Page330 of 544 EuropeanDigital telephones: 3110, 3310, and 3820
553-3011-100 Standard14.00 January 2002
EN 50081-1:1992 - Electromagnetic Compatibility - Generic emissions
standard. Generic standard class: Residential, commercial and light industry.
Line engineering
Meridian digital telephones use twisted pair wiring on transmission lines
selected by the rules. The maximum permissible loop length is 3500 ft.
(1067m), assuming 24 AWG (0.5 mm) standard twisted wire with no bridge
taps. A 15.5 dB loss at 256kHz defines the loop length limit. (Longer lengths
are possible, depending on the wire’s gauge and insulation.) Table100 gives
detailed information on loop lengths.
Note: Use only the line cord provided with the telephone. Using a cord
designed for another telephone could result in damage to the cord.
Local alerting tones
Each telephone provides four alerting tones and a buzz sound. The system
controls the ringing cadence by sending tone-ON and tone-OFF messages to
the telephone. The alerting tone cadences cannot be changed from the
telephone but can be altered for individual terminals by software controlled
adjustments in the system. See Administration (553-3001-311). All other
telephone tones, such as dial tone or overflow, are provided by the Meridian1
from a Tone and Digit Switch.
Table 1 00
Loop lengths for Meridian digital telephones
PVC insulated cable
(polyvinyl chloride) QPC578 A and B QPC578 C + NT8D02
22 or 24 AWG 100–3000 ft.
(30.5–915 m)
0–3500 ft.
(0–1067 m)
0–3500 ft.
(0–1067 m)
26 AWG 100–2100 ft.
(30.5–640 m)
0–2600 ft.
(0–945 m)
0–2600 ft.
(0–793 m)
Note 1: No bridge taps or loading coils are allowed.
Note 2: Effect of line protector at MDF re duces loop length by 500 ft.