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C-13
Hardware Specifications
C.2.6 34 Mbps E3 Module
The following specifications apply to network modules NM-2/E3C and
NM-4/E3C:
Description Specification
Port Capacity Two or four E3 ports per module
Data Rate 34.368 Mbps
Output Buffer 13,312 cell capacity
Media Coaxial
Max. Line Length ~450 ft
Connector BNC
Line Encoding HDB3
Framing Per ITU-T G.832 or G.751
Clock Accuracy ±20 ppm
Timing Primary and secondary 8kHz reference from
internal (default) or network
Loopbacks Transmit and receive loopbacks
Impedance 75 ohms nominal
Statistics/Alarms Line code violations (LCV), framing bit errors
(FER), P-bit and C-bit errors, header check
sequence (HCS) errors, cells received (RxCells),
cells transmitted (TxCells), signal/clock detec-
tion, code violations, bit errors, parity errors,
and AIS indication
Compliance ATM Forum AF-PHY-94-0406 R5, ITU-T G.703,
G.751, G.832, G.804