Testing; Figure 2. Bantam Jack Monitoring Points; Table 1. Pinout Connectors For Rj-48 T1 Interface; Table 2. Led Indication - ADTRAN 850 Installation And Operation Manual

Access Maximum Number of DS0s that can
Module
FXS 4
FXO 4
*OCU-DP 1
*DSO-DP 1
*U-BRITE 1
*E&M 1
Nx56/64 24
(special slot)
*Supported in TA 850 Q300.
Connections
All TA 850 BCU connections are made through the
backplane connector. With the exception of power and
the V.35 connector, all of the TA 850 rear panel connec-
tors terminate on the BCU. These include Network T1,
Clock source, Alarms, Fractional T1, and Management.
Refer to the TA 850 System Installation and Mainte-
nance Practice, part number 64200376L1- 5A, for addi-
tional information on rear panel connections. Table 1
describes the T1 pinout connections.
Faceplate LED
The faceplate Network LED labeled T1 Network pro-
vides status information for the network T1 using a col-
or coded message format. Refer to Table 2.

4. TESTING

The TA 850 BCU provides a variety of test options for
both the Network T1 and DS0 access modules. The face-
plate of the BCU provides a bantam jack for local T1 test
access. DS0 test access for the digital access modules
(OCU DP, DS0 DP, U-BR1TE) is provided via bantam
jacks on the faceplate of each unit.
Faceplate Bantam Jack
The faceplate bantam jack provides a means to monitor
the network T1 connected to the rear of the TA 850 chas-
sis. The jacks accept standard 310-type bantam plugs.
61200373L1-5B
be used per module
Receiver Circuitry
T1
T1
RX
R1
PAIR
MON IN
Test Jack
T
T1
Equalizer
TX
PAIR R
Transmitter Circuitry
Local
Loopback
MON OUT
Point
Test Jack

Figure 2. Bantam Jack Monitoring Points

Issue 2, August 2001
Figure 2 on page 3 displays where the bantam jacks
monitor the T1.
Faceplate TEST connector
The faceplate DB-9 female TEST connector provides the
necessary clock output required by standard DSO Logic
Test equipment such as a TPI 108/109 test set. Specifi-
cally, the TEST connector outputs 8 kHz and 64 kHz
clock reference signal. Figure 3 on page 5 illustrates the
DB-9 TEST connector.

Table 1. Pinout Connectors for RJ-48 T1 Interface

Pin
1 R1 - RING1
2 T1 - TIP1
3 unused
4 R - RING
5 T - TIP
6, 7, 8 unused

Table 2. LED Indication

LED Condition
OFF
RED
Network
YELLOW
T1
GREEN
FLASHING
GREEN
Clock and Data Line Format
Recovery Decoder
Line Format
DJAT
Encoder
Line Payload/CSU
Loopback Loopback
Point
Name Description
Receive data from
Network DS1
Receive data from
Network DS1
-
Transmit data to Network
DS1
Transmit data to Network
DS1
-
Description
No power.
Unit in Red Alarm (T1
down or not connected.)
Receiving Yellow Alarm
(far end unit in Red
Alarm.)
Normal Operation.
Network T1 in Test.
To
Backplane
From
Backplane
Point
3