ADTRAN Total Reach DDS Circuit Diagram Features, Options, 10dB, TRDDS-R Option Switch, Wiring

	Channel Bank
			Customer Premises
			or Outside Plant	4-Wire Customer
	TR	2-Wire Loop		Interface
T-Carrier			TRDDS-R
	OCU			DSU/CSU
	DP	T/R Pair		Up to
				18 kft or -45 dB

Figure 2. Total Reach DDS Circuit Diagram

Features

¥Two-wire deployment

¥Repeaterless operation

¥Bridged tap tolerant

¥Span-powered

¥Auto-rate adaption on subrates, 19.2 and 56 kbps rates, including secondary channel, and 64 kbps clear channel capability

¥LED indicators for Power, SYNC, NEAR/FAR CRC, Service Rate, and Loopback

¥T200 mechanics

¥Signal-level indication during synchronization

¥Automatic data pass-thru upon detection of bidirectional central Office (CO) loopback at power-up

¥Extended range on customer interface up to 18 kft or -45 dB

¥Sealing Current of 12 mA on the four-wire customer interface

With -130 Vdc, ADTRANÕs TRDDS system is in the A3 Class as specified in Bellcore TR-NWT-001089, Standard for Electrical Safety for Network Telecommunications Equipment.

2. OPTIONS

Rate is automatically configured from the Total Reach dataport unit. Options are selected using the SW1 switch as illustrated in Figure 3.

When 0 dB (SW1-1) is selected, the unit will transmit a 0 dB AMI signal across the four-wire interface toward the customer DSU/CSU. When -10 dB is selected, the unit will transmit a -10 dB AMI signal toward the DSU/CSU.

0dB	N O	-10dB
	1

SW1

Figure 3. TRDDS-R Option Switch

3. INSTALLATION

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

After unpacking the unit, immediately inspect it for possible shipping damage. If damage is discovered, file a claim immediately with the carrier, and then contact ADTRAN Customer and Product Service (CAPS). See Section 6, Warranty and Customer Service.

CAUTION

Never install telephone wiring during a lightning storm.

Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.

Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.

Total Reach dataports normally provide -130 V of span-powering voltage to the TRDDS-R.

Wiring

For indoor applications, the TRDDS-R can be housed in a standard T400/T200 shelf or the ADTRAN T400/ T200 Single Mount Housing, part number 1212007L1. The ADTRAN T400/T200 single environmental housing, part number 1150087L1, is recommended for outside plant applications. Connections are made using screwdown terminals on the barrier strip located on the housing. Frame ground is presented on pins 1, 11, 17, and 27 to accommodate various T400/T200 mountings. Figure 4 describes the circuit card pinout and Table 1 shows the wiring connections for the TRDDS-R for both inside and outside mounting applications.

Page 2 Section 61291021L5-5A, Issue 1 61291021L5-5A