Installation
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Page
3-68
Station Loop Resistance Test
E. STATION LOOP RESISTANCE TEST
NOTE: Do not use shielded cable. Longer loop lengths can be achieved by using heavier
gauge cable, such as 22AWG. (For additional station cabling requirements, see page 3-17.)
7.47 Perform the loop resistance test for each station cable individually.
1. 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.
2. 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.
3. 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.
4.
Remove the short after the test is complete.
5. Repeat this test for each station cable.
6. With a U.S. system only, install bridging clips on the station blocks to complete the
cable connections.
NOTE: For information about analog phone loop limits, see a version 7.0 or earlier Installation
and Maintenance Manual.
Digital Phones And Single-line Stations Loop Limits
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
®
Basic, Eclipse™ Basic,
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
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)
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