Installing the Cisco ONS 15454 SDH E1-75/120
Impedance Conversion Panel
Product Name: 15454E-E1-75BB=
This document contains a description of E1-75/120 conversion panel (“E1-75 Black Box”) features,
installation procedures, and technical specifications. Use this document in conjunction with the Cisco
ONS 15454 SDH Reference Manual and the Cisco ONS 15454 SDH Procedure Guide when working with
E1-75/120 conversion panels.
This document contains the following sections:
• E1-75/120 Impedance Conversion Panel Description, page 2
• E1-75/120 Impedance Conversion Panel Specifications, page 3
• Install the E1-75/120 Conversion Panel, page 4
• Install Ground and Cables, page 5
• Related Documentation, page 7
• Obtaining Documentation, page 7
• Obtaining Technical Assistance, page 8
• Obtaining Additional Publications and Information, page 10
This document contains the following procedures:
Install the E1-75/120 Conversion Panel, page 4
Install Cables with Molex 96-Pin LFH Connectors on 120-Ohm Side, page 6
Install Cables with 1.0/2.3 Miniature Coax Connectors on 75-Ohm Side, page 6
Replace Cables with 1.0/2.3 Miniature Coax Connectors on 75-Ohm Side, page 6
Note For information about circuits and card capacities, see the Cisco ONS 15454 SDH Reference Manual.
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E1-75/120 Impedance Conversion Panel Description
E1-75/120 Impedance Conversion Panel Description
The ONS 15454 SDH E1-75/120 impedance conversion panel provides front mount electrical
connection for 42 ITU-compliant, G.703 E-1 ports. It contains 84 1.0/2.3 miniature coaxial connectors
(42 for transmit, 42 for receive) to the client side and two 96-pin Molex type connectors to the FMEC
120-ohm side. Each of the 96-pin Molex type connectors connects 21 inputs and 21 outputs.
Transformers in the E1-75/120 conversion panel improve decoupling from DC voltages and
overvoltages. The E1-75/120 conversion panel is intended to be used in DDFs (digital distribution
frames), ETSI racks, and ANSI racks. If you want to use the E1-75/120 conversion panel in a rack other
than ETSI, remove the ETSI rackmount brackets shipped with the E1-75/120 and use the optional
19-inch/23-inch mounting bracket.
With the E1-75/120 conversion panel, each E1-42 port operates at 2.048 Mbps over a 75-ohm unbalanced
coaxial 1.0/2.3 miniature coaxial connector. Figure 1 shows the E1-75/120 faceplate.
Figure 1 E1-75/120 Conversion Panel Faceplate
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 22 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
Figure 2 shows the E1-75/120 with optional rackmount brackets installed.
Figure 2 E1-75/120 with Optional Rackmount Brackets
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19 to 23 in.
rackmount
bracket
Installing the Cisco ONS 15454 SDH E1-75/120 Impedance Conversion Panel
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ETSI
rackmount
bracket
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E1-75/120 Impedance Conversion Panel Description
You can install the E1-75/120 conversion panel in the ANSI or ETSI rack containing the
ONS 15454 SDH shelf or in a nearby rack. If you install the E1-75/120 conversion panel where a longer
cable is required, make sure that the total cable loss of the balanced 120-ohm cable and the unbalanced
75-ohm cable does not exceed the maximum allowed value. The E1-75/120 conversion panel enables the
use of 75-ohm interfaces on the client side with the E1-42 card that has 120-ohm interfaces.
Before you can install the E1-75/120 in the rack, install the type of rackmount brackets that is required
for the rack that you are using. Figure 2 shows an ETSI rackmount bracket and a 19-inch/23-inch
rackmount bracket. To install the E1-75 in a 23-inch rack, use the 19-inch/23-inch rackmount brackets
perpendicularly.
Figure 3 shows a block diagram of the E1-75/120 conversion panel.
Figure 3 E1-75/120 Conversion Panel Block Diagram
42 Channels
Transformer 1.26:1
120-Ohm
Symmetrical Signals
Transformer 1.26:1
42 Channels
75-Ohm
Unsymmetrical Signals
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E1-75/120 Impedance Conversion Panel Specifications
The E1-75/120 conversion panel has the following specifications:
• E1-75/120 input
–
Bit rate: 2.048 Mbps +/− 50 ppm
–
Line code: HDB-3
• E1-75/120 output
–
Bit rate: 2.048 Mbps +/− 50 ppm
–
Line code: HDB-3
• E1-75/120 electrical interface
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Install the E1-75/120 Conversion Panel
–
Connectors:
1.0/2.3 miniature coax connectors on 75-ohm side
Molex 96-pin LFH connectors on 120-ohm side (21 inputs and 21 outputs per connector)
–
Impedance tolerance: +/− 5%
Note See the cable loss specification of the E1-42 card for valid cable lengths. The E1-75/120 as a passive
device cannot amplify any singal and so cannot increase the possible cable length.
• Environmental
–
Operating temperature: –5 to +45 degrees Celsius (+23 to +113 degrees Fahrenheit)
–
Operating humidity: 5 to 95%, noncondensing
–
Power consumption: Not applicable; the E1-75/120 is a passive device.
• Dimensions
–
Height: 75 mm (2.95 in.)
–
Width: 535 mm (21.06 in.)
–
Depth: 221 mm (8.7 in.)
–
Weight: 2.15 kg (4.74 lb)
• Compliance
ONS 15454 SDH cards, when installed in a system, comply with these standards:
–
Safety: IEC 60950, EN 60950, UL 60950, CSA C22.2 No. 60950, TS 001, AS/NZS 3260
Install the E1-75/120 Conversion Panel
This section explains how to install the E1-75/120 conversion panel. You need an E1-75/120 conversion
panel if you want to convert the balanced 120-ohm interfaces of the E1-42 card and the corresponding
FMECs to unbalanced 75-ohm interfaces.
Note For more information about the E1-75/120 conversion panel, refer to the Cisco ONS 15454 Reference
Manual.
Step 1 Lift the E1-75/120 conversion panel to the desired rack position.
Figure 4 shows the rack-mounting for the E1-75/120 conversion panel.
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