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COMSPHERE 3600 Series Data Service Units
D-18 March 1999 3610-A2-GB41-60
During the backup session, each pair of communicating
DBMs (the DBM-V and its tributary DBM) and the DDS
network are active on the bridge. When the DDS network
is restored, each tributary DSU drops its network alarm.
After the 5-minute restoration interval has elapsed, the
DSU switches back to the DDS network, and the remote
DTE then receives its polls from the host over the DDS
network. Remote DTE responses are also sent back over
the DDS network; this causes the control DSU to raise
LSD, transferring the data from the digital bridge, where
it goes to the host (controlling DTE).
As each tributary disconnects its DBM, its DBM-V
switches out of Data mode, becoming inactive on the
bridge. Thus, restoration to the DDS network is automatic
and generally nondisruptive. (Disruptions should only
occur if the control and tributary are communicating when
the switch occurs.)
Pertinent configuration options for the central-site
bridge and the extended bridge that support the
configuration scenario just described follow. The
configuration options for a DBM-V and a tributary
DSU-DBM are the same as those provided earlier in the
Automatic Partial Backup section (related to Figures D-3
and D-4). Please note that all DBM-Vs here should be
configured the same – only the passwords and telephone
numbers should differ. The same holds true for the
tributary DSU-DBMs.
Configuration Options
Set the central-site bridge configuration options as
follows (Configuration Worksheet for Bridge Mode).
• MUX – Setup
MUX Funct: CBrdg
Bridge Rate: =DSU
Brdg Timing: Int
Share DevA: Enab
Lowest Port#: DCE
# Ports in Gp: 6
Share DevB: Disab
• Prt2 through Prt6
RTS Cntrl: DTE
Elast Stor: Enab
RTS/CTS Del: 0
DTR Alarm: Disab
• DSU
Rate(Kbps): 9.6
TxClkSource: DDS
Msg Clamp: Enab
TxElastStor: Disab
AggrSwitch: Disab
• Diag – DSU
Diag Type: Mixed
2nd Ch(bps): 400
Disr Type: 3600
• Diag – Gen
Position: Cntrl
LinkConfig: M-Pt
Trib TimOut: enter amount of time
M-Pt SymPrt: Disab
• Gen
DTE Port: EIA232