Motorola 49901 Instruction Manual - Page 42

Clocking Limitations, Vanguard 34x DCE INT --> VG6560/VG320/VG64xx EXT at 1.5 Mbps

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Page 42 highlights

Target Applications Clocking Limitations Clocking Limitations Vanguard 34x Listed below are the clocking issues relating to Port 3 of the Vanguard 34x: Vanguard 34x DCE INT --> VG6560/VG320/VG64xx EXT at 1.5 Mbps When a Vanguard 34x Port 3 is configured as internally clocked and is connected to a 6560/320/64xx which is configured as EXT clocked, and the Vanguard 34x internal clock is configured at 1.5 Mbps, the link has clock slippage and CRC errors. Workaround: Configure the VG6560/VG320/VG64xx port "Invert TX Clock" to YES. Vanguard 34x DCE INT --> VG6560 SDB2 EXT When a Vanguard 34x Port 3 is configured as internally clocked and is connected to a SDB2 card on a Vanguard 6560 which is configured as EXT clocked, the link will not come up. Workaround: Configure the Vanguard 6560 SDB2 port as INT clocked and the Vanguard 34x as EXT clocked. Connect the ports with a crossover cable. The DIM on the Vanguard 6560 SDB2 port should be in the DCE position. Vanguard 34x DCE EXTLP --> VG6560 SDB2 or SDB INT When a Vanguard 34x Port 3 is configured as EXTLP clocked and is connected to a SDB2 or SDB card in a Vanguard 6560, the link will not come up. Workaround: Configure the Vanguard 6560 SDB2 or SDB port as INT clocked and the Vanguard 34x as EXTLP clocked. Connect the ports with crossover cable. The DIM on the Vanguard 6560 SDB2 or SDB port should be in the DCE position. In general, configuring a DTE device as Internally clocked or a DCE device as externally clocked or EXTLP are not recommended configurations. 1-22 About the Vanguard 340 and 340 Enhanced

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1-22
About the Vanguard 340 and 340 Enhanced
Target Applications
Clocking Limitations
Clocking
Limitations
Vanguard 34x
Listed below are the clocking issues relating to Port 3 of the Vanguard 34x:
Vanguard 34x DCE INT --> VG6560/VG320/VG64xx EXT at 1.5 Mbps
When a Vanguard 34x Port 3 is configured as internally clocked and is connected to
a 6560/320/64xx which is configured as EXT clocked, and the Vanguard 34x internal
clock is configured at 1.5 Mbps, the link has clock slippage and CRC errors.
Workaround:
Configure the VG6560/VG320/VG64xx port "Invert TX Clock" to
YES.
Vanguard 34x DCE INT --> VG6560 SDB2 EXT
When a Vanguard 34x Port 3 is configured as internally clocked and is connected to
a SDB2 card on a Vanguard 6560 which is configured as EXT clocked, the link will
not come up.
Workaround:
Configure the Vanguard 6560 SDB2 port as INT clocked
and the Vanguard 34x as EXT clocked. Connect the ports with a crossover cable. The
DIM on the Vanguard 6560 SDB2 port should be in the DCE position.
Vanguard 34x DCE EXTLP --> VG6560 SDB2 or SDB INT
When a Vanguard 34x Port 3 is configured as EXTLP clocked and is connected to a
SDB2 or SDB card in a Vanguard 6560, the link will not come up.
Workaround:
Configure the Vanguard 6560 SDB2 or SDB port as INT clocked and
the Vanguard 34x as EXTLP clocked. Connect the ports with crossover cable. The
DIM on the Vanguard 6560 SDB2 or SDB port should be in the DCE position.
In general, configuring a DTE device as Internally clocked or a DCE device as
externally clocked or EXTLP are not recommended configurations.