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Chapter 3: Connecting to the Line
5536 PRI RAS Communications Controller Users Guide 31
T1/PRI Cabling Requirements
The cable between the board and the carrier or the CSU must
meet the following standard T1 attenuation and transmission
requirements:
• 100 Ohms
• Two twisted pairs, category 3 or higher
• Maximum length: 655 feet (200 m) without a CSU, or
6200 feet (1800 meters) with a CSU
Measure and record the actual cable length between the board
and the carrier or the CSU. You will need this information
when you configure the line profile parameters.
The cable must include an RJ48C plug at the end dedicated to
the WAN board. It must also provide the appropriate plug or
cabling system at the end connected to the carrier or CSU. See
Connector Pinouts on page 34 and relevant carrier or CSU
documentation for more information.
T1 Link Requirements
If the board connects to the T1/PRI line, the board and CSU
must be configured with several common parameters to
interoperate. The board’s T1 parameters are set as follows:
• Line coding: B8ZS
• Frame format: ESF (Extended Super Frame)
• Line I/O impedance: 100 Ohm ± 5%