Motorola 326X V.34 ユーザーズマニュアル
Configuring the Modem 4-25
Confi
guring
the Modem
Figure 4-1. Single Channel Point-to-Point Digital Link Restoral (A/B Switch)—Option Set 2
Note the following:
• 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).
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.
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.
configuration (SDC Option Set 2) and operation is the same as with an internal
switch.
Figure 4-2. Single Channel Point-to-Point Digital Link Restoral (A/B Switch)—Option Set 2
35XX
56/64 kbps
PSTN
Router
35XX
Router
To 33.6 kbps
NMS
Network Management Channel
To
56 kbps
56 kbps
326XFAST
SDC
326XFAST
SDC
DSU/CSU
56/64 kbps
PSTN
Router
Router
To 33.6 kbps
NMS
Network Management Channel
A/B
A/B
To 56 kbps
DSU/CSU
326XFAST
SDC
326XFAST
SDC