MA365 • Rev. A2
55
Tellabs
®
6325 Edge Node
3 Reference Information
3.5.2
PDH Electrical Interfaces
2 Mbit/s input port
The following table shows the specifications for the electrical input ports at
reference point ER.
2 Mbit/s output port
The following table shows the specifications for the electrical output ports at
reference point ES.
Parameter
Value for 2 Mbit/s tributary input ports
Interface
• Coaxial pair - 75 Ohm (with external balun)
• Symmetrical pair - 120 Ohm
Bit rate
2.048 Mbit/s +/- 50 ppm
Code
HDB3
Jitter and wander toler-
ance
Figure 13 /G.823
Over voltage protection ITU-T K.20
Return loss
• >12 dB @ 51-102 kHz
• >18 dB @ 102-2048 kHz
• >14 dB @ 2048-3072 kHz
√
f attenuation
6 dB @ 1.024 MHz
SIR
18 dB
Grounding of outer
conductor / screen
Only connection of outer conductor to ground is
supported.
Parameter
Value for 2 Mbit/s tributary output ports
Interface
• Coaxial pair - 75 Ohm (with external balun)
• Symmetrical pair - 120 Ohm
Bit rate
2.048 Mbit/s +/- 50 ppm
Code
HDB3
Jitter generation (Map-
ping)
• 20 Hz - 100 kHz: 0.25 UI
pp
• 700 Hz - 100 kHz: 0.075 UI
PP
Jitter generation (Com-
bined)
• 20 Hz - 100 kHz: 0.4 UI
pp
• 700 Hz - 100 kHz: 0.075 UI
PP
Over voltage protection ITU-T K.20
Return loss
• >6 dB @ 50-100 kHz (Coaxial pair - 75 Ohm)
• >8 dB @ 100-3000 kHz (Coaxial pair - 75 Ohm)
• >10dB @ 50-3000 kHz (Symmetrical pair - 120
Ohm)
Содержание 6325
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