Chapter 8. Repeater Housings on a Repeatered Line

If route junctions are present along the cable, then it is advisable to adjust repeater section spacings to place repeater housings at the junctions. Otherwise, there is greater possibility of signal level differences from adjoining cable branches, which would contribute to crosstalk. If a "repeaterless junction" is necessary, T1 span pads may be used to equalize levels between branches. See Figure 9. Manufacturers of repeater housings typically offer several configurations depending on number of line repeater units in the "nest," whether there are attached stub cables, the length of such stubs, presence or absence of lightning protectors, etc. It often seems as though each repeater housing vendor has chosen to describe T1 pairs by different methods. Just be aware that in a single direction, the transmit pair from one repeater becomes the receive pair 6000 feet away. The east-west transmit is separate from the west-east transmit.