Line Engineering; Accessory Environmental Information - Nortel Meridian SL-100 Reference Manual

11-2 Environmental and safety considerations
Table 11-2 Temperature and humidity
Storage:
Temperature range
Relative humidity

Line engineering

M3900 Series Meridian Digital Telephones use twisted pair wiring on
transmission lines. The maximum acceptable loop length is 1067 m. (3500 ft.),
assuming 24 AWG (0.5 mm) standard twisted wire with no bridge taps. A 15.5
vdB loss at 256 kHz defines the loop length limit. Longer lengths are possible,
depending on the wire's gauge and insulation.

Accessory environmental information

The following table provides specification and physical environmental
information for M3900 series accessories.
Meridian External Alerter and Recording Interface (MEARI)
The following table provides specification and physical environmental
information for the MEARI
Table 11-3 MEARI specifications (Sheet 1 of 2)
Ring relay contact
Call status relay contact
Record audio level (RJ12 jack)
Record audio level (3.5mm jack)
555-4001-136 Standard 04.02 May 2001
-50° to 70°C (-58° to
158°F)
5% to 95%
(noncondensing). At
temperatures above
34°C (93°F) relative
humidity limited to 53
mbar of water vapor
pressure.
WARNING
Use only the line cord provided with the telephone. A line
cord designed for another telephone can cause damage to
the equipment.
Normally open, max 50 mA 30 V
Normally open, max 50 mA 30 V
Nominal - 12dBm, 600 Ohm
Nominal - 52 dBu, microphone level