Spirent SmartBits System, Справочное руководство

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Chapter 11: ATM Cards
ATM Line Parameters
160 SmartBits System Reference
ATM Line Parameters
Applications
Supported:
SmartWindow, SmartLib.
Card Types:
Applicable to all ATM cards except where specific cards are referenced.
Framing Mode:
Select to define the physical layer of the frame. Possible values for these SmartCards:
•
AT-9025 25 Mbps . Indicates direct cell mapping at 25.6 Mbps.
•
AT-9015 DS1 . Cell maps the ATM cells directly into the DS1 frame with no
intermediate mapping. DS1 PLCP maps the ATM cells into PLCP frames and maps
the PLCP frames into the DS1 frame.
•
AT-9020 E1 . Cell maps the ATM cells directly into the E1 frame with no intermediate
mapping. E1 PLCP maps the ATM cells into PLCP frames and maps the PLCP frames
into the E1 frame.
•
AT-9034B E3 . Cell maps the ATM cells directly into an E3 G.832 frame with no
intermediate mapping. E3 PLCP maps the ATM cells into the PLCP frames and maps
the PLCP frames into an E3 G.751 frame.
•
AT-9045B DS3 . Cell maps the ATM cells directly into the DS3 frame with no
intermediate mapping. DS3 PLCP maps the ATM cells into PLCP frames and maps
the PLCP frames into the DS3 frame.
•
AT-9155C ATM OC-3c . OC3 is for SONET, OC-3c type of optical carrier line.
STM1 enables the European STM 1 framing method (equivalent to OC-3c).
•
AT-9622/9622s ATM OC-12c 622 Mbps :
– OC-12 is for SONET, OC-12c type of optical carrier line. The SmartCard maps
the ATM cells directly into a SONET OC-12c frame.
– STM1 enables the European STM-4 framing method (equivalent to OC-12c). The
SmartCard maps the ATM cells directly into an STM-4 frame.
•
Tx Clock Source . This field does not apply to the AT-9025 SmartCard, which uses
only an internal clock. Specifies the clock against which you want to run the tests.
Possible values:
– Internal – Uses an internally generated clock as the transmit clock.
– Loopback – Uses the recovered (received) clock as the transmit clock.
•
Loopback . Specifies the type of loopback to be used. Possible values:
– Disabled – No loopback is used. This is the normal operating mode of the device.
– Local – Loops the SmartCard's output back to the SmartCard's input.
– Remote – Loops the SmartCard's input back to the SmartCard's output.