Jumpering a New Line

1

• Jumpering a New Line
• Providing a new line usually involves two
  jumpers, though some small exchanges may only
  require an MDF jumper.
• This page deals with jumpering in a UAX13 but
  other exchanges will be similar

Before jumpering a new line, in many exchanges it
is necessary first to disconnect the NU tone
jumpers from the "spare line number on the
"multiple" side of the IDF. Rearranging the NU
tone jumpers and strapping is usually very
tedious. More modern exchanges have final
selectors that can return NU tone should the
multiple number be left disconnected. In this
case much time is saved.
2

• In a UAX13, two jumpers have to be provided on
  the frames to connect up a new line.
• 1) A two wire MDF jumper between the cable pair
  serving the line and the protector serving the
  required multiple number.
• 2) A three wire jumper is provided on the IDF to
  connect the multiple number to the required
  linefinder outlet.

Record cards have to be updated within the
exchange. 1) The MDF jumper is recorded on the
A606 card which is in number order. Note that the
DP cards will also have to be completed so that
the full routing is available. 2) The IDF jumper
is recorded on the A737 card, which is in number
order and the A736 card which is in linefinder
bank outlet order. On the DFR these records are
also kept as Excel spreadsheets and so details of
changes to the records need to be advised to the
Recorder. Prints of the spreadsheets are made
available for use in the exchange. The
spreadsheets are also available on the telecoms
website so that ST can have up to date access to
them.
3

The A606 is basically a record of the MDF
jumpering. It also adds details of the circuit
destination.
4

The A737 describes the IDF jumper connecting the
multiple number to the line circuit. This sheet
is in numerical order.
5

The A736 describes the IDF jumper connecting the
multiple number to the line circuit. This sheet
is in line circuit order.