1-54
Cisco ONS 15454 Procedure Guide, R4.0
March 2003
Chapter 1 Install the Shelf and Backplane Cable
NTP-A10 Route Electrical Cables
Step 3 Use standard RG59 (735A) cable connected to the RG179 for the remainder of the cable run. When using
a 10-foot (3.05 m) section of the RG179, you can attach a maximum length of 437 feet (133 m) of RG59
(735A). When using a 30-foot (9.1 m) section of RG179, you can attach a maximum length of 311 feet
(94.8 m) of RG59 (735A).
When using the RG179 cable, the maximum distance available (122 feet, 37.2 m) is less than the
maximum distance available with standard RG59 (735A) cable (306 feet, 93.3 m). The maximum
distance when using the RG59 (734A) cable is 450 feet (137.2 m). The shorter maximum distance
available with the RG179 is due to a higher attenuation rate for the thinner cable. Attenuation rates are
calculated using a DS-3 signal:
• For RG179, the attenuation rate is 59 dB/kft (dB per kilo-foot) at 22 MHz.
• For RG59 (735A), the attenuation rate is 23 dB/kft at 22 MHz.
Use a figure of 5.0 for total cable loss when making calculations. Figure 1-23 on page 1-54 shows an
example of proper coaxial cable routing.
Figure 1-23 Routing Coaxial Cable (SMB EIA Backplane)
Step 4
Return to your originating procedure (NTP).
B
A
Connector ends
Tie-wrap
posts
32079
Tie-wraps
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