Download TR41.9.2-04-05-012-MR1-OPS-voltage

TR41.9.2-04-05-012-MR1
STANDARDS PROJECT:
TR41.9.2 – Update TSB31-C Section 8.3 for Hazardous voltage
limitations – Off premises station voltages - TIA 968-A Section
4.4.1.4.
TITLE:
Proposal to update TSB31-C Section 8.3 for Hazardous voltage
limitations – Off premises station voltages - TIA 968-A Section
4.4.1.4.
ISSUES ADDRESSED:
Update TSB31-C Section 8.3 for Hazardous voltage limitations –
Off premises station voltages - TIA 968-A Section 4.4.1.4.
SOURCE:
Siemens ICN
CONTACT:
Tailey Tung
Phone: 408-492-5049
Fax:
408-492-2563
Email: [email protected]
DATE:
April 13, 2004.
DISTRIBUTION TO:
TIA TR41.9.2
KEYWORDS:
TSB31-C Section 8.3 test procedures
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This document has been prepared by Siemens ICN to assist the TIA Engineering Committee. It is
proposed to the Committee as a basis for discussion and is not to be construed as a binding
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8.3
8.3.1
Hazardous Voltage Limitations, OPS TIA-968-A, 4.4.1.4
Background
The Off Premises Station (OPS) function in CPE provides loop start line signaling similar to that
normally provided by a CO line circuit. This means that it provides not only the battery necessary
for talking and dc signaling but also the ac ringing voltage for signaling from the CPE to the
station equipment. A network private line facility connects the OPS line circuit with the remote
station equipment. Thus, there are two network interfaces, one at each end of the private line
facility. Approved station equipment is used as the off premises station. The hazardous voltage
requirements for OPS ports were written to protect network personnel. The ac voltage limit for
ringing exceeds the combined ac/dc limit for non-hazardous voltages, but is to meet specific
duration requirements to render it non-hazardous.
8.3.2
Purpose
To verify that the OPS line interface complies with the specified ac and dc voltage limits.
8.3.3
Equipment
(1)
DC voltmeter SEL# 22.
(2)
True rms ac voltmeter SEL# 41.
NOTE: Refer to Section 5.3 for equipment details.
8.3.4
Equipment States Subject to Test
(1)
Idle open circuit.
(2)
Ringing open circuit.
8.3.5
(1)
(2)
Procedure
In the idle open circuit state, measure the dc voltage with the dc voltmeter connected
between:
(a)
T(OPS) and R(OPS);
(b)
T(OPS) and ground;
(c)
R(OPS) and ground.
In the idle open circuit state, measure the extraneous ac voltage with the ac voltmeter
connected between:
(a)
T(OPS) and R(OPS);
(b)
T(OPS) and ground;
(c)
R(OPS) and ground.
(3)
(4)
8.3.6
In the ringing open circuit state, confirm that the ringing signal is applied to the proper lead by
measuring the ac voltage with the ac voltmeter connected between:
(a)
T(OPS) and ground;
(b)
R(OPS) and ground.
Perform tests specified in Section 8.8 to verify compliance with ringing source requirements.
Alternative Methods
None suggested.
8.3.7
(1)
(2)
(3)
Suggested Test Data
DC voltages during idle open circuit state:
(a)
T(OPS) and R(OPS);
(b)
T(OPS) and ground;
(c)
R(OPS) and ground
Extraneous ac voltages during idle open circuit state:
(a)
T(OPS) and R(OPS);
(b)
T(OPS) and ground;
(c)
R(OPS) and ground.
Ringing ac voltages during ringing open circuit state:
(a)
T(OPS) and ground;
(b)
R(OPS) and ground.
(4)
Verification of proper application of ringing.
(5)
Test data as specified in Section 8.8.7.
8.3.8
Comments
Test results that comply with the requirements of ANSI/TIA-968-A, 4.4.1.4 as tested here also
satisfy the signal power requirements in ANSI/TIA-968-A, 4.5.2.7.1 and 4.5.2.7.2.
Refer to 4.4.3 for the definition of non-hazardous voltage source.