Verilink AS420 (34-00294) Product Manual Manual do Utilizador descarregar pdf (Página 12)

4 AS420 Reference Manual

Specifications

Generic Interface Requirements (120 Ω

Ω Ω

Ω and 75 Ω

ΩΩ

Ω)

E1 Interface

Line Rate: 2.048 Mbps (± 32 ppm)

Framing: ITU-T G.704 (with or without CRC-4) G.703

Line Code: HDB3

Input Level: E1 to 6 decibels

Pulse Width: 244 (± 41) nanoseconds at half amplitude

Pulse Afterkick: 10 to 30 percent of pulse peak

T1 Interface

Line Rate: 1.544 Mbps (± 32 ppm)

Framing: D4 or ESF

Line Code: AMI or B8ZS

Input Level: 0 to -36 decibels

Pulse Width: 344 (± 45) nanoseconds at half amplitude

Pulse Afterkick: 10 to 30 percent of pulse peak

120 Ω

Ω Ω

Ω Termination

Interface: RJ-48C

Impedance: 120 Ω, balanced

Output Level: 3.0 (± 0.3) volts (base-to-peak)

75 Ω

Ω Ω

Ω Termination

Interface: BNC - coax

Impedance: 75 Ω, unbalanced

Output Level: 2.37 (± 0.24) volts (base-to-peak)

E1 Equipment Interface

N×64 kbps rate... for unframed E1: N=32;

for framed E1 without CAS: N=1 to 31;

for framed E1 with CAS: N=1 to 15 and 17 to 31

120 Ω

Ω Ω

Ω Termination

Interface: RJ-48C

Impedance: 120 Ω, balanced

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