Brand: Motorola
Category: Networking
Document Type: Installation Guide
Language: EN
Installation Guide for PTP 400 and 600 SERIES
Uploaded: Nov. 21, 2025, 7:01 p.m.
Manual Publish Date: 2006-09-20
Warranty Information
Lightning damage is not covered under the Motorola Warranty.
This technical note provides detailed instructions for installing lightning arrestors to protect Motorola PTP 400 and 600 Series bridges. It covers recommendations for tower/mast and wall-mount installations, including specific guidance for bridges with T1/E1 connections. The document details recommended components, wiring procedures, and pre- and post-power testing steps to ensure proper setup and protection against lightning and electro-magnetic discharge (EMD). The Surge Arrestor (ALPU-ORT) is emphasized for all interface ports.
Troubleshooting and error codes
| CAT-5 Length meters | Resistance pins 4-7 ohms | Resistance pins 8-5 ohms | Resistance Table referenced to the RJ45 at the PIDU Plus |
| 0 | 0.0 | 2.3 | |
| 10 | 1.7 | 4.0 | |
| 20 | 3.4 | 5.7 | |
| 30 | 5.1 | 7.4 | |
| 40 | 6.8 | 9.1 | |
| 50 | 8.5 | 10.8 | |
| 60 | 10.2 | 12.5 | |
| 70 | 11.9 | 14.2 | |
| 80 | 13.6 | 15.9 | |
| 90 | 15.3 | 17.6 | |
| 100 | 17.0 | 19.3 |
| CAT-5 Length meters | Resistance pins 1&2, 3&6, 4&5 and 7&8 - ohms | Resistance pins 1&3 ohms | Resistance between pins 4&7 - ohms | Resistance Table referenced to the RJ45 at the PIDU Plus |
| 0 | 0.8 | 1.0 | 1.6 | |
| 10 | 2.5 | 2.7 | 3.3 | |
| 20 | 4.2 | 4.4 | 5.0 | |
| 30 | 5.9 | 6.1 | 6.7 | |
| 40 | 7.6 | 7.8 | 8.4 | |
| 50 | 9.3 | 9.5 | 10.1 | |
| 60 | 11.0 | 11.2 | 11.8 | |
| 70 | 12.7 | 12.9 | 13.5 | |
| 80 | 14.4 | 14.6 | 15.2 | |
| 90 | 16.1 | 16.3 | 16.9 | |
| 100 | 17.8 | 18.0 | 18.6 |
| CAT-5 Length meters | Resistance between pins 3&6, and pins 7&8 | Resistance between pins 1&2, and pins 4&5 | Resistance Table referenced to the RJ45 at the PIDU Plus |
| 0 | 0.8 | 1.3 | |
| 10 | 2.5 | 3.0 | |
| 20 | 4.2 | 4.7 | |
| 30 | 5.9 | 6.4 | |
| 40 | 7.6 | 8.2 | |
| 50 | 9.3 | 9.8 | |
| 60 | 11.0 | 11.5 | |
| 70 | 12.7 | 13.2 | |
| 80 | 14.4 | 14.9 | |
| 90 | 16.1 | 16.6 | |
| 100 | 17.8 | 18.3 |