DISAC 310-70-1 PDF

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Directive In this document the. OPR: GE. For terms other than those defined below in this Circular, see reference 4. The specified maximum permissible change in the electrical performance parameters that indicate specific link and multilink performance from or between technical control facilities defined with reference to measured values of the same parameters made during a comprehensive alignment and maintenance overhaul, or from official subsystem acceptance test documents.

For the purposes of this Circular, "end-to-end" is defined as a circuit from one user or terminal point to the other user s or terminal point s as established by the Telecommunications Service Order TSO.

Accordingly, performance and maintenance tests or adjustments that require complete disruption of a service will not be scheduled regularly, except as required by references 4. The application of these standards is covered in other publications such as references 4. CHANGE 1: 24 July The references have been partially updated in Paragraph 4, all references will be corrected with the next revision to this Circular and eliminating pay for view web sites.

Major changes to Chapter 3, a new Figure F3. All the tables are now in separate files to accommodate easier downloading and printing. All outdated hypertext links were corrected and all tables were placed in separate files. Recommend this Circular be reviewed in its entirety. Purpose 2. Applicability 3. Authority 4. References 5.

Definitions 6. Policy 7. See Table T1. Details of this procedure can be found in reference 4. Reference 4. Criteria provided in reference 4. Electrical interface standards for digital circuits are contained in references 4. Updates to this circular will be provided through official message page change or next revision of this circular. Government-Owned and Leased Circuits. The GIG Technical Parameters for both Government-owned and leased circuits are combined in tables within this document.

GIG parameter codes and circuit parameters are based on both U. Government owned analog voice parameters are based upon current commercial lease parameters.

Commercial leased circuit specifications channel type or conditioning of domestic carriers are filed with the Federal Communications Commission as tariffed items. Conflicts between commercial leased circuit specifications and GIG circuit specifications will be esolved in favor of commercial leased circuit specifications provided by commercial carriers. The minimum GIG circuit performance as measured end-to-end will be equal to, or better than, the values specified in these tables.

Table T2. Finally, table T2. This chapter includes various tariffed service offerings currently available from and recommended by U. The information contained herein provides a reference for use in evaluating government owned and domestic leased systems, and for use in leasing new commercial communications services required in the GIG.

Nos 9, 10, and Inclusion of this information in this circular does not constitute DOD endorsement of a particular domestic common carrier in providing required services. Requirements for GIG service may be satisfied by the use of services from alternate carriers providing equal or better performance to parameters referred to in this circular.

The characteristics are guaranteed performance values except those values indicated as "objectives". Guaranteed values are normally verified at circuit activation, periodically thereafter to ensure sustained performance, and during troubleshooting and circuit outage verification procedures. Measurement of these parameters is at the discretion of the Government, and the contractor normally will meet the "objective" values within the capability of available facilities.

These recommendations have been adopted for use in the GIG. Recommendation M. The M1, M2, and M3 schedules are provided in table T2. All values refer to "psophometrically weighted" measurements.

Future measuring sets should be equipped with both "C-message" and "psophometric" filters. Reading taken with "C-message weighting" can be converted by using Supplement 3. In case of dispute over a value when a "C-message" filter is used, the measurement made with the "psophometric" filter should be taken as the valid measurement.

When circuit responses are such that losses between and Hz are more than several tenths dB, the response values will be referred to Hz. These standards apply to Government-owned systems and provide criteria by which both the military departments and DISA can measure how effectively new and old equipment, facilities, or systems are maintained and operated. These standards apply to link and multilink channel performance technical control to technical control in contrast to the Technical Parameters that apply to circuits end-to-end.

In view of the nonuniform performance over many different GIG link and multilink configurations, even with optimum transmission adjustment, performance parameters should be determined individually for each GIG link and multilink.

If performance data are not available, table T2. Voice band modems operating only at rates greater than or equal to bits per second will be supported only by analog voice channels with GIG parameter codes using 64 kbps PCM C2, M1, and M3. Measurements made by the technical controller that fail to meet performance baselines established in previous TEP evaluation reports within the tolerance of table T2.

All reports required under other directives will continue and may include these data, if appropriate. In some cases, the maximum permissible deviation from the channel performance standard may result in a performance value which will not support the technical performance parameter of the circuit riding the channel. Although the Channel Performance Standards specify thresholds for removing a channel from service, the procedures and authority to do so are contained in DISAC , reference 4.

