ACC Utilities Reference Guide

Chapter 2 57
TTGEN - ZCOM System Table Generator
Creating the TTGEN Configuration File
Subchannel-Definition
The Subchannel-Definition section is only used with an E1/T1 ACC card.
In the Subchannel-Definition section, subchannels are associated with
timeslots on an E1 or T1 interface. Subchannels defined in this section
canthenbereferencedinthesection“Terminal-Definition”onpage 60.
The ACC card has 32 subchannels available on each physical E1/T1port.
Timeslot 0 (zero) is used for internal timing by the E1/ T1 hardware, so
timeslots1to31areavailabletobeassociatedwithsubchannelsas
required.
NOTE By convention, subchannel 0 is typically not used in order to reduce
confusion.
T1 Timeslot Configuration
A T1 interface carries 24 timeslots, each with a bandwidth of 6 4k bits per
second. With some types of fram ing (e.g. SF or SuperFrame), one bit of
every octet is used to carry control and timing signals, so the bandwidth
is effectively reduced to 56k bits per second.
The 24 timeslots available are numbered from 1 to 24 and may be
associated with any of the subchannels from 0 to 31, although it is
recommended you only use subchannels 1 to 24. Multiple timeslots may
be combined on a single subchannel.
E1 Timeslot Configuration
An E1 interface carries 32 timeslots, each with a bandwidth of 64k bits
per second. T imeslot 0 is used to carry control and timing signals, so only
timeslots 1 to 31 may be used.
The 31 timeslots available are numbered from 1 to 31 and may be
associated with any of the subchannels from 0 to 31. It is recommended
you restrict your use of subchannels to the range 1 to 31. Multiple
timeslots may be combined on a single subchannel.