ADTRAN 850 specifications Testing

Access	Maximum Number of DS0s that can
Module	be used per 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.

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	Name	Description
1	R1 - RING1	Receive data from
		Network DS1
2	T1 - TIP1	Receive data from
		Network DS1
3	unused	-
4	R - RING	Transmit data to Network
		DS1
5	T - TIP	Transmit data to Network
		DS1
6, 7, 8	unused	-

Table 2. LED Indication

LED	Condition	Description
	OFF	No power.
	RED	Unit in Red Alarm (T1
Network		down or not connected.)
T1	YELLOW	Receiving Yellow Alarm
		(far end unit in Red
		Alarm.)
	GREEN	Normal Operation.
	FLASHING	Network T1 in Test.
	GREEN

		Receiver Circuitry
T1	T1		Clock and Data	Line Format	To
RX
			Recovery	Decoder
PAIR R1					Backplane
	MON IN
	Test Jack
T1	T		DJAT	Line Format	From
TX	Equalizer
PAIR R				Encoder	Backplane
		Transmitter Circuitry
		Local	Line		Payload/CSU
	MON OUT	Loopback	Loopback		Loopback
		Point	Point		Point
	Test Jack

Figure 2. Bantam Jack Monitoring Points

61200373L1-5B Issue 2, August 2001 3