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Motorola SG4-DRT-2X Installation Sheet

Motorola digital return transmitter installation sheet.
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STARLINE
®
SG4-DRT-2X
Installation Sheet 509978-001
®
The Motorola
Digital Return Transmitter (SG4-DRT-2X) implements Time Division
Multiplexing (TDM) to convert two, independent 5 to 65 MHz analog RF return-path signals,
into one digital optical signal within SG4000 optical nodes. This digital optical signal with 10-bit
resolution and 3.125 Gbps rate is suitable for optical transmission on the International
Telecommunications Union (ITU) grid to the GX2-DRR-2X Digital Return Receiver (DRR) where
the original analog return-path signals are recreated.
The transmitter is configured with an 8 dBm digital Distributed Feedback (DFBT) laser that is
thermally stabilized to minimize wavelength drift. Multiple ITU wavelengths are available
depending on specific link requirements. The specific ITU channel and frequency are stamped
on the label on each transmitter and are identified in the subsection SG4-DRT-2X Models at the
end of this document.
The SG4-DRT-2X transmitter features high-speed digital technology to achieve reliable return
path communications at greater distances. The system is completely scalable and can be
expanded from a single transmitter/receiver to groups of 4, 8, 16, 32, or 40 wavelengths over a
single fiber with the use of muxing and demuxing equipment. The system is compatible with
Motorola low-noise optical amplifiers (EDFAs), enabling network designs that cover large
geographical areas. Without amplification, the SG4-DRT-2X Dense Wave Division Multiplexing
(DWDM) digital return system is capable of achieving a link loss budget of 26 dB.
The system achieves superior noise power ratio (NPR) and dynamic range (DR) performance in
return path communications. The SG4-DRT-2X system is HMS compliant and features an
enable/fault LED to report local status information. The SG4-DRT-2X comes standard with
SC/APC optical connectors; E2000 adapters are optional.
To facilitate easy upgrades, the double-wide SG4-DRT-2X module has the same set-up levels as
the analog return transmitters and can accomplish any two-transmitter configuration using
only a single fiber.
Figure 1 illustrates a block diagram of the SG4-DRT-2X:
Figure 1
SG4-DRT-2X block diagram
Return
Channel
JXP
Coupler
Input B
5-65 MHz
Test
Input B
-20 dB
Return
Channel
Coupler
JXP
Input B
5-65 MHz
Test
Input B
-20 dB
TXF
EQ
Fiber
MR
TXF
EQ
Fiber
MR
A/D
Transmit
Signal
Mux
Processing
A/D
SG4-DRT-2X Installation Sheet
Laser
Optical
Test Point
Output
-3 Gbps
Laser
Laser
driver
TEC

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   Summary of Contents for Motorola SG4-DRT-2X

  • Page 1

    Multiple ITU wavelengths are available depending on specific link requirements. The specific ITU channel and frequency are stamped on the label on each transmitter and are identified in the subsection SG4-DRT-2X Models at the end of this document.

  • Page 2

    STARLINE Figure 2 illustrates the SG4-DRT-2X with the cover on (left) and cover off (right): Figure 2 SG4-DRT-2X transmitter CH A CH B -5 dBmV -5 dBmV NOMINAL NOMINAL TOTAL POWER TOTAL POWER A / D A / D INVISIBLE LASER RADIATION.

  • Page 3

    Table 1 identifies and provides information on the user-interface features of the SG4-DRT-2X: Feature Description This test point enables monitoring of the optical output level of the module. 0.5 V/mW The nominal scale factor is 0.5 V/mW. Note that the optical power test point does not track changes in optical power due to the laser tracking error.

  • Page 4

    Installation Sheet). You may place a single transmitter in optics slots 3 and 4 or 5 and 6 in the SG4000 lid. Dual SG4-DRT-2X transmitters support split return redundant and segmented configurations. The dual transmitters occupy slots 3 and 4 and 5 and 6 in the SG4000 lid.

  • Page 5

    Tighten the three 1/4 inch mounting bolts to 8 – 12 in/lbs to secure the module in the SG4000 lid. Repeat as required for a second SG4-DRT-2X. Figure 5 illustrates a properly installed and cabled SG4-DRT-2X: Figure 5 SG4-DRT-2X installed in SG4000...

