Chapter 39 Hardware procedures 375
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Making a BITS wire
Make a BITS wire for the connection between the external timing source and
the BITS termination panel.
Prerequisites
• The BITS wire must be a braided shield, see “Making a braided shield”
(page 379).
• The BITS cable must be custom made before completing the end-to-end
timing connection.
• Match the wire gauge requirements for a BITS installation with the
requirements of your site BITS timing source. Also, the gauge of wire
depends on the distance between the endpoints and the capability to
solder the bare wire onto the pins of a DB9 connector.
• Each timing connection requires 2 wires. When connecting both the 0
and 1 timing references, select color-coded twisted pair wires to
distinguish between the 2 (this does not apply to E1 unbalanced
connections).
• Ensure that the size of wire (for example, 22 AWG) can be soldered to
the DB9 connector pins. The wire size depends on the length between the
end points.
• Cable length depends on the transmitter line build out and the gauge of
the cable. Refer to the table
“Typical line build out application settings”
(page 375).
Table 4
Typical line build out application settings
Gauge Distance Transmitter
0 0 to 41 m (133 ft) 0 db DSX-1/CSU
1 41 m (133 ft) to 81 m (266 ft) DSX-1
2 81 m (266 ft) to 122 m (399 ft) DSX-1
3 122 m (399 ft) to 163 m (533 ft) DSX-1
4 163 m (533 ft) to 200 m (655 ft) DSX-1
(Sheet 1 of 2)
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