Internal Wiring Requirements; Norstar Loop; Isdn S Reference Point (S Loop) - Nortel ICS Install Manual

204 / Planning the installation
Tips -
the MICS 7.1 and MICS-XC 7.1 systems:
• two 2-port expansion cartridge system (four fiber ports
• a six-port and a two-port expansion combination
In a fully expanded system using 72 digital channels, consider
installing two service cartridges to prevent blocking of
incoming calls due to lack of DTMF resources, as there are
only four DTMF tone receivers per cartridge.

Internal wiring requirements

The following section describes the cable required for the
Norstar loop and an ISDN S reference point S loop.

Norstar loop

one, two or three twisted pair cables per telephone
å
dc loop resistance of less than 64 Ω
å
cable length (0.5 mm or 24 AWG) less than
å
300 m (1000 ft.)
use of a station auxiliary power supply (SAPS) for loops
å
300 m (1000 ft.) to 790 m (2600 ft.). The SAPS must be a
Class 2 power source that is UL listed and CSA certified.
å no bridge taps

ISDN S reference point (S Loop)

å no longer than 1000 m (3,200 ft.) for point to point
no longer than 450 m (1,475 ft.) on a point-to-multipoint
å
extended passive bus
Modular ICS 7.1 Installer Guide
The following combinations are not supported with
total)
(eight fiber ports total)
N0130943 02