IBM Series 1 User Manual page 252

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TNL: GN34-0368 to GA34-0033-0 (February 4, 1977)
Figure 6-5. Output signal electrical circuit
DPC adapter
output driver
TTL open
collector
driver
Ground
Up level:
Down level:
Twisted-pair
cable
Recommended
termination
+5 volts
±
10%
150 ohms
±
5%
I - - -__
--i~
TTL load
300 ohms ± 5%
Ground
Impedance: 100 ohms
Maximum distance: 6.1 m (20 ft)
+2.4 volts minimum
leakage curren t
IL
=
40j..La maximum
@2.4V
+0.7 volts maximum
@ 175 rnA
Figure 6-6. Input signal electrical circuit
DPC adapter
input
termination
+5 volts
±
10%
150 ohms
±
10%
300 ohms
±
2.5%
Ground
Twisted-pair
cable
Impedance: 100 ohms
Maximum distance: 6.1 m (20
ft)
Recommended
customer driver
TTL open
collector driver
Ground
Down level
+0.6 V maximum
@42mA
customer
DPC
Adapter 6-13