Voice signals are generated by human speech and present a constantly fluctuating power level. Variations up to 20 dB are common and are caused by such factors as the differences in emotional content of the speech, talker volume, background noise, telephone subset efficiency, microphone battery current, and net loss of the subscriber loop.

Since power levels vary widely, circuit adjustments should not be made on the basis of voice signal power levels. All communications circuits used in the GIG should be carefully engineered and adjusted prior to operation. Circuit net losses should be measured with a standard single frequency test tone. There will be a wide variation in voice levels measured in the GIG due to the variations in user voice levels. As a general rule, voice peaks should not exceed 0 dBm0 referred to the 0 Test Level Point.

If the peak levels of a circuit consistently exceed 0 dBm0, the technical controller should investigate the cause to determine if the circuit net gain or loss is correct.

If a balanced high impedance oscilloscope is used, procedures in reference 4. The peak to peak voltage stated in reference 4. GIG access facilities operating at higher levels than defined in reference 4.

Voice signal power levels to and from non-GIG facilities will be adjusted by inserting appropriate net losses or gains at facility interfaces to effect system compatibility. Circuit engineering details are provided in reference 4. The test tone power levels and test frequency to be used when testing Government-owned and commercially leased communications circuits, or channels, in the GIG will be as specified herein.

The standard test tone frequency for testing Government-owned GIG voice frequency circuits will be Hz. The reference frequency for subparagraph C2. An Hz test tone applies to harmonic distortion, subparagraph C2. Certain test equipment i. When the standard test tone frequency is not available an alternate test tone frequency of Hz may be used. The design power levels at these transmission level points TLP's are expressed in relationship to a reference point which is defined as the 0 TLP.

The transmission level of any point in a transmission system is the ratio in dB of the power of a signal at that point to the power of the same signal at the reference point. In this Circular, power levels are expressed in dBm0; i. For example, the standard test tone level in the GIG is dBm0. At the 0 TLP, the absolute power level would be - 10dBm. At TLP, the test tone level would be dBm. The standard test tone power level is used for the following measurements: C2.

Tests using this tone should be performed as required to ensure circuit quality. The use of test tone power levels higher than the standard level is permissible to measure parameters that are level sensitive, such as harmonic distortion or intermodulation noise at high levels.

Such test are permitted only during nonbusy hours or on systems that are out of service. Test signal power levels greater than 0 dBm0 will not be applied to operational channel systems under any circumstances, except for conducting the Impulse Noise and Voice Channel Crosstalk Tests as noted in tables T2.

The standard monitor test tone power level to be used on voice frequency type GIG facilities when testing on an indefinite basis will be dBm0. Composite data signal power levels for operation over communications circuits, links, equipment, etc.

These include all tone signals including modulation products used to transmit data information over GIG voice frequency channels, whether the signal is a single tone or multiple tones, or whether the information is record traffic, computer-to-computer, or secure voice communications.

The standard composite data signal power level for operation in the GIG will be dBm0. The data level at the interface point of GIG and U. Therefore, the leasing authorities for the GIG and the commercial carriers must agree on the specific interface levels at the time of the lease.

The composite data level at the above points interfacing GIG Technical Control Facilities is dBm0 in both directions of transmission. Signal to C-Notched Noise Ratio 3 d. Maximum Charge in Audio Frequency 5 6, 7 g. C-Notched Noise dbrnc0 54 51 51 47 45 51 51 i.

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Directive In this document the. OPR: GE. For terms other than those defined below in this Circular, see reference 4. The specified maximum permissible change in the electrical performance parameters that indicate specific link and multilink performance from or between technical control facilities defined with reference to measured values of the same parameters made during a comprehensive alignment and maintenance overhaul, or from official subsystem acceptance test documents. For the purposes of this Circular, "end-to-end" is defined as a circuit from one user or terminal point to the other user s or terminal point s as established by the Telecommunications Service Order TSO.

6EP1437 1SH01 PDF

Technical Control Facility Technician II

Here are the instructions on how to enable JavaScript in your web browser. We're sorry but ClearanceJobs. We are actively searching for qualified candidates for this opportunity. We are currently identifying candidates for this effort. This requisition is contingent upon award of contract to Jacobs. This includes, but is not limited to, demand, routine and preventive maintenance, data entry, patch programming changes, telephone prefix and area code updates. Ensure all required critical and spare PLL parts recommended by the manufacturer or directed by the COR are identified for purchase and on hand.

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