Specifications

Sub Rate Data Ports 8-1
SRU Ports Introduction
Chapter 8
SRU Ports
8.1 Introduction
This chapter provides information regarding the configuration and troubleshooting for the
Low Delay Subrate Data (LD-SRU) ports.
The SRU ports allow you to connect up to 5 RS-232, low-speed and medium-speed (300 kbps
to 38.4 kbps) data terminals to the Integrated Access System. You can multiplex a number of
those devices onto a single DS0 time slot of a WAN port. Each port has delay that is a
maximum 3ms +/- 10% end-to-end of rates 9.6 kbs or higher for sync, and maximum of 6ms
+/-10% end-to-end of rates 9.6 kbs or higher for async.
Each LD-SRU port receives timing from either the external DTE or the Integrated Access
System clock. If the DTE supplies the transmit timing, that clock signal must be synchronized
to the Integrated Access System’s clock source.
Note: Some changes to SRU ports require that the ports be put in standby then the active
modes for the changes to take effect.