High Speed Data Ports 9-1
Chapter 9HSU Ports

9.1 Introduction

This chapter provides information regarding the configuration and troubleshooting for the
IMACS-200 High-Speed Data Ports. The IMACS-200 provides two High-Speed Data ports
which connect via an RS-530 interface DB-25 connector, and employ V.35 standard for
high-speed synchronous data exchange.
The HSU ports allow you to connect high-speed data terminal equipment (DTE) to WAN links
and/or other HSU ports.

9.2 HSU Ports

The IMACS-200 supports two V.35 CPE dev ices. Each port is configured to ope rate as a DCE,
with data speeds set at either 56 or 64 kbps.

CAUTION!

If used in a system using a T1 “Line Code” other than “B8ZS,” HSU card port s assigned to mul tirate
circuits greater than or equal to 4 or more consecutive time slots at 64kbps must have DTE
connected to the port prior to activation. Failure to attach DTE will cause a false carrier alarm.
The IMACS-200 can be used in data applications where the circuit has many timeslots (up t o
24 for T1, and 32 for E1). The transmit and receive clock edges can be individually selected
(refer to Tx and Rx CLOCK PLRTY descriptions later in this chapter).