About Installing an ICSU Module
The integrated channel service unit (ICSU) is a combination of a 120A CSU module integrated with a DS1 circuit pack. A 700A DS1 loopback jack must be installed with this device.
See Installing the 120A CSU for step-by-step installation procedures for the 120A CSU.
Check for required components
The ICSU package contains:
- 120A CSU module
- 700A DS1 loopback jack
- Cable H600-383
4-pair modular cord
Group 2, 50-foot (15.2 m) cable (standard)
- Cord DW8A-DE
4-pair modular cord to alarm contacts
- DS1 circuit pack
The basic ICSU requires a TN464E or TN767D or later. The enhanced integrated channel service unit can also be used with the TN2464 or TN2313.
H700-383-Equivalent Cable Guidelines
If using cabling other than the H700-383 provided with the 120A, observe the following guidelines:
- Use 24-gauge wire that provides individually shielded, twisted pairs for transmit and receive signals. Use the cable between the network interface and the 120A. Ground the shields of this cable only at the 120A end to avoid ground loops.
- Cabling between the network interface and 120A can have no bridge taps.
- If using standard house riser cable for connections between the network interface and the 120A, maintain a 100-pair separation between the receive and transmit twisted pairs.
- If using standard house riser cable for connections between the network interface and the 120A, allow no more than 2 cross connects to 110-type cross connect blocks.
- Never use quad cable (untwisted two pair telephone cable) in a DS1 line.
- Avoid mixing wires of different gauges in a DS1 line.
