8
T3 FIBER OPTIC LINE DRIVER
1. Specifications
T3 Electrical Interface
Transmission Rates:
44.736 Mbps
Impedance:
75
Ω
unbalanced
Zero Suppression:
B3ZS
Connectors:
(2) BNC
Fiberoptic Interface
Operating Wavelength:
MT619A-ST-R2: 850 nm (multimode);
MT618A-ST-R2: 1310 nm (single-mode)
Line Coding:
CDP
Connectors:
(2) ST
®
Typical Power:
See Table 2-1
Receiver Sensitivity:
See Table 2-1
Range:
See Table 2-1
Diagnostics
Loopbacks:
Local loopback (LLB), activated via front-panel slide switch;
Remote loopback (RLB), activated via front-panel slide switch
AIS Signaling:
Frequency of ±25 ppm is sent to the electrical interface at the local
unit in the event of an optical signal loss; when the electrical interface input level is
“LOW,” “All 1s” signaling is sent to the optical output
Alarm Relay Port
Connector: (1)
DB9 female
Alarms:
Major: T3 electrical input becomes lower than G.703 electrical levels, or bit
error rate at the fiberoptic interface is 10
-6
or worse; Minor: Alarm Indication
Signal (AIS) is received at the T3 electrical or fiberoptic interfaces
