Filter
Top Products
Principles of Operation
4-293610-A2-GB41-60 March 1999
• Case 2 – Backing up as many channels as
possible to the one most important tributary
location (Figure 4-22). In this case, the control
DSU and the one tributary DSU selected for dial
backup must be equipped with a DBM configured
with MCMP Backup set to TDM. Essentially, the
backup becomes dial backup of a point-to-point
TDM circuit.
Because the backup is performed in TDM mode,
both TDM and MCMP configuration options must
be set. Therefore, Port 1 at the control DSU should
be mapped to Port 1 at the tributary DSU. For
Case 1, only two DSD groups can be supported
(MCMP mode normally supports three DSD
groups), and the inbound pseudo-carrier control
configuration options (RxCarrSel and TxCarrSel)
need to be set for backup (Cntrl). All other
tributary locations are not served until the alarm is
fixed and the MCMP circuit is restored.
Figure 4-22. Case 2 – Backing Up the Channels to the Most Important Tributary Location