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Remote Loopback
The Remote loopback feature only operates in ESF
mode framing format. If ESF mode is optioned,
activating the Remote Loopback switch loops the T1
line of the remote bank. See Description Practice,
Section 61150070L1-2, for details of the loopback
sequence.
Faceplate Indicators
The ACT 2300 LIU has 13 faceplate indicators. The
indicators can be grouped into three categories:
Configuration, Status, and Test. Figure 5 shows
faceplate LEDs and Table 3 describes their meaning.
4. MAINTENANCE
The ACT LIU requires no routine maintenance to
operate properly. In case of equipment malfunction,
use the faceplate test connector and indicators to
determine the trouble source. The faceplate of the
ACT LIU contains the Bantam test jacks for a T1
tester such as a Phoenix 5575 test set.
The MON Bantam test jacks allow a test set to
monitor the T1 data stream without disturbing it. The
FAC Bantam test jacks allow a test set to intercept the
T1 data stream. Figure 4 shows the Bantam test jacks
in the ACT LIU Functional Block Diagram.
Repair services may be obtained by returning the
defective unit to the ADTRAN Repair Department
(see subsection ADTRAN Customer Service).
FAC OUT
Test Jack
DSX-1
T1
RX
PAIR
R1
MON IN
Test Jack
FAC IN
Test Jack
DSX-1
T
TX
PAIR
R
MON OUT
Test Jack
4
DSX-1 Receiver Circuitry
Clock and Data
Recovery
Equalizer
DJAT
DSX-1 Transmitter Circuitry
Local
Loopback
Point
Figure 4. ACT LIU Functional Block Diagram
Section 61150070L1-5, Issue 4
Row A
1 FRM GND
A1
2 CCAIN+
A2
3 CCAIN-
A3
4 +5 V
A4
5 CCBIN+
A5
6 CCBIN-
A6
7 +12 V
A7
8 INCLK
A8
9 GND
A9
10 -48 F
A10
11 RSPV
A11
12 TSPV
A12
13 -48 V
A13
14 YALMA
A14
15 BALMA
A15
16 RALMA
A16
17 YALMB
A17
18 BALMB
A18
19 RALMB
A19
20 TIMCLK
A20
21 GND
A21
22 RFRM
A22
23 RDCLK
A23
24 RPCM
A24
25 GND
A25
26 BCU ALM
A26
27 TREF
A27
28 TFRM
A28
29 TPCM
A29
30 TCLK
A30
31 GND
A31
32 SYSCLK
A32
Figure 3. Connector Pin Assignments
Line Format
Decoder
Line Format
Encoder
Line
Payload
Loopback
Loopback
Point
Point
J27
Row C
65
C1
66 LOCCK+
C2
67 LOCCK-
C3
68
(MAD0)
C4
69 GND (MAD1)
C5
70 GND (MAD2)
C6
71 -12 V
C7
72
C8
73 GND
C9
74 -48 FRT
C10
75
C11
76 RREF
C12
77 -48 VRT
C13
78 FRZ
C14
79 BT
C15
80 BR
C16
81 GND
C17
82 GND
C18
83 BT1
C19
84 BR1
C20
85 GND
C21
86 AT
C22
87 AR
C23
88
C24
89 GND
C25
90 AT1
C26
91 AR1
C27
92
C28
93 RNDIS
C29
94 TKP
C30
95 GND
C31
96
C32
To
RPCM, RCLK,
ACT
RFRM
BCU
To LIU
Controller
From
TPCM, TCLK,
ACT BCU
TFRM
61150070L1-5D
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