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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. Related Documentation 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. Document Conventions Before you begin using this Installation Sheet, familiarize yourself with the stylistic conventions used in this document: SMALL CAPS Denotes silk-screening on the equipment, typically representing input/output (I/O) and power 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 STARLINE Figure 1 illustrates a block diagram of the SG2-DRT-3X: Figure 1SG2-DRT-3X block diagram 42 MHz LPF Gain block Gain block Gain block Pin attenuator Pin attenuator Pin attenuator 42 MHz LPF 42 MHz LPF 5-42 MHz 5-42 MHz 5-42 MHz LF pilot generator LF pilot generator LF pilot generator Frame synchronization A/D converter 32:1 multi- plexer 3.1 GHz xoscillator Laser driver ITU laser Microprocessor ADC in DAC out A/D converter A/D converter Filter and clock driver RF detector RF detector RF detector Figure 2 illustrates the SG2-DRT-3X: Figure 2SG2-DRT-3X transmitter 12 34 OPTICAL POWER (1 V/mW) I N P U T I N P U T A B SG2-DRT-3X Digital Return Optical Transmitter ALARM F A U L T O N XXXXXX-XXX-XX XXXXXXXXXXX ITU/CH XX WAV XXXX.XX 5 SG2-DRT-3X Installation Sheet STARLINE Table 1 provides information on the user-related features of the SG2-DRT-3X: Key Feature Description 1 OPTICAL This test point enables monitoring of the optical output level of the module. POWER The nominal scale factor is 1.0 V/mW (6.3 V equates to 8 dBm). The optical (1 V/mW) power test point does not track changes in optical power due to the laser tracking error. 2 F A red (FAULT) LED indicates that the laser output power is below normal A U limits. LO TN A green LED (ON) indicates the transmitter is enabled. Because the laser output requires a short period of time to stabilize, it is ALARM normal for neither LED to illuminate for approximately 10 seconds. The module must be enabled for the fault indicator to function. 3 This MCX connector provides the SG2-DRT-3X with channel A RF input through a cable connection to the node lid board in an SG2440 or the E-pack I in an SG2000. N P U T A 4 This MCX connector provides the SG2-DRT-3X with channel B RF input through a cable connection to the node lid board in an SG2440 or the E-pack in an SG2000. N UP Channel C RF input is provided by direct connection of the node lid board T with the D-type connector on the bottom of the SG2-DRT-3X. B 5 This SC/APC type connector provides optical output from the SG2-DRT-3X. I Installing the SG2-DRT-3X in the SG2440 Node 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. The RF return signals from RP2 are routed to the MCX connector DRT1. The RF return signals from RP4 are routed to the MCX connector DRT2. RF cables are used to route the signal from DRT1 and DRT2 to the top of the transmitter to RF INPUT A and RF INPUT B respectively. If different combining scenarios are required, you may...