Nortel M2018, Справочное руководство

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2 Performance Specifications
555-4001-110 Standard 09.03 July, 2002
Loop engineering
The M2000 Digital Telephones operate at their full potential through
twisted-pair wiring where the maximum permissible loop length is less
than 3000 ft (915 m) of 24 AWG (0.5 mm) standard twisted wire with no
bridge taps.
The maximum loop length assumes no under-carpet cable, the
maximum allowable cable must be reduced using the following
equation:
LM = (14 - (UC x UL)) / 14
where
LM = loop length in ft (km)
UC = length of the under-carpet cable in ft (km)
UL = loss of the under-carpet cable in dB/ft (dB/km) at 256 kHz
Data characteristics
The MADO communicates with the Data Terminal Equipment (DTE)
using the characteristics listed in the following table;
Table 2 MADO Data characteristics
Characteristic Specification
Data type ASCII (ANSI standard
X3.4-1977)
Synchronization Asynchronous
Number of bits 7 bits plus parity or 8 bits, no
parity
Parity None, odd, or even
Data rate 110, 150, 300, 600, 1200, 2400,
4800, or 19200 bits per second
Stop bits 1 bit for all speeds