4
Section 61150070L1-5, Issue 4
61150070L1-5D
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
A32
1 FRM GND
2 CCAIN+
3 CCAIN-
4 +5 V
5 CCBIN+
6 CCBIN-
7 +12 V
8 INCLK
9 GND
10 -48 F
11 RSPV
12 TSPV
13 -48 V
14 YALMA
15 BALMA
16 RALMA
17 YALMB
18 BALMB
19 RALMB
20 TIMCLK
21 GND
22 RFRM
23 RDCLK
24 RPCM
25 GND
26 BCU ALM
27 TREF
28 TFRM
29 TPCM
30 TCLK
31 GND
32 SYSCLK
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C24
C25
C26
C27
C28
C29
C30
C31
C32
65
66 LOCCK+
67 LOCCK-
68 (MAD0)
69 GND (MAD1)
70 GND (MAD2)
71 -12 V
72
73 GND
74 -48 FRT
75
76 RREF
77 -48 VRT
78 FRZ
79 BT
80 BR
81 GND
82 GND
83 BT1
84 BR1
85 GND
86 AT
87 AR
88
89 GND
90 AT1
91 AR1
92
93 RNDIS
94 TKP
95 GND
96
J27
Row C
Row A
Figure 3. Connector Pin Assignments
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).
Figure 4. ACT LIU Functional Block Diagram
Clock and Data
Recovery
MON IN
Test Jack
DSX-1
RX
PAIR
FAC OUT
Test Jack
Line Format
Decoder
To
ACT
BCU
To LIU
Controller
RPCM, RCLK,
RFRM
DSX-1 Receiver Circuitry
DSX-1 Transmitter Circuitry
MON OUT
Test Jack
Local
Loopback
Point
DSX-1
TX
PAIR
FAC IN
Test Jack
From
ACT BCU
Line
Loopback
Point
Payload
Loopback
Point
TPCM, TCLK,
TFRM
Equalizer
Line Format
Encoder
DJAT
T1
R1
T
R
