LCD Menus and Displays
3–10
ST112 SONET Transmission Test Set
Channel Menus, Receiver
Figure 3–7 Channel Menus, Receiver
Pressing the CHANNEL key will access the LCD menus shown in Figure 3–7. All three menus are
present with VT1.5 mapping, but only the RX STS CHANNEL menu is available with all STS
payload configurations.
The RX STS CHANNEL menu shows how many channels are accessible (1:12 in this example),
which STS Channel is being analyzed (5 in this example), and its STS position (2,2 in this case)
when using the GR-253-CORE numbering format. The STS channel can be changed using the INC,
DEC, and ENTER keys.
The ACTIVE VT CHANNEL menu is used to choose one VT1.5 sub-channel from the chosen
STS Channel. There are twenty-eight (1:28) VT1.5 sub-channels, in this example number nine
(9) is selected.
In the VT CHANNEL MAP menu the virtual tributaries can be mapped sequentially from 1 to 28
or in a 4x7 matrix—in accordance with Bellcore GR-253-CORE (see Figure 3–8 and Table 3–1).
Figure 3–8 VT1.5 Structures
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