Specifications

10-4 OHSU Ports
Model No.
Running Head
The time slot numbers range from 1 to 24 for T1 links. Figure 10-3 shows the display when
table is selected. Using the space bar to select and deselect the time slot, this example shows
time slots 1 to 5 on WAN 1-1 assigned to port 2. The time slot assignments have to be
contiguous on any port.
Figure 10-3. Typical OHSU Port Time Slot Assignment Screen
Tx CLOCK
The OHSU ports behave as IEEE C37.94 MUX ports so the Transmit Clock (Tx CLOCK)
setting can only be int (internal).
LOCAL LB
The LOCAL Loopback (LOCAL LB) option activates a loopback on the selected port. Choose
the User setting to loop the outgoing data from the external TPE device back to the TPE
receiver. This loopback (see Figure 10-4) allows you to check the local cabling and most of
the optical circuitry in the OHSU port. It also disconnects the incoming data from the far end.
Figure 10-4. Local User Loopback
Choose the net (network) setting to loop the incoming data from the network back toward the
far end. This loopback is shown in Figure 10-5. It tests some of the local OHSU port circuitry,
the local system common ports, the WAN link port, the far-end OHSU port and CPE device,
and the WAN link between the two sites.