Cables and Connectors
T1/PRI interface specifications
MAX 4000 Series Hardware Installation Guide Preliminary November 4, 1998 C-5
Port with internal CSU
If you enable the internal CSU on a T1/PRI port, you can connect the port directly to the
metallic interface of the WAN. To avoid harming the WAN, you must contact your carrier for
approval before installation. Once you install the MAX, you must notify the carrier before
disconnecting the MAX from the WAN. If you disconnect or turn off the MAX without prior
notification, the carrier might temporarily discontinue your T1/PRI service. The MAX unit’s
internal CSUs are compatible with dry-loop T1/PRI lines, and with span-powered or wet-loop
powered T1/PRI lines.
Port without internal CSU
If you disable the internal CSU on a T1/PRI port, you cannot connect directly to the WAN. You
must connect the port to other equipment that provides the interface to the WAN (for example,
an external CSU). Your carrier determines the correct value for the line buildout setting of the
CSU. You configure this parameter during installation. (For detailed information about each
parameter, see the Reference Guide for the MAX.)
Table C-4 lists CSU specifications.
Table C-4.CSU specifications
Information Value
CSU Registration 2CZUSA-74421-DE-N
Critical Circuitry Power Source Dry Loop from local ac power source
Line Capture Frequency 1.544 Mbps +/- 200 bps
Line Code AMI or B8ZS
Line Framing D4 or ESF
Line Input/Output Impedance 100 Ohms +/- 5%
Received Signal Level Range DSX-1 level to -27.5 dB
Transmitted Signal Level DSX-1 level into 100 ohms
Line Buildout 0.0, 7.5, 15.0, or 22.5 dB
Pulse Density and Consecutive
Zeros Enforcement
In accordance with requirements of
AT&T Pub 62411
Line Loopback (LLB) Set Inband
Code
(10000) repeating binary pattern
Line Loopback (LLB) Reset Inband
Code
(100) repeating binary pattern
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