Cabletron Systems SFCS-1000 User Manual
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:
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
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
(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
G.751, G.832, G.804