a cable loss of up to 5.5 dB at 772 kHz between Ia and the NI, when the associated equipment is connected to a public network;
− the proper interfacing of interconnected CI equipment.
The requirements in this standard shall apply equally to Ia and Ib unless otherwise specified. 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 and provisions, the application is explicitly stated. Requirements applicable at Ia and Ib imply requirements on the interface cable as stated in clause 10.