SECTION 61100022L1-5
PAGE 2
(20)
(47)
(1)
(43)
(15)
(51)
(24)
85 mA
To LT
FIGURE 2. U-Repeater Powering Module Application
U
INTERFACE
MDF U-RPM
CURRENT
SOURCE
-
+
REPEATER
POWER
CONVERTER
ISDN
U-REPEATER
D4
POWER
MODULE
MAIN
DISTRIBUTION
FRAME
LT
T
RR1
T1
GND -48 -48 RET
TO
CUSTOMER
12,000 Ft.
26 Gauge
CENTRAL
OFFICE
12,000 ft., 26 Gauge
NOTE: When installed in D4-type compatible channel
banks, the unit dissipates approximately 3 W.
2.0 INSTALLATION
2.01 After unpacking the unit, immediately inspect it
for possible shipping damage. If damage is
discovered, file a claim immediately with the carrier, and
then contact ADTRAN customer service, see Paragraph
5.03.
2.02 The U-RPM plugs directly into any of the 12
channelpositions of the GPC-1 or the 24 channel
positions of the AD4-24 or WECO D4 Channel Bank.
2.03 The U-RPM contains installed option jumpers
for Class A2 (± 80 V) or may be optioned for
Class A3 (0 V to -140 V) operation, using the 22 AWG
jumpers provided with the unit, ADTRAN Part Number:
3336.008.
See Figure 4 for option locations and Table A
for the option settings. The Loop Resistance Fault
indicator illuminates when loop resistance exceeds 1000
Ω or if the loop is open to the Repeater.
2.04 The U-RPM contains a factory replaceable
(3/4 A) Slo Blo fuse on the -48 V line to isolate the
bank in the event of unit failure.
2.05 After installing the U-Repeater System, see
ADTRAN's

U-Repeater Installation/Maintenance

Practice, Section Number, 61150.017-5

. Grasp the U-
RPM by its faceplate and insert it into a channel position.
Push the U-RPM into the backplane connector until
firmly seated.
3.0 CONNECTIONS
3.01 Figure 3 shows the connector pin assignments
of the U-RPM. All connections to the unit are
made via the GPC or D4 compatible backplane. No
additional backplane wiring is necessary for normal
Class of Operation Voltages Used Jumper(s) Installed
Class A2 ± 80 V J1 only
Class A3 0 V to -140 V J2 & J3 only
TABLE A. U-RPM Option Selections