Programming T1 Lines

Additional Feature Information
T1 Lines
Direct Inward Dialing
Primary Rate Interface (PRI)
Tie Lines
Programming for this Feature
Programming Outside Line Type, Access, and Ringing
Programming Caller ID
Programming Tie Lines

Setting Up T1 Lines

1. Set up the T1 basics.

  1. Be sure your T1 PCB is installed and connected, and that your telco is providing T1 service.
  2. Review Programming Outside Line Type, Access, and Ringing to be sure the T1 lines have the correct circuit type and DTMF dialing option.
    Also review the following T1 timers for compatibility with the connected telco.
    • 1631: T1 Incoming Call Timers
    • 1632: T1 Outgoing Call Timers
    • 1641: T1 Ring Detect Timers
    • 1642: T1 Call Control Timers

2. Set the T1 Compatibility Options.

  1. 1213-01: Number of PCM Channels [System: Ports: Slot x: T1/PRI Slot Configuration (1213): Channels]
    Use this option to specify the number of active T1 channels.
    Option Description
    0 [Default] All channels active.
    1-24 The number of active T1 channels.
  2. 1213-02: Clock Control [System: Ports: Slot x: T1/PRI Slot Configuration (1213): Clock]
    Use this option to specify the T1 clock source (internal from the PCB or external from the connected circuit).
    Option Description
    1 [Default] Master (PCB uses its own internal clock).
    2 Slave (PCB uses the clock provided by the connected telco circuit).
  3. 1213-03: Transmit Pulse Amplitude [System: Ports: Slot x: T1/PRI Slot Configuration (1213): Signaling Type]
    Use this option to control the amplitude of the T1 signal transmitted by the PCB.
    • Entries 0-4 correspond to the distance from the T1 PCB to either the telco’s smart jack or your CSU (depending on your installation).
    • Alternately, you can use entries 5-7 which are fixed attenuation entries.
    • It should be helpful to consult with your service provider before changing this entry.
    Option Description
    1 [Default] 0-133 feet (0 dB).
    2 133-266 feet
    3 266-399 feet
    4 399-533 feet
    5 533-655 feet
    6 -7.5 dB
    7 -15 dB
    8 -22.5 dB
  4. 1213-04: Framer Type [System: Ports: Slot x: T1/PRI Slot Configuration (1213): ESF]
    This option sets the T1 framer type.
    • If you disable this option, T1 circuits use D3/D4 (12-Frame Multiframe mode which supports AB signaling bits only).
    • If you enable this option, T1 circuits use ESF (Extended Super Frame) mode. This is a 24-Frame mode which provides ABCD signaling bits and additional diagnostics).
    Option Description
    No (0) Disabled (D3/D4).
    Yes (1) [Default] Enabled (ESF).
  5. 1213-05: Zero Suppression [System: Ports: Slot x: T1/PRI Slot Configuration (1213): B8ZS]
    Use this option to enable or disable zero suppression for the PCB transmit path.
    • If enabled, the PCB uses B8ZS zero suppression.
    • If disabled, the PCB has no transmit zero suppression
    Option Description
    No (0) Disabled (no zero suppression).
    Yes (1) [Default] Enabled (B8Z5 zero suppression).
  6. 1213-06: Loopback Mode [System: Ports: Slot x: T1/PRI Slot Configuration (1213): Loopback]
    Use this option to enable T1 PCB loopback. Although loopbacks are generally used for factory testing, you may find Remote and Payload Loopback helpful for on-site troubleshooting.
    Option Description
    0 [Default] Loopback disabled.
    1 Metallic
    2 Digital
    3 Remote
    4 ST-Bus
    5 Payload

3. Set up the T1 Caller ID Options.

  1. For T1 lines compatible with ANI/DNIS service, review Programming Caller ID
  2. Telco T1 circuits may also provide FSK-based Caller ID. This is programmed as Caller ID Type 1.