ADTRAN 750 specifications Pinout Connectors for RJ-48 T1 Interface, LED Indication, Testing

Table 3. 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 4. LED Indication

LED	Condition	Description
	Off:	No power.
	Red:	Unit in Red Alarm (T1
Network		down or not connected).
	Yellow:	Receiving Yellow Alarm
T1
		(far end unit in Red alarm).
	Green:	Normal Operation.
	Flashing Green:	Network T1 in Test.

4. TESTING

The TA 750 BCU provides a variety of test options for both the Network T1 and DS0 access modules. The faceplate 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 750 chassis. The jacks accept standard 310-type bantam plugs. Figure 2 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 DS0 Logic Test equipment such as a TPI 108/109 test set. Specifically, the TEST connector outputs 8 kHz and

64 kHz clock reference signal. Figure 3 illustrates the DB-9 TEST connector.

DS0 test equipment is used to test DS0 access modules such as the OCU DP, DS0 DP, or U-BR1TE. Once the test equipment is connected to the reference clock source, individual tests can be performed on DS0 access modules using the faceplate bantam jacks on each unit.

		Receiver Circuitry
T1	T1		Clock and Data	Line Format	To
RX
			Recovery	Decoder
PAIR R1					Backplane
	MON IN
	Test Jack
T1	T			Line Format	From
TX	Equalizer		DJAT
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

4 Section 61175012L1-5, Issue 4 61175012L1-5D