ADTRAN 2 x E1 user manual E1 Interfaces, Tracer System Configuration, Baseband Processor or BBP

61280004L2-1C

Section 1 TRACER Description

E1 Interfaces

The E1 interfaces conform to the ITU G.703 and G.704 electrical and signaling interface recommendations. Two interfacing configurations are allowed - two pair of BNC coaxial connectors or two 15-pin sub-D connectors and RJ48 connectors.

The coaxial connection provides a 75Ω unbalanced connection. The shield of the TX coaxial connection is attached to earth ground. A strap is provided to optionally connect the shield of the RX coaxial connection to ground as described in G.703. The 15 pin sub-D and RJ48 connection provides a 120Ω balanced connection.

TRACER System Configuration

A TRACER system is composed of three major subsystems -- a baseband processor, a radio frequency converter, and an antenna. The following section describes the system components.

Baseband Processor or BBP

The baseband processor or BBP is a 1-U, 515 mm (19-inch) rackmountable unit. This unit provides the system electrical interfaces, user controls and indicators, and performs the spread spectrum processing for the system. The rear panel provides all of the electrical interface points -- E1 interfaces, VT100 compatible terminal, alarm contacts, IF signal, and DC power (from facility or optional AC adapter).

The BBP front and rear panels are illustrated in Figures 1-3and 1-4.

	E1A	E1B	FREQ	SYSTEMTRACER
	ALM	ALM
TEST	LBK	LBK	PLAN A	RF LOW
POWER	CV/CRC	CV/CRC	PLAN B	LINK DOWN
	LOS/OOF	LOS/OOF

Figure 1-3. BBP

RS232

75 OHM	G.703		75 OHM	IF	MAJ	MIN	DC POWER
E1B			E1A
TX	RX	TX		RX
				NO	COM NC	NO COM	NC

Figure 1-4. BBP Rear Panel (75Ω Option)

TRACER 2 X E1 User’s Manual 3