Connecting to the Interface
To install or repair your inside wiring at the Telephone Modem (MTA):
Before working on your phone lines, please read and understand the CAUTIONS.
- Refer to -"MTA Layout" for details on the different telephone modem models and their layouts.

Making Connections Directly to a Telephone:
- Standard Single Line Telephones:
- Connect one end of the telephone base cord to one of the telephone ports on the back of the Telephony Modem.
- Jacks A (Tel Line 1/2), B (Tel Line 2), C (Tel Line 3/4) or D (Tel Line 4) as shown in the Rear Panel image above.
- Connect the other end to the telephone.
- Connect one end of the telephone base cord to one of the telephone ports on the back of the Telephony Modem.
- Multi-line Telephones:
- 2 or 4 line phones using two separate lines on a single RJ-14 base cord.
- plug it into the port labeled “Tel 1/2” or “Tel3/4”.
- 2 line phones capable of using separate RJ-14 base cords for each line.
- This connection type will allow ease of troubleshooting.
- Base cords can be moved to test the modem ports.
- Base cords can be moved to test the telephone's line jacks/ports.
- This connection type will allow ease of troubleshooting.
- 4 Line phones.
- Plug 1st base cord into jack 1/2 on the phone and port labeled “Tel 1/2” on the Telephone Modem (MTA).
- Plug 2nd base cord into jack 3/4 on the phone and port labeled “Tel 3/4” on the Telephone Modem (MTA).
- 2 or 4 line phones using two separate lines on a single RJ-14 base cord.
Making Connections to the Customer Owned Wiring:
- It is recommended to contact a qualified electrician to make the proper connections to the customer owned wiring.
- When connecting to a Telephone System or PBX, please contact the system vendor to make the proper connections.
- Connecting inside wiring to a Jack.
- It is recommended to use 1 jack for each telephone line being connected for ease of troubleshooting.
- Connecting to a Telephone Block.
- A Specialized punch tool is required for connecting telephone wires to a block.
- Using any other tool like a screw driver will damage the block.
Wire Types and Colors:
4 wire cable
- green wire to green terminal
- red wire to red terminal
- black wire to green terminal - for second line if used
- yellow wire to red terminal - for second line if used
8 wire and 12 wire cables
- white/blue to green terminal
- blue/white to red terminal
- white/orange to green terminal- for second line if used
- orange/white to red terminal- for second line if used