| Section
| Date
| Issue
| Size
| Title
|
| 331-000-000 | 1974-05-01 | 19 | 41.07 KB | Numerical Index - Division 331 - Transmission and Noise Testing, Central Office PBX Customer Lines and Equipment |
| 331-000-000 | 1980-09-01 | 26 | 64.16 KB | Numerical Index - Division 331 - Transmission and Noise Testing, Central Office PBX Customer Lines and Equipment |
| 331-000-000SW A | 1977-06-01 | C | 39.53 KB | Numerical Index - Division 331 - Transmission and Noise Testing, Central Office PBX Customer Lines and Equipment |
| 331-001-011 | 1978-07-01 | 1 | 250.70 KB | Equipment Test List - Division 331 - Transmission and Noise Testing, Central Office PBX Customer Lines and Equipment |
| 331-100-100 | 1980-03-01 | 2 | 1.29 MB | Message Circuit and C-Notched Noise - General Information |
| 331-100-101 | 1973-09-01 | 2 | 1.12 MB | Impulse Noise - General Information |
| 331-200-100 | 1974-04-01 | 2 | 906.48 KB | Impulse Noise - Requirements and Measurement |
| 331-200-105 | 1975-11-01 | 1 | 1.75 MB | Impulse Noise - Trunks - Test Procedures and Investigation |
| 331-700-100 | 1970-07-01 | 1 | 805.06 KB | Cross-Office Noise - Testing Methods - General Description |
| 331-700-110 | 1970-08-01 | 1 | 137.47 KB | Cross-Office Noise - Testing Methods - Selecting a Sample |
| 331-700-130 | 1970-07-01 | 1 | 150.28 KB | Cross-Office Noise - Testing Methods - Test Equipment |
| 331-700-501 | 1970-07-01 | 1 | 611.19 KB | Cross-Office Noise - Testing Methods - Step-by-Step |
| 331-700-502 | 1970-09-01 | 1 | 634.24 KB | Cross-Office Noise - Testing Methods - Panel Offices |
| 331-700-503 | 1970-08-01 | 1 | 573.02 KB | Cross-Office Noise - Testing Methods - No. 1 Crossbar Offices |
| 331-700-504 | 1970-09-01 | 1 | 585.40 KB | Cross-Office Noise - Testing Methods - No. 5 Crossbar Offices |
| 331-700-505 | 1970-08-01 | 1 | 580.93 KB | Cross-Office Noise - Testing Methods - No. 1 ESS Offices |
| 331-701-500 | 1974-06-01 | 1 | 961.92 KB | Impulse Noise - Central Office Test Procedures and Investigation |
| 331-701-501 | 1970-07-01 | 1 | 973.73 KB | Battery Supply Noise - Procedures For Making and Evaluating Noise Measurements on Central Office Battery Supplies |
| 331-850-501 | 1967-07-01 | 4 | 523.44 KB | Noise Measurements on Two-Wire Subscriber Loops - Methods and Requirements - At Stations |
| 331-850-502 | 1975-04-01 | 1 | 4.32 MB | Methods For Identifying and Correcting Inductive Noise Troubles on Subscriber Lines |
| 331-850-505 | 1975-01-01 | 6 | 836.07 KB | Noise Measurements on 2-Wire Subscriber Loops - Methods and Requirements - At No. 5 Crossbar Central Offices |
| 331-850-506 | 1975-01-01 | 4 | 813.83 KB | Noise Measurements on 2-Wire Subscriber Loops - Methods and Requirements - At SXS Central Offices |