Metrodata ATM CBR DSU, Руководство пользователя

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E3 CBR PORT CONFIGURATION
83 76-02-031E
11 E3 CBR PORT CONFIGURATION
11. 1 E3 Physical Interface
The signal is transmitted on 75 Ohm RG59 unbalanced coax terminated with BNC
connectors. HDB3 line coding is employed, per G.703 at 34
⋅
368 Mbit/s.
11. 2 E3 Physical Layer Framing
Framing is fixed to UNFRAMED . This means that the CBR port traffic will be emulated
across the ATM network at full bandwidth, irrespective of framing format.
11. 3 E3 WAN Set-up
The E3 port parameters are set using the path
MAIN SETUP/ WAN SET-UP
and then selecting the E3 interface from the two port identities displayed.
Figure 11.1 E3 Set-up
11 . 3. 1 Framing
E3 physical layer framing is fixed as UNFRAMED.
11 . 3. 2 Line Coding
LINE CODING is fixed with a value of HDB3 (High Density Binary 3).
11 . 3. 3 Timing
TIMING is used to select the clocking mode of the E3 port. This is fixed as THROUGH,
meaning that the ATM CBR DSU pair are transparent to clocking.
11 . 3. 4 AIS Detection
This option allows AIS detection to be ENABLED or DISABLED . The AIS detector should be
enabled under normal datacomms conditions, and only be disabled when there is a very low
density of zeros in the traffic.
E3 PORT
Framing Unframed
Line coding HDB3
Timing Through
AIS Detection Enabled