Loopback - HP 6600 Command Reference Manual
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Also See for 6600:
- Security configuration manual (559 pages) ,
- Configuration manual (236 pages) ,
- Installation and getting started manual (103 pages)
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Default
The framing format is CRC4 ADM for ATM E1 interfaces and ESF ADM for ATM T1 interfaces.
Views
ATM E1 interface view, ATM T1 interface view
Default command level
2: System level
Parameters
crc4-adm: Sets the ATM over E1 framing format to 4-bit cyclic redundancy check ATM direct mapping
(CRC4 ADM).
no-crc4-adm: Sets the ATM over E1 framing format to no-CRC4 ADM.
esf-adm: Sets the ATM over T1 framing format to extended super frame ADM (ESF ADM).
sf-adm: Sets the ATM over T1 framing format to super frame ADM (SF ADM).
Usage guidelines
ATM Direct Mapping (ADM) directly maps ATM cells transmitted over the E1/T1 line into E1/T1 frames.
This process is defined by ITU-T G.804 and ATM forum.
Examples
# Configure no-CRC4 ADM framing on ATM E1 interface 5/1/0.
[Sysname] interface atm 5/1/0
[Sysname-Atm5/1/0] frame-format no-crc4-adm
loopback
Use loopback to enable a specific type of loopback testing on an ATM E1/T1 interface.
Use undo loopback to disable the loopback testing that is being performed.
Syntax
loopback { cell | local | payload | remote }
undo loopback
Default
No loopback testing is enabled.
Views
ATM E1 interface view, ATM T1 interface view
Default command level
2: System level
Parameters
cell: Enables internal cell loopback testing (to check the physical state of the chips on the local side).
local: Enables internal loopback testing (to check whether the local chips are working properly).
payload: Enables external payload loopback testing (to check whether payload framing is normal).
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