ACC Utilities Reference Guide

Chapter 2 59
TTGEN - ZCOM System Table Generator
Creating the TTGEN Configuration File
Optional Parameters
ITBS=n Individual Transmit Buffer Size; where “ITBS” is the
key-word and “n” is the input size. For undisturbed
transmission, an on-chip transmit buffer with a total
size of 64 long words stores the data before formatting
and transmitting. The individual buffer size specifies
the p art of the on-chip transmit buffer allocated to t he
channel. You should assign a value of two words per
timeslot assigned to the subchannel.
The value for ITBS should not exceed 64 for a ny single
port. Note that if all timeslots on a port are assigned,
the maximum value of 2 per slot results in 64.
If the ITBS parameter is not specified, a value of twice
the number of t imeslots for the current subchannel will
be used for the ITBS value.
INV=ON/OFF Inversion; where “INV” is the key-word, “ON” sets
inversion, and “OFF” unsets it. If INV=ON, all data of
the channel transmitted or received is inverted.
ts:n:fm Set timeslot assignment; where “ts” is the key-word
that associates the timeslot with the sub-channel. “fm”
is a FILL MASK which defines which bits of each octet
carry user data. As noted above, T1-SF framing only
allows 7-bits per octet to carry data and for a T1
interface using this type of framing the fill mask is
used to mask off the bit used f or the framing data (the
fill mask would be set to “FEh”). Multiple timeslot
assignment “ts” parameters are permitted for a single
subchannel.