Motorola 3260FAST User Manual page 88

Router
Figure 4-1. Single Channel Point-to-Point Digital Link Restoral (A/B Switch)—Option Set 2
Note the following:
Figure 4-2 shows a configuration using an external A/B switch. Network
configuration (SDC Option Set 2) and operation is the same as with an internal
switch.
Router
Figure 4-2. Single Channel Point-to-Point Digital Link Restoral (A/B Switch)—Option Set 2
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To 33.6 kbps
326XFAST
SDC
To
56 kbps
35XX
• With SDC Option Set 2 selected (for Motorola and non-Motorola DSU/CSUs),
the DSUs' restoral configuration should be set to Timing=Internal.
• In this case, the 326XFAST-SDC DTE Rate must be set to a constant rate as
provided by the network (defaults of 56/64 kbps).
• Enable Option Set 2 in both the local and remote modems, and ensure that
*
Mode (AT SM) is set the same in both modems.
• The SDC modem supports single channel environments only. For example, the
SDC modem can restore Port 1 only of the 35XX device.
• The 35XX device, when initiating restoral, must be set to Normal mode (as the
35XX network management channel is virtually a time division multiplexed
data stream which cannot be compressed with the SDC product).
• The SDC modem may have the ARS feature enabled. In this case, ARS
determines the link rate.
To 33.6 kbps
To 56 kbps
326XFAST
A/B
SDC
DSU/CSU
NMS
PSTN
326XFAST
56/64 kbps
NMS
Network Management Channel
PSTN
326XFAST
56/64 kbps
DSU/CSU
Network Management Channel
SDC
Router
35XX
A/B
SDC
Router
Configuring the Modem 4-25