Specifications

Section 1—Installation & Configuration Bulletin No. VVDED397044US R12/00

Trunk and Drop Cabling with Taps December 2000

Complete the network installation labeling by properly labeling each site’s

cabinet or enclosure, device mounting panel, and device.

Checking the Cable Installation

Inspecting the Cable Installation

Visually inspect the cable for the following points:

• The cable runs are consistent with the physical and electrical

protection requirement described in “Cable Routing Practices” on

page 19.

• The cable runs are consistent with the network cable routing illustrated

in Figure 16 on page 25.

• The tap at each end drop site on each section of the network has its

two internal termination jumpers connected. They are connected

between the two center posts and the W and B posts at the side of the

tap opposite from the trunk cable connection, as shown in Figure 19

on page 28.

• The tap at each in-line drop site has its two internal terminal jumpers

disconnected and removed, as shown in Figure 18 on

page 27.

• Service loops exist on the trunk cable at each tap, and on each drop

cable at the node device end of the cable.

• Adequate strain reliefs are installed on the cable at each drop.

• All identification labels are in place and properly marked.

Checking Cable Continuity

Before checking continuity, disconnect all network cable connectors from

the node devices. Leave the drop cable ground lugs connected to their

site panel grounds. Verify the cable’s end-to-end electrical continuity by

checking the following points, illustrated in Figure 23 on page 33:

• At any node device connector, measure the resistance between pins

2 and 3. This should range between 60 and 80 Ω, including the cable

wire resistance.

• At each node device connector, check for an open circuit between

pin 2 and pin 1. Then check between pin 3 and pin 1. An open circuit

should exist for both checks.