A-2
A
PPENDIX
A: T
ECHNICAL
S
PECIFICATIONS
to cause harmful interference in which case the user will be required to
correct the interference at their own expense.
Interface
Specifications
Serial Port (RS-232 CH1 and CH2)
RS-232 CH1 and CH2 Cable Specifications
Token Ring (STP Connector)
Electrical Specification:
RS-232, 8-position modular jack
(EIA/TIA-232-E Standard)
Connector:
Modular Jack:
Stewart 88-360808 or equivalent
Configuration:
Data Terminal Equipment (DTE)
Transmission Method:
Unbalanced RS-232
Transmission Rate:
57.6 Kbps maximum
Wire Type:
Belden 9538 or equivalent, 8 conductor, shielded
Maximum Cable Distance:
50 Feet, 15 Meters
Nominal Direct Current
Resistance:
Center Conductor:
■
24 gage (7strand 32 gage)
■
.61 millimeter diameter
■
23.7 ohms/1000 feet
■
77.8 ohms/kilometer
Shield:
■
15.5 ohms/1000 feet
■
50.9 ohms/kilometer
Nominal Outside Diameter:
.265 inch; 6.73 millimeter
Capacitace Between
Conductors:
30 picofarads/feet; 98 picofarads/meter
Cabling:
8-position modular jack to DB-25 (IBM AT pin-out.
Electrical Specification:
IEEE 802.5
Connector:
DB-9, AMP 747844-3
Accessing Scheme:
Token Passing
Topology:
Star Wired Ring
Maximum Nodes for
Physical Network:
250