  • Page 6

    3. The 2X redundant return configuration board, in location 2, directs RF to CH B of the SG4-DRT-2X. The 2X redundant return configuration board, in location 3, directs RF to CH A of the SG4-DRT-2X. The same configuration board is used in the split redundant return configuration explained in the next subsection.

  • Page 7

    2X redundant return board- signal flow To set up the split return option: Confirm that the SG4-DRT-2X is installed in lid optics slots 3 and 4, or 5 and 6. Confirm that a 2X redundant return board is installed in lid return configuration board locations 2 and 3 as illustrated in Figure 5.

  • Page 8

    Verify that the green LED ( illuminated to confirm enable status. Measure the RF power at each channels’ test point on the top of the SG4-DRT-2X. The test point is a −20 dB test point located after the JXP pad location and indicates the level into the transmitter.

  • Page 9

    CLASS 3B LASER PRODUCT. PRODUCT. ENABLE/FAULT ENABLE/FAULT -5 V/mW -5 V/mW 2X DIGITAL TRANSMITT ER 2X DIGITAL TRANSMITT ER CH A CH A CH B CH B STARLINE Port 4 Port 6 Split Redundant board location #2 SG4-DRT-2X Installation Sheet...

  • Page 10

    2X redundant return – signal flow To set up the split redundant return option: Confirm that SG4-DRT-2X transmitters are installed in lid optics slots 3 and 4, and 5 and 6. Confirm that a 2X redundant return board is installed in return configuration locations 2 and 3 as illustrated in Figure 8.

  • Page 11

    Verify that the green LED ( illuminated to confirm enable status. Measure the RF power at each channels test point on the top of each SG4-DRT-2X. The test point is a −20 dB test point located after the JXP pad location and indicates the level into the SG4-DRT-2X.

  • Page 12

    3. The segmented return board installed in return configuration location 2 directs RF to channels A and B on the SG4-DRT-2X located in lid optics slots 3 and 4. The segmented return board in return configuration location 3 directs RF to channels A and B on the SG4-DRT-2X located in lid optics slots 5 and 6.

  • Page 13

    Segmented return board – signal flow To set up the segmented return option: Confirm that dual SG4-DRT-2X return transmitters are installed in lid optics slots 3 and 4 and 5 and 6. Confirm that a segmented return board is installed in the return configuration locations 2 and 3 as illustrated in Figure 11.

  • Page 14

    Verify that the green LED ( illuminated to confirm enable status. Measure the RF power at each channels test point on the top of each SG4-DRT-2X. The test point is a −20 dB test point located after the JXP pad location and indicates the level into the SG4-DRT-2X.

  • Page 15: Specifications

    Specifications are valid over the given bandpass and operating temperature range of −40°F to +140°F (−40°C to +60°C). Specifications are stated typical unless otherwise noted, and are subject to change. Refer to the Motorola BCS web site or contact your account representative for the latest specifications.

  • Page 16

    SG4-DRT-2X-CH31 1552.52 SG4-DRT-2X-CH32 1551.72 SG4-DRT-2X-CH33 1550.92 SG4-DRT-2X-CH34 1550.12 SG4-DRT-2X-CH35 1549.32 SG4-DRT-2X-CH36 1548.51 SG4-DRT-2X-CH37 1547.72 SG4-DRT-2X-CH38 1546.92 SG4-DRT-2X-CH39 1546.12 SG4-DRT-2X Installation Sheet Model Wavelength (nm) SG4-DRT-2X-CH40 1545.32 SG4-DRT-2X-CH41 1544.53 SG4-DRT-2X-CH42 1543.73 SG4-DRT-2X-CH43 1542.94 SG4-DRT-2X-CH44 1542.14 SG4-DRT-2X-CH45 1541.35 SG4-DRT-2X-CH46 1540.56 SG4-DRT-2X-CH47 1539.77 SG4-DRT-2X-CH48 1538.98...

  • Page 17

    If You Need Help If you need assistance while working with the SG4-DRT-2X, contact 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 Motorola Online: http://businessonline.motorola.com The TRC is open from 8:00 AM to 7:00 PM Eastern Time, Monday through Friday and 10:00 AM to 5:00 PM Eastern Time, Saturday.

  • Page 18

    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. 2004.

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