7-10
Table 7-4 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.
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 7-12 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 that connects RTN copper bar in the power distribution box on Row A, Column
01 in the equipment room. Give information on the labels for PGND cables in the similar way.
Engineering labels for AC power cords
These labels are affixed to the AC power cords that provide power for cabinets and protection
grounding cables, including POWER, RTN, and PGND cables. The 220 VAC cables and related
PGND and RTN cables are covered with insulating sheath, so the labels only need to contain "AC"
and the cabinet number. The labels for AC power cords are affixed to one side of the identification
plates on cable ties.
