Group /nputs/Outputs. Connection points exist for 5 group inputs/outputs. From these, a maximum
of 2 may be selected for use (2 ports max available). The facing page chart defines which type(s)
of group inputs/outputs (formats) can be accommodated by each port. Listed below the chart are
the possible data rates for each format. As indicated by note 2, group data rates of 1024 and
1152 kb/s require the use of two ports.
The received SG is demultiplexed (recombined) into its composite parts by the demux. Applicable
group data is then switched to its designated port for output to the group, Thus, inputs and outputs
for a given group use the same numbered port.
The conditioned diphase group modem input/output also provides for a combined digital orderwire
to be received/transmitted along with the group data. This combined digital orderwire is available
when group data rate is 256 kb/s and above and includes 16 kb/s of DVOW.
Dedicated User. A 16 kb/s or 32 kb/s dedicated user option is available. If this option is used,
data from the dedicated user is included in the multiplexed output SG. Data will be demultiplexed
from the received SG and routed to the dedicated user.
Orderwires. A 16 kb/s DVOW capability is available and has two operating modes (non-secure
and secure), Mode selection is controlled by the operator. Earth side interfaces are with a H-250
handset, a KY-57/58 Vinson, and a communications nodal control element (CNCE). The CNCE inter-
face is through the combined digital orderwire that is part of the conditioned diphase group modem
input/output. The Vinson and CNCE are secure orderwires.
The term "local" means your TD-1337(V)/G and the term "remote" means TD-1337(V)/G's that are
on the other side of the satellite. Local and remote TD-1337(V)/G's must be in the same orderwire
modes to conduct a conversation. Following is a list of points between which 16 kb/s DVOW con-
versations can be conducted.
Local H-250 handset to H-250 handsets at remote TD-1337(V)/G's
Local Vinson to local CNCE
Local Vinson to Vinsons at remote TD-1337(V)/G's
Local Vinson to CNCE at remote TD-1337(V)/G's
Local CNCE to Vinsons at remote TD-1337(V)/G's
Local CNCE to CNCE at remote TD-1337(V)/G's