ADTRAN 1202011L1, User Manual

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Chapter 2. Installation
2-4 DSU III AR User Manual 61202011L1-1
Network Interface Connection
The DSU III AR has an eight-position modular jack labeled T
ELCO
.
The connector is used for connecting to the network when the unit
is configured for either dedicated or switched operation. The pin
assignments for the telco connector are listed in Table A-1 on page
A-1.
DTE Data Connection/Primary DTE
The primary DTE rate is configured from the front panel. The
primary DTE can operate in asynchronous or synchronous modes
The primary DTE should be connected to either the EIA-232 DTE
connector or the CCITT V.35 DTE connector.
The maximum cable lengths recommended are 50 feet for the EIA-
232. The pin assignments for the primary EIA-232 connector are
shown in Table A-2 on page A-2. The EIA-232 connector works up
to 56 kbps with a low capacitance cable or with the external
transmit clock option selected.
For the CCITT V.35, the maximum cable lengths are 100 feet. The
pin assignments for the V.35 are shown in Table A-3 on page A-3.
The V.35 connector is recommended for use with data rates above
19.2 kbps.
Secondary Channel Connection
If used, the secondary DTE should be connected to the auxiliary
EIA-232 connector. The pinout for the connector is shown in Table
A-4 on page A-4.
To prevent possible radio frequency interference emissions, a shielded ca-
ble is required.