.....Development of this record was to aid the assignment clerk to assign facility pairs without the use of schematics. all information is taken off the cable drawings and placed on the card by an engineer. The record card can also display cross connecting information.
.....This record is as flexible as each pyhsical cable pair is able to be spliced. At the same time it supplies all possible information which the service man can possibly need. An engineer can restrict pairs to appear only at terminals designed for their use while they may still appear at many other locations along the route from the central office.
.....Distribution cables are designed so as to dedicate a single pair for one party service from the subscribers address to the central office or to a cross connect point. Cross connect points are being stressed because the Express cables must be filled to the last pair, due to large investments. Cross connect points may furnish facilities for distribution cables by access to all spare pairs or by connections to individual station carrier channels. Distribution cables, some of which may be express cables in the future, must be engineered to always have spare pairs along its route.
.....In the distribution cable it must be possible for the combination man to pull a needed pair, (cut it and attach the drop) while identifying this pair without a mistake. It is possible to add additional MDF (split counts) to a distribution cable so as not to perform costly cable throws and still not make identification too difficult. 
.....This card can be overlayed onto the MDF record to display how each distribution pair is or is not used.

Three cards are displayed herein to describe their function.
Card 1 is below. Also See Card 2 or Card 3.

Make entries as follows:



ROUTE NUMBER, fill in Route name as well as the section of the route from terminal and thru terminal.
PAIRS - CABLE, Size and Gauge of cable between terminals
D STREET, name the cable runs along


ADDRESS, Street address of building or would-be building, the terminal is located by, front or back.
TERMINAL NUMBER, used in connection with the route name


LOADING OR TREATMENT, This small space is used as a reminder as to how many points the facility needs loading or if it is to require repeater or loop extending treatment. This applies only to circuits working on the physical basis. i.e. E7 = Extender w/ 7 loads
PAIR AT TERMINAL, This tells the color at the termina.
TZ, Record the actual number of times each pair is loaded before it reaches the limits of this card.
PAIR AT MDF,  The position on the Main Distribution frame at the central office.
DIAGONAL LINE, Place this line to note as to where these pairs also appear for use outside of the limits of this card.
SYMBOLS, as shown below are placed to show how each pair is used at each location. The "X" denotes the pair is cut and a drop to the subscriber is spliced to it.
Pair is cut and used from the left.
Pair is cut and used from the right.
Pair is cut and used from both directions.
Station Carrier connections, channels 3 and 7.
Pair is Loaded at this location
Pair has Build Out coil at this location
Pair is Repeatered at this location
.....Only those terminals which have a cable larger than one pair are shown on these type of records. Where a short piece of small count cable is used to extend services across a road, do not consider it as a distribution cable or place the cable on the cable records. A pair can be traced this short distance and the maintenance person can use the pairs as desired.

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