Inter-Tel AXXESS Manual page 254

Installation
® ®
INTER-TEL AXXESS
E. STATION LOOP RESISTANCE TEST
NOTE:
gauge cable, such as 22AWG. (For additional station cabling requirements, see
7.47 Perform the loop resistance test for each station cable individually.
1.
2.
3.
4.
5.
6.
Digital Phones And Single-line Stations
From KSU (EKSC) to Executone IDS or Wave Keysets
From KSU (EKSC) with 30V external power supply to Executone Keysets
From Chassis (DKSCs or DKSC-16s) to Digital Phones (Axxess
Standard, Associate, Executive, Professional, 8500, 8520, and 8560) or Digital Phones with
attached PC and Modem Data Port Modules or Mini-Direct Station Selection Units
From Chassis (DKSC-16s) with 30V external power supply to Digital Phones
From Chassis (DKSC-16s) with 36V external power supply to Digital Phones
From Modem Data Port Modules to single-line sets
From Chassis to Single-Line Adapters (SLAs)
From SLAs to single-line sets or playback devices
From Chassis (SLCs) to single-line sets or playback devices
From Chassis (SLC-16s) to single-line sets or playback devices
NOTE:
and Maintenance Manual.
Page 3-68
MANUAL VERSION 11.0 – May 2008
Do not use shielded cable. Longer loop lengths can be achieved by using heavier
With a U.S. system only, ensure that bridging clips have not been installed on the sta-
tion blocks and that the station instrument is not connected to the modular jack assem-
bly.
With a U.S. system, place a short across the BLACK/YELLOW wires (phones) or
RED/GREEN wires (single-line sets) on the modular jack assembly.
With a European system, place a short across the WHITE/BLUE wires (phones) or
BLUE/WHITE wires (single-line sets) on the line jack unit assembly.
With a U.S. system, at the MDF, measure the resistance across the TIP and RING wires
on the right (station) side of the station block.
With a European system, at the MDF, measure the resistance across the WHITE/BLUE
wires on the lower (station) side of the station block.
The reading should not exceed the limits (for 24AWG, level-1 or better/24 gauge thick-
ness or larger -- smaller number gauge = larger thickness) listed in the chart below. The
resistance values (in ohms) indicate loop measurements; the distance values (in feet/
meters) indicate the maximum one-way measurements from the equipment chassis. If
necessary, longer loop lengths can be achieved by using a heavier gauge cable, such as
22AWG (22 gauge thickness or larger -- smaller number gauge = larger thickness).
NOTE:
Excessive and/or improperly made connections increase the resistance of a
cable, which reduces the allowable cable run length.
Remove the short after the test is complete.
Repeat this test for each station cable.
With a U.S. system only, install bridging clips on the station blocks to complete the
cable connections.
For information about analog phone loop limits, see a version 7.0 or earlier Installation
®
Basic, Eclipse™ Basic,
Station Loop Resistance Test
page 3-17.)
Loop Limits
62 ohms/1200 ft (366 m)
103 ohms/2000 ft (609 m)
62 ohms/1200 ft (366 m)
108 ohms/2100 ft (640 m)
154 ohms/3000 ft (915 m)
195 ohms/3800 ft (1158 m)
128 ohms/2500 ft (762 m)
800 ohms/15560 ft (4742 m)
257 ohms/5000 ft (1524 m)
103 ohms/2000 ft (609 m)