User's Manual

28 UltraWAVE BTS Installation and Commissioning Guide, Release 6.5A
2-5 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 internally from the E1 or T1 trunk card in the baseband subrack
assembly to the top rear of the BTS cabinet. All three types of signaling (E1 75 Ohm, 120 Ohm and T1
100 Ohm) are terminated at the cabinet with RJ-48C port connectors. The pinout of this connector is
illustrated in Figure 2-9.
2-5.1 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 2-8 provides a description of cables required for installation and connection to an E1 network, but
not supplied with the BTS:
Figure 2-9 Cabinet Trunk Port Pinout
1
2
3
4
5
6
8
7
Pin 2: Receive Tip
Pin 1: Receive Ring
IW009301
Pin Numbers
Pin 8: PCB Signal Ground
E1 or T1 Port
Connector
Pin 4: Transmit Ring
Pin 5: Transmit Tip