H3C Technologies H3C S12500-X Series Switches - Manual (Page 142)

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Engineering labels for DC power cords
These labels are affixed to DC cords that provide power for racks, and the protection grounding cables
including the –48V, PGND, and BGND cables. The labels for DC power cords are affixed to one side of
the identification plates on cable ties.
Table 74 Information on labels affixed to DC power cords
Content Meaning
MN(BC)-–48Vn
• Loaded cabinet side—Only MN is used to identify the cabinet number (row
number and column number in the equipment room).
• Power cabinet side—MN identifies the row and column number of the power
distribution equipment like the control cabinet and distribution box. BC
identifies the row and column number of the –48V connector (if there is no row
number or column number, or the connector can be identified without them,
BC can be omitted). RTN and PGND have no row and column number for
identification.
• n—Power port number in down-top and left-right order, in the range of 1 to 3.
MN(BC)-RTN
MN(BC)-PGND
The label only carries location information about the peer equipment, control cabinet, or distribution box,
while information about the local end is not necessary. Table 74 lists information about two –48V power
supplies on the label. Give information for other DC voltages (such as 24V, 60V) in similar methods.
Make sure labels are affixed in the correct direction. After the cable ties are bundled onto the cable, the
identification plates with the labels must face up, and the text on the labels in the same cabinet must be
in the same direction, as shown in Figure 86 .
Figure 86 Example of labels on a DC power cord
• A01/B08––48V2 (loaded cabinet side)—The power cord is –48V2 DC supply, which is from the 8 th
connector on the second row of –48V bus bar in the cabinet on Row A, and Column 1 in the
equipment room.
• B03––48V2 (distribution box side)—The power cord is –48V2 DC supply, which is from the loaded
cabinet on Row B, Column 03 in the equipment room.
In the power distribution box (or the first power cabinet of a row in the transmission equipment room),
every terminal block on the –48V connector bar has a numeric identification. For example, in the above
label of "A01/B08--48V2", "08" (or sometimes "8") is the numeric identification of the terminal block.
PGND and RTN are two copper bars, on which the terminal blocks are short-circuited, so which terminal
is connected makes no difference. You only need to give the row and column numbers of the power
distribution box, instead of giving the specific serial number of the terminal block on the copper bar. For
example, if the label on the loaded cabinet side is "A01-RTN", it means that the power cord is an RTN