Specifications

line preference features, the IST has outside line dial tone when users lift the handset.
You can assign outside line ringing to the station port for IST call answering purposes or
you can enable the ringing line preference feature for the station port. The intercom line
is available to an IST even though you have arranged it to have outside line access. After
going off-hook, IST users obtain intercom dial tone by performing a hookflash. To
perform a hookflash, they must press and release the hookswitch. This action either drops
the outside line (if no digits are dialed after lifting the handset) or places it on hold (if
digits were dialed) and provides intercom dial tone.
To Program: To assign a prime intercom or assign a prime line (prime line automatic),
1. Dial 53. “STATION FEATURES”
2. Dial 15. “PRIME LINE ”
3a. Assign prime line “PRIME LINE XX”
—Line port 1– 14 = Dial 01–14 or press A1–A14
—Line port 15, 16 = Dial 15, 16 or press B1, B2
—Line port 17–24 = Dial 17–24 or press HOLD then press A1–A8.
3b. Assign prime group, dial 51–54 for groups 1–4. “PRIME LINE GRP X”
3c. Assign prime intercom, Dial 50 for intercom line.“PRIME INTERCOM”
4. Select station ports (LED On = Feature Assigned)
—Station 10–57 = Dial 10–57 or press C10–C57.
5. Dial ✳ for next prime line, group, or intercom assignment
—OR—
press ✳✳for next station feature
—OR—
press ✳✳✳for configuration mode.
To enable idle line preference,
1. Dial 54. “STA/LINE CONFIG.”
2. Dial 7. “IDLE LINE PREF.”
3. Select line ports (LED On = Selected Port)
—Line port 1–14 = Dial 01–14 or press A1–A14
—Line port 15, 16 = Dial 15, 16 or press B1, B2
— Line port 17–24 = Dial 17–24 or press HOLD then press A1–A8.
4. Dial # when all line ports are selected.
5. Select station ports (LED On = Feature Assigned)
—Station 10–57: Dial 10–57 or press C10–C57.
6. Dial ✳ when all station ports are selected
—OR—
dial ✳✳for next station/line feature
—OR—
dial ✳✳✳for configuration mode.
DSU II Digital Telephone System IMI66–132
Programming The DSU II System 3 – 93