Toshiba Strata DK40 - Cable Installation Test

Fault Finding Station Cable Continuity Check
9-6
Strata DK40 I&M Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Cable Installation Test
If cable voltmeter and ohmmeter tests are within limits, digital telephones, DDCBs, or DDSS
consoles may not operate.
➤ To perform the cable installation test
1. Cable runs for the above digital devices must be free of cable splits (single or double).
Test for and eliminate all cable splits.
2. Cable bridge taps – Digital telephones will not operate if cable runs contain any type
(short or long) of cable bridge. Test for and eliminate all cable bridges.
3. When installing the station cable, do not run parallel to and within 915 mm of an AC
power line. AC power lines should be crossed at right (90°) angles only. In particular,
avoid running station wire pairs near devices that generate electrical noise, such as
neon or fluorescent light fixtures.
4.
For DK40:
See Chapter 2 – DK40 Installation, Table 2-15 on Page 2-53. Verify that
your telephone is wired correctly (2-pair or External power) for the options it supports
(ADM, RPCI-DI, HHEU, DVSU, etc.)
Table 9-3 Station Cable Continuity Check for Digital Telephone Cables using Ohmmeter
From To
Vo lt ag ePair Wire Colour Pair Wire Colour
1AGreen
1
2 A Black open
1 B Red 2 A Black open
1 A Green 2 B Yellow open
1 B Red 2 B Yellow open
1 A Green 1 B Red 40 ohms
2
2 A Black 2 B Yellow 40 ohms
2
1
The green-red, black-yellow and white-blue measurements should be within 10% of each other.
2
This is the maximum allowable reading for all digital and electronic telephone cable runs except if
connecting an HDSS console to circuits 7 and 8 of a PEKU, then the maximum cable restriction is 20
ohms, not 40 ohms.