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Motorola SG2-DRT-3X Installation Sheet

Motorola digital return transmitter installation sheet.
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STARLINE
®
SG2-DRT-3X
Installation Sheet 494828-001
This Installation Sheet describes the procedure for installing the SG2-DRT-3X in the SG2440 or
SG2000 node.
The Motorola
Digital Return Transmitter (SG2-DRT-3X) converts three independent 5 to
®
42 MHz analog RF return-path signals into one digital optical signal within the SG2000 and
SG2440 nodes. This digital optical signal, with 10-bit resolution and 3.1 Gbps rate, is suitable
for optical transmission to the GX2-DRR-3X Digital Return Receiver (DRR) where the original
analog return-path signals are recreated.
The transmitter is factory-configured with either a dense wave division multiplexing (DWDM)
laser on the International Telecommunications Union (ITU) grid or a coarse wave division
multiplexing (CWDM) laser that is applicable to the required link. Motorola provides standard
models that are identified in the subsection SG2-DRT-3X Models at the end of this document.
The specific wavelengths are stamped on the label of each transmitter.
An Automatic Power Control (APC) system regulates the optical output power from the laser.
The unit provides automatic gain control (AGC) and requires no adjustment. The SG2-DRT-3X
features alarm LEDs to report local status information.
To facilitate easy upgrades, the SG2-DRT-3X has the same set-up levels as the analog return
transmitters. The double-wide module occupies the same locations as the two analog
transmitters in the node lid. The SG2-DRT-3X generates its own 5 V power and works with a
single SG2-PS2 or SG2-PS power supply.
In addition to this Installation Sheet, the SG2440 Telecommunications Optical Node
Installation and Operation Manual and the SG2000 Telecommunications Optical Node
Installation and Operation Manual are required to install the SG2-DRT-3X. If you do not have
these documents, you can obtain them at the Motorola Web site.
Before you begin using this Installation Sheet, familiarize yourself with the stylistic conventions
used in this document:
Denotes silk-screening on the equipment, typically representing input/output (I/O) and power
SMALL CAPS
supply connections
Indicates that several versions of the same model number exist and the information applies to all
*
(asterisk)
models; when the information applies to a specific model, the complete model number is given
Before You Begin
Before you install the SG2-DRT-3X, verify that you have received the SG2-DRT-3X-CH*Kit,
part number 498284-TAB.
SG2-DRT-3X Installation Sheet

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   Summary of Contents for Motorola SG2-DRT-3X

  • Page 1: Related Documentation, Document Conventions

    To facilitate easy upgrades, the SG2-DRT-3X has the same set-up levels as the analog return transmitters. The double-wide module occupies the same locations as the two analog transmitters in the node lid. The SG2-DRT-3X generates its own 5 V power and works with a single SG2-PS2 or SG2-PS power supply.

  • Page 2

    STARLINE Figure 1 illustrates a block diagram of the SG2-DRT-3X: Figure 1 SG2-DRT-3X block diagram LF pilot generator 5-42 MHz 42 MHz Gain attenuator block LF pilot generator 5-42 MHz 42 MHz Gain attenuator block LF pilot generator 5-42 MHz...

  • Page 3

    The SG2440 carries each RF return path individually to the lid board and no adjustments to the electronics package (E-pack) are necessary. Before you install the SG2-DRT-3X in the SG2440, you must configure the node with the SG2440 DR-3X board. In this configuration, the RF return signals from RP1 and RP3 are combined and placed onto the D-subconnector beneath the double-wide transmitter module.

  • Page 4

    Figure 3 illustrates a block diagram of the SG2440-DR-3X return configuration: Figure 3 SG2440-DR-3X return configuration E-PACK Figure 4 illustrates the SG2440-DR-3X return board: Figure 4 SG2440-DR-3X return board SG2-DRT-3X Installation Sheet PLUG-IN BOARD D sub location 3.5 dB DRT1 DRT1 (MCX) 3.5 dB...

