User's Manual

UltraWAVE Micro BTS Installation and Commissioning Guide, Version B 47
Connecting E1 or T1 Trunk Cables
2.6 Connecting E1 or T1 Trunk Cables
External trunk cabling depends on the configuration that the customer ordered
and the site-specific requirements. These cables will be supplied by the customer.
Failure to use electrically compliant T1 or E1 cables may cause transmission
errors. Please refer to the appropriate subsections to determine your cable
requirements.
The E1 or T1 trunk cables are routed directly to the E1 or T1 trunk card in the
Micro subrack assembly. All three types of signaling (E1 75 Ohm, E1 120 Ohm
and T1 100 Ohm) are terminated at the cabinet with RJ-48C port connectors.
2.6.1 E1 Cables
E1-75 Ohm
This is coaxial cable with a nominal impedance of 75 Ohm +/-5% at 1 MHz. The
maximum allowable cable distance depends directly on the insertion loss of the
cable at 1 MHz. In this mode, the E1 trunk card can accommodate up to 6 dB of
cable loss.
E1-120 Ohm
This cable is individually shielded twisted pair with a nominal impedance of
120 Ohm +/-5% at 1 MHz. The maximum allowable cable distance depends
directly on the insertion loss of the cable at 1 MHz. In this mode, the E1 trunk
card can accommodate up to 9 dB of cable loss.
Table 2-10 provides a description of cables required for installation and
connection to an E1 network, but not supplied with the Micro BTS.
Before connecting E1 lines to the Micro BTS, it is assumed that
the quality of the lines has been verified. It is recommended that
Bit Error Ratio (BER) tests are completed to ensure that the BER
is less than 10
-8
.