User Guide
Page 21
... an RJ-45 10/100BASE-T data port to connect an Ethernet-capable device, such as a computer, to a 10/100BASE-T hub or another Ethernet device. - The Cisco ATA186-I2 and Cisco ATA188-I2 provide 270 ohm + 750 ohm // 150-nF complex impedance. Note The Cisco ATA186-I1 and Cisco ATA188-I1 provide 600-ohm resistive impedance.
... an RJ-45 10/100BASE-T data port to connect an Ethernet-capable device, such as a computer, to a 10/100BASE-T hub or another Ethernet device. - The Cisco ATA186-I2 and Cisco ATA188-I2 provide 270 ohm + 750 ohm // 150-nF complex impedance. Note The Cisco ATA186-I1 and Cisco ATA188-I1 provide 600-ohm resistive impedance.