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Introduction 33
Model 3088 Series User Manual 2 • Configuration
- External: The serial interface provides the clock for the DSL interface (V.35, X.21). It must be set to DTE
for the X.21 interface.
- Receive Recover: The 3088 recovers the clock from the DSL interface and provides it to the serial/T1/
E1 interface.
• Data Rate: Both the serial/T1/E1 and DSL data rates are set by specifying the number of 64k timeslots.
• Pass Framing: Must be enabled for T1. For E1, the entire TS0 time slot is passed. When E1 is configured
for CAS (Multiframe), the entire TS0 time slot and all of TS16 are both passed.
• Pass Alarms: When Passed Framing is enabled, the alarms are always passed, even if Pass Alarms is disabled.
When Passed Framing is disabled, you can pass alarms by enabling Pass Alarms.
• Rx Equalizer: This can be enabled to remove distortion introduced in the T1/E1 cable.
• Line Type: The following framing formats are available:
- T1-Unframed: Pass Framing must be enabled.
- T1-SF: Superframe (D4) framing.
- T1-ESF: Extended superframe.
- E1-Unframed: G.703 Clear Channel
- E1-Fractional: G.703/G.704 fractional.
- E1-CRC: Includes CRC multiframe.
- E1-Multiframe: Includes channel associated signalling (CAS).
- E1-CRC & Multiframe: Includes CRC and CAS multiframe.
• Line Code: The following line codes are available:
- AMI: Alternate Mark Inversion.
- HDB3: High Density Bipolar 3 (E1 only).
- B8ZS: Bit 8 Zero Substitution (T1 only).
• Line Build Out: The following line build outs are available:
- Pulse-75 (E1 only)
- Pulse-120 (E1 only)
- 0.0 dB (T1 only)
- -7.5 dB (T1 only)
- -15.0 dB (T1 only)
- -22.5 dB (T1 only)
• Annex: Either G.991.2 Annex A or Annex B.
• DSL Error Monitor Max Interval Errors: The number of errors allowed in an interval before considering
the interval errored. A value of ‘0’ disables the DSL error monitor.
• DSL Error Monitor Interval Time: The length in seconds of an interval.