ADTRAN MX3216, System Manual

Page: 25 / 190

Section 2, Engineering Guidelines - Fuse Recommendations
61189008L1-1B 2-5
FUSE RECOMMENDATIONS
Table 2-7 provides data for determining the recommended fuse for the fuse and alarm panel
that services the MX3 chassis.
DS3 CONNECTIONS
CAUTION
Do not connect DSX-1, DS3, or Ethernet circuits from the MX3216
directly to outside plant facilities.
Cable Specifications
NOTE
Connect DS3 interfaces using coaxial cables that have shields
grounded at both ends.
All coaxial cable for the MX3216 DS3 signals should meet the following minimum
specification:
• The coaxial cable should have characteristic impedance of 75 ohms.
• Nominal mutual capacitance should not exceed 20.4 pF/foot.
• The cable should conform to ANSI standard T1.102 (1993) pulse mask definition. The
standard reference cable is a “WECO Type 728A” at 450 feet.
Approved cable types include the following:
• WECO 728A
• Lucent 728B
• Lucent 734A
• Lucent 735A (maximum length of 250 feet)
• Belden 9231
• Belden 1809A
Table 2-7. Fuse Recommendations
System Voltage Recommended Fuse
–48 VDC 1.5 amps, slow-blow
±24 VDC 3.0 amps, slow-blow