Juniper T1600 Hardware Manual page 195

Copyright © 2010, Juniper Networks, Inc.
SCG/CB/SIB
If 0 is displayed for the SCG/CB/SIB in the Current, Power, and Load fields for a PEM,
and the voltage field does not match the other PEM, it might indicate a difference
between the DC input voltages applied to
power network for unintended voltage drops to the router (see Figure 190 on page 356
for a typical DC source cabling arrangement).
The current sharing between DC power supplies relies on equal voltages at the input
terminals of the power supplies. However, if the voltages do not match, the router
operates normally as long as the DC input voltages are within the operating range
provided in Table 44 on page 349.
For the three-input 240-A DC power supplies, system power is divided into two load
zones. One load zone consists of
consist of INPUT 1 and INPUT 2
two power supplies for each load zone. Therefore, the input voltage for the inputs
in each load zone must be equal in both power supplies for current sharing. For
example, the input voltage for
of PEM1 must be the same for current sharing to occur within that load zone.
For the four-input 240-A DC power supplies, system power is divided into four load
zones. One load zone consists of
consist of ,
INPUT 1 INPUT 2
between the two power supplies for each load zone. Therefore, the input voltage for
the inputs in each load zone must be equal in both power supplies for current sharing.
For example, the input voltage for
of must be the same for current sharing to occur within that load zone.
PEM1
For AC-powered routers, the output is similar to the following:
user@host> show chassis environment pem
PEM 1 status:
State
Temperature
AC Input:
DC Output
FPC 0
FPC 1
FPC 2
FPC 3
FPC 4
FPC 5
FPC 6
Chapter 15: Maintaining T1600 Router Hardware Components
0 0
and
PEM0 PEM1
of and
INPUT 0 PEM0
of PEM0 and PEM1 . Load sharing occurs between the
of and the input voltage for
INPUT 0 PEM0
of and
INPUT 0 PEM0
and of and
INPUT 3 PEM0
of and the input voltage for
INPUT 0 PEM0
Online
33 degrees C / 91 degrees F
OK
Voltage(mV) Current(mA)
55183 7056
55633 7018
55533 5187
55533 7081
55508 6612
55791 7337
55675 2593
0 0
. Consider checking your DC
. The other load zones
PEM1
INPUT 0
. The other load zones
PEM1
. Load sharing occurs
PEM1
INPUT 0
Power(W) Load(%)
389 51
390 52
288 38
393 52
367 48
409 54
144 19
171