SB-1203/UGQ (figure 1-7). The SB-1210/UG isintended for use with cryptographic devices; the SB-1203/UGQ is a general-purpose panel.The patch panels are red or black to identify secureand nonsecure information. Red indicates that secure(classified) information is being passed through thepanel. Black indicates that nonsecure (unclassified)information is being passed through the panel.Both panels are also labeled with signs. The redpanel sign has 1-inch-high white block letters that read“RED PATCH PANEL.” The black panel normally hastwo black signs containing l-inch-high white blockletters. One sign reads “BLACK PATCH PANEL” andthe other, “UNCLAS ONLY.”Each panel contains six channels. Each channel hasits own series circuit of looping jacks, set jacks, and arheostat for adjusting line current. The number oflooping and set jacks in each channel varies with thepanel model. Each panel includes a meter and rotaryselector switch for measuring the line current in anychannel.Six miscellaneous jacks are contained in eachpanel. Any teleprinter equipment not regularlyassigned to a channel maybe connected to one of thesejacks. In some instances, commonly used combinationsof equipment are permanently wired together within thepanel (called normal-through).Figure 1-7.—Teleprinter patch panels.1-7
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