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Nokia Network Voyager for IPSO 4.0 Reference Guide 93
Use T1 framing to divide the data stream into 64Kbps channels and to synchronize with the
remote CSU/DSU. This setting must match the frame format used by the CSU/DSU at the
other end of the point-to-point link.
8. Click Apply.
9. Click 64bps or 56bps in the T1 Channel Speed field to select the DS0 channel speed for the
T1 line.
Some older trunk lines use the least-significant bit of each DS0 channel in a T1 frame for
switching-equipment signaling. T1 frames designed for data transfer can be set to not use the
least-significant bit of each DS0 channel. This setting allows data to be sent over these trunk
lines without corruption but at a reduced throughput. This mode is called the 56 Kbps mode
because each DS0 channel now has an effective throughput of 56 Kbps instead of 64 Kbps.
All T1 functions still work in the 56 Kbps mode, including all framing modes and fractional
T1 configurations.
10. If you selected Extended SF as the T1 Framing format, click ANSI or None in the FDL Type
field to select the FDL type.
11. Click Frame relay in the Encapsulation field.
12. Click Apply.
13. Enter a number in the Keepalive text box to configure the frame relay keepalive interval.
This value sets the interval, in seconds, between keepalive protocol message transmissions.
These messages are used periodically to test for an active remote system.
Note
This value must be identical to the keepalive value configured on the system at the other
end of a point-to-point link, or the link state fluctuates.
14. Click Apply.
15. Click DTE or DCE in the Interface Type field.
DTE is the usual operating mode when the device is connected to a Frame Relay switch.
16. Click On or Off in the Active Status Monitor field.
Sets the monitoring of the connection-active status in the LMI status message.
17. Click Apply.
18. (Optional) Click Advanced T1 CSU/DSU Options link to select advanced T1 options.
The T1 CSU/DSU Advanced Options page allows you to configure fractional T1 channels,
line build-out values and other advanced settings for the T1 device. The values you enter on
this page depend the subscription provided by your service provider.
19. From the Advanced T1 CSU/DSU Options page, click Up to return to the physical interface
page.
20. (Optional) Click the Advanced Frame Relay Options link to go to the Frame Relay
Advanced Options page.