5
Section 61150219L1-5, Issue 1
61150219L1-5A
shield the two inputs. Figure 8 shows timing
connections for a BR1/10 Wall Mount Chassis.
TO DSX-1
P
P
1
SG
T-
O
R-O
T1-I
R1-I
22 BF
JP15
Office Alarms
The backplane connections for the alarm relays are
found on JP15, pins 7 through 10, and are labeled MJ,
MJR, MJV, and MJVR (see Figure 9).
The alarm relay contacts are normally open when the
BR1/10 is functioning properly, and no alarms are
received from the T1 carrier. The alarm relay
contacts will close in the event of a local alarm
condition or the receipt of an alarm from a T1 carrier.
In a carrier alarm condition such as red, yellow, or
blue (Unframed All 1's), several alarm relay contacts
located in the BR1/10 close. Carrier alarm conditions
cause the BR1/10 to go into trunk processing and the
following events will occur:
1. MJ will be directly shorted to MJR
2. MJV will be directly shorted to MJVR
Contacts MJ/MJR can be manually overridden during
an Alarm Condition. The ACO pushbutton on the
BR1/10 PAU faceplate will open the contacts during a
bank alarm condition providing a means to control an
external Audible Alarm. No other alarm contacts are
affected by the ACO pushbutton.
The BR1/10 PAU List 2, P/N 1150078L2, provides
alarm relay contact closure in the event the –48V
PAU faceplate fuse is tripped. In this alarm
condition, the relay contacts will close in the same
manner as if the BR1/10 was in a Carrier alarm
condition, but depressing the ACO pushbutton will
not cancel the audible alarm.
Relay contact closures are a function of the PAU
common unit only, not the chassis. A summarization
of alarm notification is found in Table 2.
TO DF
X-CONN
TO DANTEL
P
24 BH
MJVR
MJV
MJR
MJ
-48V
ALM
Part of JP15
Figure 6. DSX-1 Connections on JP15
Figure 8. Local Composite Clock Wiring for a
Single Chassis
Figure 7. Office Timing Connections on JP15
* This configuration was tested using a
TELECOM SOLUTIONS, DIGITAL
DISTRIBUTOR, DCD 523.
Note 1: Chassis is terminated In (U1 is strapped for In).
Note 2: The ground pin (pin 13 and 16 of JP15) is an optional
connection for shielded cables; it is not required.
1
JP15
U1
OUT
CLK
1
IN
TERM
Chassis 1
*From
BITS
FROM
BITS
CLOCK
MULTIPLE
P
P
P7 (RED)
EU2
LY(OUT)
LX(OUT)
EU1
LY(IN)
LX(IN)
(16)
Part of JP15
Figure 9. Office Alarm Connections on JP15
