ADTRAN TSU 610 User Manual page 39

Chapter 2. Installation
Slot 1
Slot 1 is used as the source of DTE timing when the DTE
timing mode is selected or as the source of UBR1TE timing
when the UBR1TE timing mode is selected. If DTE timing is
desired, the DTE interface port sourcing the timing must be
connected to Slot 1. This slot will accept all other interface
types except Secondary Network interface option modules,
including DSX-1 (PBX), the Full Drop and Insert (D&I)
network interface, or the multiport Dial Backup (DBU).
Slot 2
Slot 2 is used for the multiport Dial Backup module if it is
installed. This slot accepts all other interface types except
Secondary Network interface option modules, including
DSX-1 (PBX) and the Full Drop and Insert (D&I) network
interface.
Slots 3-5
Slots 3-5 will accept any interface type except secondary
interface, the interface for DTE timing, or the multiport DBU.
If other interfaces have any restriction on their location, this
will be specified in the individual option card manual
(provided with the option cards).
Slot 6
Slot 6 services any option module type including secondary
network interface ports (DSX-1 (PBX) and Full D&I), but not
the DTE timing source. If a secondary network interface port
is to be used, it must be installed in slot 6.
You can use NxDBU modules in any slot.
61200610L2-1 TSU 610 User Manual 2-9