Electrical Interface Assemblies - Cisco ONS 15454 Series Reference Manual

Multiservice provisioning platforms; shelf and backplane hardware

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Table Of Contents

Table of Contents

ONS_15454_Reference_Manual_R8.5.x_--_Shelf_and_Backplane_Hardware

forth). As you face the rear of the ONS 15454 shelf assembly, the right side is the A side and the left side is

the B side. The top of the EIA connector columns are labeled with the corresponding slot number, and EIA

connector pairs are marked transmit (Tx) and receive (Rx) to correspond to transmit and receive cables.

Note: For information about EIA types, protection schemes, and card slots, see Card Protection.

EIA Installation

Optional EIA backplane covers are typically preinstalled when ordered with the ONS 15454. A minimal

amount of assembly might be required when EIAs are ordered separately from the ONS 15454. If you are

installing EIAs after the shelf assembly is installed, plug the EIA into the backplane. The EIA has six

electrical connectors that plug into six corresponding backplane connectors. The EIA backplane must replace

the standard sheet metal cover to provide access to the coaxial cable connectors. The EIA sheet metal covers

use the same screw holes as the solid backplane panels, but they have 12 additional 6-32 x 1/2 inch Phillips

screw holes so you can screw down the cover and the board using standoffs on the EIA board.

When using the RG-179 coaxial cable on an EIA, the maximum distance available (122 feet [37 meters]) is

less than the maximum distance available with standard RG-59 (734A) cable (306 feet [93 meters]). The

maximum distance when using the RG-59 (734A) cable is 450 feet (137 meters). 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 RG-179, the attenuation rate is 59 dB/kft at 22 MHz.

•

For RG-59 (734A) the attenuation rate is 11.6 dB/kft at 22 MHz.

EIA Configurations

Table 1-1 shows the EIA types supported only by ONS 15454 shelf assembly 15454-SA-ANSI.

Table 1-1: EIA Types Compatible with the 15454-SA-ANSI Only

EIA

Cards

Type

Supported

DS-3

24 pairs of

BNC

DS3XM-6

BNC

EC-1

connectors

High-

DS-3

48 pairs of

Density

DS3XM-6

BNC

EC-1

connectors

SMB

DS-1

84 pairs of

SMB

DS-3

connectors

EC-1

DS3XM-6