Intrabuilding and interbuilding length limitations :: | 9/55

| Maximum supportable length limitations are application and media dependent. Requirements

- The backbone length limitations include the total backbone channel length, including backbone cable, patch cords or jumpers, and equipment cables.
- When the horizontal cross-connect (HC) to intermediate cross-connect (IC) distance is less than maximum, the intermediate cross-connect (IC) to main cross-connect (MC) distance can be increased accordingly. However, the total distance from the horizontal cross-connect (HC) to the main cross-connect (MC) shall not exceed the maximum specified in column A below.

Recommendations

- To minimize cabling distances, it is often advantageous to locate the main cross-connect near the center of a building or site.
- Cabling installations that exceed the standards distance limits may be divided into areas, each of which can be supported by backbone cabling within the scope of the standards.
- The length of category 3 multipair 100 Ohm backbone cabling, that supports applications up to 16 MHz, should be limited to a total of 90 m (295 ft).
- The length of category 5e multipair 100 Ohm backbone cabling, that supports data applications up to 100 MHz, should be limited to a total distance of 90 m (295 ft).
- The 90 m (295 ft) distance allows for an additional 5 m (16 ft) at each end for equipment cables (cords) connecting to the backbone.
- The 90 m (295 ft) distance limitation assumes uninterrupted cabling runs between cross-connects that serve equipment (i.e., no intermediate cross-connect).

Media Type | A | B | C
100 Ω cabling | <>800 m (2624 ft) | 300 m (984 ft) | 500 m (1640 ft)
62 µm cabling | 2000 m (6560 ft) | 300 m (984 ft) | 1700 m (5575 ft)
50 µm cabling | 2000 m (6560 ft) | 300 m (984 ft) | 1700 m (5575 ft)
singlemode | 3000 m (9840 ft) | 300 m (984 ft) | 2700 m (8855 ft)

- The maximum length of cross-connect jumpers and patch cords in the main and intermediate cross-connections should not exceed 20 m (66 ft).
- The maximum length of cable used to connect telecommunications equipment directly to main or intermediate cross-connections should not exceed 30 m (98 ft).

Intrabuilding and interbuilding length limitations :: | 9/55