Technical Description and Installation Manual
GigaFlex
11
Element
Description
Gigabit Ethernet
LEDs
Four RJ45 Female connectors with integrated LEDs and two SFP cages
LED
Description
Connector overview
Green
Ethernet Act blinking:
340ms: 10H/10F
170ms: 100H/100F
84ms: 1000H/1000F
Yellow
100/1000Base-TX mode
SFP LEDs
1
Ethernet Act blinking for Port 1:
84ms: 1000H/1000F
2
Ethernet Act blinking for Port 2:
84ms: 1000H/1000F
Table 3-2. Integrated LEDs in Serial and Ethernet connectors.
3.3
GigaFlex Interface Description
3.3.1 SHDSL Interface
The GigaFlex models are available with 2 or 4 EFM-based SHDSL channels. Every channel can
operate independently or two and more interfaces can create a group. This process is called
bonding
. Up to two bonding groups can be created. A single SHDSL channel or a group of
channels carry useful data traffic, called
payload
.
The EFM acronym means Ethernet on a First Mile. The EFM-based SHDSL transceiver operates
as PHY (Physical Layer of OSI Model). Upper Layers of OSI Model forms data flow that should
be transmitted over physical media. The SHDSL transceiver encodes data flow using TC-PAM
(Trellis-Codded Pulse Amplitude Modulation) and sends a data flow to the receiving end over a
twisted copper pair cable.
3.3.1.1 Modulation and Data Rates
The GigaFlex firmware supports TC-PAM4/8/16/32/64/128 modulations. Here the digit means the
number of levels in a signal pulse. Less number of levels means more distance between them.
More distance between the levels means more immunity to any kind of noise.
From the other hand, a modulation with low number of signal levels carries less data bits per
single pulse. This means that high data rates are not available for modulations with low number
of signal levels.
Modulation
Levels
Normal Mode
Extended Mode
Rate Min
Rate Max
Rate Min
Rate Max
Data Rate [kbit/s]
TC-PAM4
4
N/A
N/A
3
39
’ 9
TC-PAM8
8
N/A
N/A
3
79
’0
TC-PAM16
16
3
60
3
119
’
TC-PAM32
32
12
89
3
159
0’
TC-PAM64
64
N/A
N/A
3
199
’
TC-PAM128
128
N/A
N/A
4
238
’
Table 3-3. Modulation, signal pulse levels and possible data rates.
The available data rate can be calculated as
Rate*64
, while formula
Rate*64kbps
+ 8kbps
will
calculate the speed on the wire, displayed in all statistical information of the GigaFlex models. As
it’s s ow i Table 3-3, the available modulation and data rates are dependent on the operational
mode. The GigaFlex models support two modes of operation: Normal and Extended.
Et er et
