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T1/PRI Cabling
22 Interphase Corporation
T1/PRI Cabling
WARNING
Before connecting the cable, read Telephone Lines
Unsafe Voltages in the Safety Precautions section at the
front of this manual.
The cable between the adapter and the carrier or the CSU must
meet standard T1 attenuation and transmission requirements:
• 100 Ohm
• two twisted pairs, category 3 or higher
• maximum length: 655 feet (200 m) without a CSU,
6200 feet (1800 meters) with a CSU.
The actual cable length between the adapter and the carrier
must be measured and recorded; you will need this information
The cable must include an RJ48C plug at the end dedicated to
the WAN adapter. It must also provide the appropriate plug or
cabling system at the end connected to the carrier or CSU. See
Connector Pinouts on page 24 and relevant carrier or CSU
documentation for more information.
T1 Link Requirements
The adapter and the CSU must be configured with several
common specifications in order to interoperate. The adapter’s
T1 parameters are set to the following:
• Line coding: B8ZS
• Frame format: ESF (Extended Super Frame)
• Line I/O impedance: 100 Ohm ± 5%