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1.888.225.3999         FrillFreePhones

an AbleComm website.
Quality, Service, Value - since 1977.
Home > 1A2 phones & parts > Info center

Info center

Info center

1A2 Technology
1A2 Technology
1A2 Advantages
1A2 Advantages
What killed 1A2?
What killed 1A2?
Phone System Evolution
Phone System Evolution
What about 1A3?
What about 1A3?
ITT Terryphone: fancy 1A2
ITT Terryphone: fancy 1A2
1A2 Key Service Units
1A2 Key Service Units
ITT 1978 Key System Guide
ITT 1978 Key System Guide
Valuable info for the vintage telecom fan.
Stromberg-Carlson<br>1979 Key System Catalog
Stromberg-Carlson
1979 Key System Catalog
More about 1A2 key systems.
Bell's Key System Manual, Vol. 1
Bell's Key System Manual, Vol. 1
ITT-Kellogg 1958 1A1 catalog
ITT-Kellogg 1958 1A1 catalog
Pre-1A2, from when Barney installed phones.
ITT-Kellogg 1959 2-line & 3-line phones in 10 colors
ITT-Kellogg 1959 2-line & 3-line phones in 10 colors
ITT 1978 Telephone Catalog
ITT 1978 Telephone Catalog
Consumer and business telecom products.
line card types
line card types
2564 or 2565?
2564 or 2565?
25-pair  cable color codes
25-pair cable color codes
400D line card schematic
400D line card schematic
400E line card schematic
400E line card schematic
501 KSU schematic
501 KSU schematic
•
ITT 601 KSU instructions
4200A line card schematic
4200A line card schematic
1A2 power supplies
1A2 power supplies
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  • "mechanical hold"
    (not quite 1A2)
  • Same model number, different phone
  • Why call it a "key" system?
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