  • Page 5

    Review return-path system levels: Each input of the SG2-DRT-3X is configured to drive the laser to the recommended level of +15 dBmV. Use TP DRT1 and TP DRT2 (Figure 5) to monitor the levels of the segmented ports. Pad DRT1 and pad DRT2 are used to adjust the level into the transmitter.

  • Page 6

    Close the housing and use a torque wrench to progressively tighten the housing bolts to a final torque of 12 ft-lbs. in the sequence stamped on the housing lid. Figure 6 illustrates a properly installed and cabled SG2-DRT-3X: Figure 6...

  • Page 7

    Installing the SG2-DRT-3X in the SG2440 Node in a 1X or 2X Configuration The SG2-DRT-3X transmitter can operate with three data streams. If you install the SG2-DRT-3X in an SG2440 that will remain a combined (1X) or split (2X) return, an additional cable is provided to properly load the transmitter.

  • Page 8

    STARLINE To use the SG2-DRT-3X, the SG2000 must be equipped with the ICS plug-in board. The circuitry on this assembly contains 9 dB of attenuation to ensure proper levels into the transmitter input. Figure 8 illustrates the ICS board: Figure 8...

  • Page 9

    To install the SG2-DRT-3X in the SG2000 node: If present, remove any analog transmitter that occupies the optical transmitter B or A positions as illustrated in Figure 9, and then install the double-wide SG2-DRT-3X: Figure 9 SG2000 optical transmitter B and A locations...

  • Page 10

    STARLINE Figure 10 illustrates the SG2000 equipped with an SG2-RPM/C, the E-pack cover removed, the ICS locations, proper cable routing and installed SG2-DRT-3X: Figure 10 SG2-DRT-3X installed in SG2000 Install an SG2-DR-3X input board in each selected ICS location. The ICS locations on the left are for ports 1 and 3 and the locations on the right are for ports 2 and 4.

  • Page 11

    Review return-path system levels: Each input of the SG2-DRT-3X is configured to drive the laser to the recommended level of 15 dBmV. If available, use a test adapter cable to measure levels directly at the SG2 ICS board assembly.

  • Page 12: Specifications

    Power consumption 0.6 amps worst case Operating temperature range 40 C to 85 C Storage temperature range 40 C to 85 C Dimensions 3.5” (H) Weight 1.8 lbs SG2-DRT-3X DWDM Models Model ITU Frequency (THz) SG2-DRT-3X-CH20 192.000 SG2-DRT-3X-CH21 192.100 SG2-DRT-3X-CH22 192.200 SG2-DRT-3X-CH23 192.300...

  • Page 13

    SG2-DRT-3X-1550c SG2-DRT-3X-1570c SG2-DRT-3X-1590c SG2-DRT-3X-1610c If You Need Help If you need assistance while working with the SG2-DRT-3X, call the Motorola Technical Response Center (TRC): Inside the U.S.: 1-888-944-HELP (1-888-944-4357). Outside the U.S.: 215-323-0044 Online: http://broadband.motorola.com/noflash/websupport.html. The TRC is open from 8:00 AM to 2:00 AM Eastern Time, Monday through Friday and 10:00 AM to 5:00 PM Eastern Time, Saturday.

  • Page 14

    This is a class 1 product that contains a class IIIb laser and is intended for operation in a closed environment with fiber attached. Do not look into the optical connector of the transmitter with power applied. Laser output is DANGER invisible, and eye damage can result.

  • Page 15

    FCC Declaration of Conformity International Declaration of Conformity Motorola, Inc. 101 Tournament Drive Horsham, PA 19044, U.S.A. Model SG2-DRT-3X EN50083-2 CISPR-22 EN60950 IEC 60950 + A1: 1992 + A2: 1993 + A3: 1995 + A4: 1996 Low Voltage Directive 73/23/EEC...

  • Page 16

    MOTOROLA, the Stylized M Logo and STARLINE are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners.  Motorola, Inc. 2003. All rights reserved. 494828-001 No part of the contents of this manual may be reproduced or transmitted in any form or by any means without the 5/03 written permission of the publisher.

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