Adding or Removing Hardware
294 Installation, Upgrades and Additions for Avaya CMC1 Media Gateways
!
CAUTION:
CAUTION: Always wear an antistatic wrist strap when installing a 120A3A module. Do not
touch the external alarm cable when it is connected to the 120A3A. Static
discharge can damage connector terminals and relays.
To install the 120A3A CSU:
1. Unplug the DS1 circuit pack from its slot.
2. Install a 4C retainer in the 50-pin plug associated with the DS1 circuit pack slot.
3. Plug the 120A3A’s 25-pair connector directly into the plug associated with the DS1 circuit
pack slot.
4. Secure the 4C retainer around the 120A3A.
5. Attach the supplied H700-383 cable to the 120A3A and to the 700A loopback jack.
This cable is directional. To determine the end that connects to the 120A3A, perform a
continuity test between pins 3 and 7. The end with this continuity is the 120A3A end. The
shield is grounded only at the 120A3A end.
Use the cable provided. If cabling other than that provided with the 120A3A is used,
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 120A3A. Ground
the shields of this cable only at the 120A3A end to avoid ground loops .
●Cabling between the network interface and 120A3A can have no bridge taps.
●If using standard house riser cable for connections between the network interface and
the 120A3A, 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 120A3A, 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.
Note:
Note: Avoid mixing wires of different gauges in a DS1 line.
6. If using external alarm equipment, attach the supplied DW8 cable to the 120A3A and the
external equipment. The maximum length of this cable depends on the alarm equipment.
7. If a TN464F/GP/HP or later is used, make sure the circuit pack is set for 24-channel
operation. Set the switch on the circuit pack as shown in Figure 70: TN464HP and
TN2464CP Option Settings on page 161.
8. From the DS1 circuit-pack form of the system administration console, set the line
compensation field to 0-133 ft (40.6 m).