Tellabs 6325 - PDH Electrical Interfaces

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)