DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures

9-1826UDS1-BD (UDS1 Interface Circuit Pack)

9
Figure 9-110. High Level Overview Of Loopback PointsThe following list of acronym definition s are for the Figure 9-110:

PLB = Payload Loopbac k

BLB = Board Loopback

ELB = Equipment Loopb ack

LLB = Line Loopbac k

RLB = Repeater Loopbac k

CLJ = Loopback Jack Loopback

R-LLB = Remote Line Loopback

SMRT = Sma rt Ja ck

LPBK = Loopback

CPE
LPBK
JACK
NET
SMRT
JACK
CSU
MOD
NET
SMRT
JACK
CPE
LPBK
JACK
DS1
BRD
CSU
MOD
DS1
BRD
NET-
WORK
CSU module to CSU module
Remote end
NETWORK ENVIRONMENT
Local end
NETWORK
SMRT
JACK
BLB
R-LLB
CPE
LPBK
JACK
DS1
BOARD
Remote end loop backs (* CSU or External CSU)
NETWORK
SMRT
JACK
CSU*
MOD
CSU
MOD
CLJ-LB LLB RLB ELB
PLB
CPE
LPBK
JACK
DS1
BOARD
Local end loop backs