Specifications

Chapter 1 Installation
1-6
7 Receive Ground
8 Transmit Ground
The maximum cable length for T1 Network (DS1-1) connection is suggested as follows. Reliable T1
cabling distances depend on whether shielded 22 AWG T1 cable (ABAM 600) or unshielded 24 AWG
telephone twisted pair cables are used.
ABAM 600 T1 Cable
T1 Network Port (CSU) 6000 feet
ABAM 600 Cable Specifications:
Nominal Impedance: 100 ohms +/- 5% at 772 kHz.
Insertion Loss: Better than 7 dB per 1000 feet at 1.544 MHz.
Better than 5 dB per 1000 feet at 772 kHz.
Far-End Crosstalk: Better than 85 dB per 1000 feet at 1.544 MHz.
Better than 90 dB per 1000 feet at 772 kHz.
Near-End Crosstalk: Better than 80 dB per 1000 feet at 1.544 MHz.
Better than 85 dB per 1000 feet at 772 kHz.
Signal Wires: 22 AWG solid tinned copper
Drain Wires: 24 AWG solid tinned copper
Shields: Transmit and receive pairs are individually shielded with
24 AWG Unshielded Twisted-Pair Telephone Cable
Transmit and receive pairs are usually run in separate cables to avoid T1 transmit to receive crosstalk in
unshielded cables. Failure to use separate cable bundles for transmit and receive can result in the CSU
LINE port clocking on itself with as little as 10 feet of unterminated telephone cable attached. The CSU
can thus show a normal framed status when the far end of the telephone wiring is actually disconnected
from the T1 demarcation point - due to crosstalk between pairs in the same cable bundle. This is true of
the Access BankTM and all other CSU installations using unshielded twisted pair.
Maximum Access BankTM separation distances when using 24 AWG unshielded twisted-pair cable:
T1 Network Port (CSU) 3600 feet
Carrier Access Corporation Standard T1 Cables
Typical Application Connectors Part Number
Access Bank to Network - 10 feet RJ48C to RJ48C P01575-10
(included with unit)
Access Bank to Network over 10 feet RJ48C to RJ48C P01575-XX