User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 5-9
Electrical Installation and Cabling
High-Speed DS3 Cables
High-Speed DS3 Cables
DS3 connections require 75 ohm coaxial cable with tinned copper shield. Use 735A or 1735A or
equivalent cable for lengths up to 250 feet, and 728A or 734A cable for lengths up to 450 feet.
1. Connect the Primary DS3 Input to
Primary IN.
2. Connect the Primary DS3 Output to
Primary OUT.
3. Connect the Secondary DS3 Input to
Secondary IN.
4. Connect the Secondary DS3 Output to
Secondary OUT.
Figure 5-6 Connecting the DS3 and Clock Cables
External Clock Cable
The Wide Bank 28 DS3 is designed to accept a high-speed 44.736 Mbps external clock source for
certain applications. The external clock cable must be a shielded coax terminated with a BNC
connector. (See DS3 cable requirements above.) Connect it to
Ext. Clock on the Wide Bank. For
technical specifications, see DS3 Transmit Clock Source on page 3-5.
External Clock Input
Primary HIGH SPEED IN
Secondary HIGH SPEED IN
Secondary HIGH SPEED OUT
Primary HIGH SPEED OUT