7-10
•
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.
Table 7-5 Information on labels affixed to AC power cords
Content
Meaning
MN-AC
MN: Rack number (row number and column number in the equipment room) or the location of
the socket where the power is led in.
The location of the socket is marked according to onsite situation. If the sockets can be
identified by row number and column number, they can be numbered following the same rule
for the rack number. Otherwise, specify the detailed locations to avoid confusing with other
sockets.
The label only carries location information about the peer equipment and the power socket, while
information about the local end is not necessary. 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 7-13 Example of labels on an AC power cord
•
A01-AC (loaded cabinet side)
—The power cord is connected to the socket of Row A and
Column 01 in the equipment room.
•
B01-AC (power socket side)
—The power cord is connected to the loaded cabinet of Row B,
Column 01 in the equipment room.
TO :
A 0 1
A C
TO :
B0 1
A C
