8FSU User Manual 61200.130L1-1
Chapter 2. Installation
DCE Connector
The connector labeled DCE provides connection to an external
DSU/CSU. The pinouts for this connector are shown in the
appendix Pinouts.
The connection between the FSU and an external DSU is a direct
connection. When connecting to an external DSU, the FSU emulates
an externally timed DTE interface connected directly to the DCE
interface of the external device.
DTE Connectors
DTE devices are connected to the DTE connectors using either an
RS-232 DTE cable or a CCITT V.35 DTE adapter cable. The
maximum cable lengths recommended are 50 feet for the RS-232
and 100 feet for the CCITT V.35. The pin assignments are listed
in the appendix Pinouts.
The V.35 adapter cable is recommended for use with data rates
above 19.2 kbps. A low capacitance RS-232 cable works up to 56
kbps. The DTE ports are configured through the front panel or
the VT 100 control port. The DTE ports can operate in asynchro-
nous or synchronous modes.
Main Telco Connector
The Main connector is an eight-position modular jack which
provides connection to the dedicated (DDS) network. See the
appendix Pinouts for the Main connector's pin assignments.
Backup Connector
The eight-position modular jack labeled BACKUP is provided to
allow future enhancements to the FSU (dial backup options).
With the dial backup option installed, this connector will pro-
vide connection to the switched telco circuit.