Circuit Rerouting

TM 11-5895-878-14&P

to the command headquarters, and/or high command

or portion of the circuit or system. The magnitude of

echelons, as directed.

failure will determine the degree of emergency attached

to each service interruption. A majority of the service

troubles encountered can be attributed to failure of a

3-18. Circuit Rerouting

minor item of in-station equipment; in this case, the

Circuit rerouting is normally accomplished on a planned

station personnel are able to restore service

(scheduled) basis on orders from DCA or ACC. System

expeditiously by patching in spare equipment or

planning and growth, circuit priorities, link or equipments

components. As soon as maintenance personnel repair

reliability, subscriber population density, party line or

or replace the failed items, the circuit is restored to its

command net configurations, and system maintenance

normal path. All troubles must be logged and reported,

may be major system operating factors which generate

but the use of installed spares need not be coordinated

circuit rerouting requirements. In addition, system or

with ACC prior to getting the circuits back in service.

equipment failures may necessitate emergency circuit

Any nonpatching type rerouting actions required to

rerouting.

restore service to less than highest priority critical

a. Normal Circuit Rerouting. All normal circuit

circuits must be first coordinated with or have the

rerouting requirements are determined by ACC or higher

approval of DCA or ACC.

authority and are primarily based on satisfying customer

demands or improving communication services in a

c. Catastrophic Failures.

The failure of link

particular area of the system. In the latter case, the

equipment, transmitters or multichannel equipments

determination or requirement is the result of study and

involving critical highest priority circuitry, either by error

analysis of system operating and service conditions.

or intent of man, or by natural forces, are considered

The information is taken from the daily technical control

catastrophic failures. Under these conditions, the

and maintenance logs and reports which are submitted

restoration of service to critical and high priority circuits

by all stations to satisfy system operating statistics, and

is of paramount importance. Of equal importance at this

record requirements at ACC and/or higher headquarters.

time is the need to notify ACC of the failure event, the

When a normal circuit rerouting requirements is

point of failure, extent of damage, estimate of work,

established, ACC issues the work directive which

equipment, and time involved in correcting the failure,

combines the information needed for a circuit activation

and what has been done or is being done to restore

and a circuit deactivation. The station supervisors verify

service.

Station supervisors and station technical

the details of the directive, check that all required

controllers immediately take action to reroute

equipments and/or facilities are available for use, and

predetermined critical and high priority circuits to the

schedule the work for completion. As soon as the work

maximum degree possible over available spares

is completed, and the circuit verified in service, the

wherever alternate routing links are available. As

station records are updated and details promptly

services are restored, DCA and ACC are notified. DCA

forwarded to ACC in order that the system master files

or ACC evaluates initial reports and all subsequent

and records can be maintained current at all times.

status reports and initiates necessary instructions to

station supervisors and technical controllers detailing

b. Emergency Circuit Rerouting.

Any circuit

additional circuits to be rerouted and routes to be used.

rerouting necessitated by system, equipment, or

DCA or ACC also indicates which, if any, lesser priority

facilities failure can be identified as an emergency

circuits will be preempted in order to maintain a

requirement.

Emergency circuit rerouting is

maximum service balance throughout the entire system

accomplished, insofar as possible, by temporary cord,

until the failures can be completely restored to normal

plug and jack patching arrangements at or through the

service.

Technical Control Facility using installed spare

equipments or channels to bypass the failed equip ment

Section V. QUALITY CONTROL TESTING

composite signal transmission level test will be run in

3-19. Introduction

service. The total peak distortion test may be run in-

a. In order to meet the requirements of the DCA

service or out-of-service.

and provide effective service, the technical control

facility must be operated and maintained in peak

(2) Out-of-Service Quality Checks. Out-of-

operating condition.

service checks require the release of the circuit by the

user. These checks verify the technical parameters of

b. In order to maintain the TCF in peak condition,

the circuit end-to-end. The procedures used to make

in-service quality checks, out-of-service quality checks,

out of service quality checks are the same as those

and communications equipment checks should be

used when DCA circuits are activated.

performed on a regularly scheduled basis.

(3) Communications Equipment.

Quality

(1) In-Service Quality Checks.

In-service

control testing is require on all operational and spare

checks are made on all channels within the P&T.

communications equipment and should be conducted on

Measurements are made on a high impedance bridging

a regularly

basis that will not effect user service.

Only the

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