Cisco ONS 15454 Procedure Manual page 54

NTP-A10 Route Electrical Cables
Use standard RG59 (735A) cable connected to the RG179 for the remainder of the cable run. When using
Step 3
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.
example of proper coaxial cable routing.
Figure 1-23 Routing Coaxial Cable (SMB EIA Backplane)
Tie-wrap
posts
Return to your originating procedure (NTP).
Step 4
Cisco ONS 15454 Procedure Guide, R4.0
1-54
Connector ends
B
Tie-wraps
Chapter 1 Install the Shelf and Backplane Cable
Figure 1-23 on page 1-54
A
shows an
March 2003