Figure 4-12. Sample noise level trend analysis chart.

TM 11-5895-1012-10

the user until proper signal levels are

e. Figure 4-11 through 4-13 are examples of

by the

user. Actions of this nature will be properly docu-

typical graphs that may be used for trend analysis.

mented and immediately reported to the appropriate

4-52. Excessive Signal Levels

Docc and operation and maintenance activities.

Denial of service for this reason should be done

Frequently, excessive signal levels are introduced into

judiciously and then only with approval of the

the DCS from the user equipment. Excessive signal levels

Technical Control Facility shift supervisor. As a rule

from just a small number of users can cause crosstalk

of thumb, the following criteria may be applied:

across the baseboard of an entire system. Whenever

a. If the signal level is within 3 dB of the correct

excessive signal levels are detected, as a result of in-

level, the serving TCF should initiate normal coordina-

service quality control testing or as a result of a user

tion to correct the level.

complaint, immediate action will be initiated by the

b. If the signal level is between 3 dB and 6 dB above

technical controller to locate the source. The serving

the correct level, the user must correct the level within

TCF will immediately notify the violating user, direct

15 minutes or the TCF will deny service.

his attention to the provisions of established direc-

c. If the signal level is more than 6 dB above the cor-

tives, and request that immediate action be taken to

rect level, the TCF will immediately deny service until

correct the deficiency. If the user continues to violate

the user provides the correct level.

signal level limits, the serving TCF will deny service to

Figure 4-11. Sample distortion trend analysis chart.

EL3Z0048

Figure 4-12. Sample noise level trend analysis chart.