Cisco Laser Link Ancillary Modules 数据表
Laser Link Modular 1550 nm Transmitters
4
Specifications, continued
Externally Modulated Broadcast Transmitters (LEMT)
Premium
Standard
Standard
Industrial
Notes
Link Performance
(min)
Units
78 NTSC
64 PAL B/G
59 PAL D/K
78 NTSC
64 PAL B/G
59 PAL D/K
59 PAL D/K
40 NTSC
64 PAL B/G
59 PAL D/K
59 PAL D/K
CSO dBc
-67
-65
-70
-65
CTB dBc
-67
-65
-70
-65
XMOD dB
-67
-65
-70
-65
CNR dB
54.5
53.5
56.5
51.5
1,2
CNR (60Km)
dB
53
52
55
50
1,3,4
CNR
(100Km) dB
51 50 53 48 1,3,5
Notes:
1. Optical receiver equivalent input noise density is 8 pA/Hz
2. Transmitter followed by an optical attenuator followed by an optical receiver; attenuator is adjusted for 0 dBm received
1. Optical receiver equivalent input noise density is 8 pA/Hz
2. Transmitter followed by an optical attenuator followed by an optical receiver; attenuator is adjusted for 0 dBm received
optical power
3. Erbium Doped Fiber Amplifier (EDFA) noise figure 5.0 dB Maximum
4. Transmitter followed by EDFA, a single-mode fiber, an optical attenuator and optical receiver
5. Transmitter followed by an EDFA, a single-mode fiber, an EDFA, a single-mode fiber, an optical attenuator and optical
4. Transmitter followed by EDFA, a single-mode fiber, an optical attenuator and optical receiver
5. Transmitter followed by an EDFA, a single-mode fiber, an EDFA, a single-mode fiber, an optical attenuator and optical
receiver
Narrowcast transmitter (Forward and Return)
Distortion Performance
CNR (dB)
CSO (dBc)
CTB(dBc)
Notes
Forward (NT)
dBc
50
-59
-49
1,2,3
Return (NTR)
dBc
50
-49
-60
1,4,5
Notes:
1. Optical modulation depth = 10% per channel
2. Link budget of 18 dB: 4 passive 14 dB (60 km) standard fiber; Receiver: LLFR forward receiver
3. 8 channel CW measurement: channels 79-86
4. Optical path: 8 dB fiber, 6 dB passive, Receiver: ELLRR-S reverse receiver
5. 6 CW carriers: 7, 13, 19, 25, 31 and 37 MHz
1. Optical modulation depth = 10% per channel
2. Link budget of 18 dB: 4 passive 14 dB (60 km) standard fiber; Receiver: LLFR forward receiver
3. 8 channel CW measurement: channels 79-86
4. Optical path: 8 dB fiber, 6 dB passive, Receiver: ELLRR-S reverse receiver
5. 6 CW carriers: 7, 13, 19, 25, 31 and 37 MHz