PDH networks tend to follow either the European E1, E2, E3, ... format or the North American T1, T2, T3, ... format. Typically devices making use of PDH devices need to be assessed against the relevant regulatory requirements for EMC, Radio and Safety. In some markets Telecoms Performance also has to be assessed to obtain regulatory certification.

Global Approvals
For Safety, there are well-established routes to obtain the necessary certification to demonstrate compliance for most markets. The CB Scheme offers one such route and covers all the major markets around the world.
For EMC, Radio and Telecoms performance the TRaC Approvals Group can offer a completely managed service.

Testing Services
Regulatory Testing
Most devices with PDH interfaces will be IT or datacoms equipment. As such this will define the applicable EMC standards. If applicable, Telecoms regulation is often based on the generic ITU-T standards for PDH devices.
As an example, the table below lists the necessary regulatory requirements for Europe and the US.

	European Requirements	US Requirements
Radio	-	-
EMC	EN55022, EN55024	CISPR22, CISPR24
Telecoms	-	TIA-968-A
Safety	EN60950-1	UL950-1: 2001

Conformance Testing
In addition to regulatory requirements, the conformance testing provides confidence that the product is operating as intended and adds value to prospective customers.
Below are listed example conformance standards for European and US markets for PDH devices:

	European Requirements	US Requirements
Telecoms	TBR 12/TBR 13 ITU-T G.703, G.704	ANSI T1.403