Zte ZXG10-OB06, Техническое руководство

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ZXG10-OB06 (V1.0) Integrated Outdoor GSM Base Station Technical Manual
22 Confidential and Proprietary Information of ZTE CORPORATION
Interface Specifications
Abis Interface
Abis interface adopts the standard E1 interface and meets the
requirements specified by ITU-T G.703 and ITU-T G.704. Table 8 shows
the basics of Abis interface.
T
A B L E
8 – A
B I S
I
N T E R F A C E
B
A S I C S
Prerequisites Values
Nominal bit rate 2048 Kbps
Bit rate error tolerance ±50×10
-6
Signal code pattern HDB3
Table 9 shows the electrical features of Abis Interface.
T
A B L E
9 – A
B I S
I
N T E R F A C E
E
L E C T R I C A L
F
E A T U R E S
Electrical Features Values
Pulse shape Rectangle
Nominal pulse width 244 ns
Nominal peak voltage of pulse
(mark) • 2.37V (75 ohm, a pair of coaxial cables)
• 3 V (120 ohm, a pair of symmetrical cables)
Peak voltage when without
pulse (vacant number) • 0±0.237V (75 ohm, one pair of coaxial cables)
• 3 V (120 ohm, one pair of symmetrical cables)
Amplitude ratio between
positive and negative pulse • At midpoint of pulse width: > 0.955 ~ 1.05
• At half of nominal pulse amplitude: > 0.95 ~ 1.05
Digital signal jittering features
(1 UI = 488 ns) • 1.5 UI (peak-peak value, 20 Hz ~ 100 kHz)
• 0.2 UI (peak-peak value, 18 kHz ~ 100 kHz)
Input impedance features • 2.5% ~ 5% (when it is 51.2 Kbps ~ 102.4 Kbps,
echo attenuation is
≥ 12 dB)
• 5% ~ 100% (when it is 102.4 Kbps ~ 2048 Kbps,
echo attenuation is
≥ 18 dB)
•
100% ~ 150% (when it is 2048 Kbps ~ 3072
Kbps, echo attenuation is
≥ 14 dB)