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Configuring FT1 Services
308648-14.00 Rev 00
8-33
Valid options are:
Mark -- This format uses a 0-bit to indicate a state change and a 1-bit to
indicate no state change.
Space -- This format uses a 1-bit to indicate a state change and a 0-bit to
indicate no state change.
See the NRZI Type parameter on page A-55 for information.
Assigning Timeslots
After configuring logical lines, you configure channels (DS0s) of bandwidth by
grouping 1 to 24 contiguous or noncontiguous DS0 timeslots per DS1 frame.
Allocating DS0s
If you have an FT1/T1 DSU/CSU or E1 module and an ISDN S/T or U module
installed on the same ARN router, you can alternate assigned DS0 channels with
unassigned channels, up to a maximum rate of 512 Kb/s (8 channels).
If you have rates above 512 Kb/s, Nortel Networks recommends that you
configure the DS0 contiguously, even though some noncontiguous channel
configurations may work. If you have an unsupported channel configuration, the
following message appears in the event log:
Connector COM <COM#>, Current timeslot assignment is not supported.
This message indicates an invalid assignment of DS0s for the specified connector;
you should have your service provider change the T1 channel assignments. Using
contiguous channel assignments addresses this problem.
Selecting 56K Rate Adaption on FT1/T1 DSU/CSU Lines
Rate adaption determines the number of bits and their bit positions within a time
slot. The FT1/T1 logical line rate adaption is 64 Kb/s per DS0. You cannot change
this rate.
Caution:
You cannot alternate assigned and unassigned channels across the 24
channels in a T1 line (768 Kb/s).
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