Motorola SG 2000 Betriebsanleitung PDF herunterladen (Seite 39)

Operation 5

-3

AT&T SLW2500 Installation and Operation Manual

SG2-DFBT Optical Transmitter

The SG2-DFBT is an isolated distributed feedback (DFB) return path optical transmitter used in

the SLW2500 node platform. It has a nominal optical output power of 1.0 mW and is used in

conjunction with an AM-RPR, AM-OMNI-RPR/2, or other similar return-path optical receiver.

Figure 5-2 illustrates the SG2-DFBT:

Figure 5-2

SG2-DFBT

LASER

CURRENT

(1 V/A)

OPT ICAL

POWER

(1 V/mW)

SG2000

Opt i cal Transmitter

ASSEMBLED

IN MEX ICO

SG2-DFBT

Table 5-3 provides information on the user-related features of the SG2-DFBT:

Table 5-3

SG2-DFBT features

Feature Description

Optical power test point This test point enables monitoring of the optical output level of the module.

The nominal scale factor is 1.0 V/mW. The optical power test-point voltage is

between 0.945 V through 1.055 V (optical power of 0.945 mW through 1.055

mW) when the module is enabled under normal operating conditions. Note

that the optical power test point does not track changes in optical power due

to the laser tracking error.

Laser current test point This test point enables monitoring of the current drawn by the laser diode. The

nominal scale factor is 1.0 V/A. The laser current test point voltage is between

5 mV through 110 mV (laser current of 5 mA through 110 mA) when the

module is enabled under normal operating conditions. The laser current is

expected to vary widely with changes in temperature, but should always

remain between the limits.

Transmitter enable A green LED that provides visual indication of the transmitter’s enable status.

Fault indicator A single red LED that lights if the hybrid current is outside the normal

operating range, the laser output power is below normal limits, or the laser

current is above normal limits. Because the laser output requires a short

period of time to stabilize, it is acceptable for the fault indicator to illuminate

during the stabilization interval (approximately 2 seconds). Note that the

module must be enabled for the fault indicator to function.

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