Chapter 1: Introduction
14
1.5.9 Power supply
Voltage (AC source) 100 ~ 240 VAC
Voltage (DC range 1) 18 ~ 36 VDC
Voltage (DC range 2) 36 ~ 72 VDC
Frequency 47 to 63 Hz for AC power
Power consumption 15 VA maximum
1.5.10 Environment
Temperature 0-50
o
C / 32-122
o
F
Humidity 0 to 90% non-condensing
1.5.11 Miscellaneous
MTBF 300,000 hours
Emission compliance meets FCC part 15 Sub B (class A)
EN55022:1994/A1:1995/A2:1997,
EN61000-3-2:1995, EN61000-3-3:1995,
and EN50082-1:1997
1.6 E1 Signal Structure
1.6.1 E1 link line rate
The E1 line operates at a nominal rate of 2.048Mb/s.
1.6.2 E1 link line coding
The basic E1 line signal is coded using either the Alternate Mark Inversion (AMI) or HDB3
rule. In the AMI format, "ones" are alternately transmitted as positive and negative pulses,
whereas "zeros" are transmitted as a zero voltage level. AMI is not used in most 2.048Mb/s
transmissions because synchronization loss occurs during long strings of data zeros.
In the HDB3 format, a string of four consecutive zeros is replaced with a substitute string of
pulses containing an intentional bipolar violation. The HDB3 code substitutions provide high
pulse density so that the receiving equipment is able to maintain synchronization with the
received signal.
When configured for E1, the 4-CHANNEL E1 Ports support one of two E1 line codes:
AMI coding.
HDB3 coding.
The 4-CHANNEL E1 Ports support only transparent unframed format. ie. The E1 will pass
through with its original framing structure completely intact.
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