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Appendix A: Meridian Modular Telephones Page 343 of 504
Telephones and Consoles Description, Installation, and Operation
Line engineering
Meridian Modular Telephones use twisted-pair wiring on transmission lines
selected by the rules given in “Digital telephones line engineering” on
page 289 &c. The maximum permissible loop length is 3500 ft. (915 m),
assuming 24 AWG (0.5 mm) standard twisted wire with no bridge taps. A
15.5 dB loss at 256 KHz defines the loop length limit (longer lengths are
possible, depending on the wire's gauge and insulation). The Meridian
Modular Telephones use a 6-conductor line cord (A0346862).
Table 53 gives detailed information on loop lengths.
Figure 58 on page 344 shows a simplified block diagram of the Meridian
Modular Telephone, MPDA and DLC.
Table 53
Loop lengths for digital telephones
NT8D02
PVC insulated cable (polyvinyl chloride)
22 or 24 AWG 0–3500 ft.
(0–1067 m)
26 AWG 0–2600 ft.
(0–793 m)
Note 1: No bridge taps or loading coils are allowed.
Note 2: Effect of line protector at MDF reduces loop length by 500 ft.
CAUTION
Damage to Equipment
Service Interruption
Use only the line cord provided with Meridian
Modular Telephones. Using a cord designed for other
digital telephones could result in damage to the cord
or a loss of set functionality.