TDM Interface: Configuring the T1 or E1 Interface

CONFIGURING THE T1 OR E1 INTERFACE

The PmT1 and PmE1 framers have typical configuration settings for operation. The typical operational mode for T1 is:

Transmit/receive ESF mode enabled

Line build-out set to 133 feet/0 dB (DSX-1/CSU applications)

B8ZS encoding enabled

Jitter attenuator enabled

The typical operational mode for E1 is:

HDB3 enabled

CRC4 enabled

CCS mode enabled (time slot 16 is available for use)

Automatic E-bit insertion enabled

Automatic resync enabled

Automatic remote alarm generation enabled

Jitter attenuator enabled

Line build-out set to 120 ohms

Si bits are otherwise managed by the framer device

Error counters change every 500 frames (about once per second). The error count only pertains to the second before the register was polled.

THE T1 FDL INTERFACE

The Facility Data Link (FDL) is the mechanism used by a T1 port to communicate operating statistics. The FDL consists of one bit for every other frame of data, or a 4-KHz serial data port. For most applications the FDL remains inactive waiting for commands. The DS2151Q uses the HDLC protocol to transfer information to and from the FDL.

Note: The Facility Data Link is currently not available for use on the PmT1 due to latency of the MDI interface.

The PmT1 support for the FDL varies depending on the application requirements. Normally the FDL can be accessed via the FDL transmit and receive registers inside the DS2151Q T1 controller. The DS2151Q can be configured to generate interrupts when the receiver goes full, transmitter goes empty, and when a particular pattern is detected at the receiver. Use the SI mode register to set up transmit and receive frame sync delays (0-3 clocks) to mask the F-bit in T1 applications (RFSDA = 1 for DS2151Q and 0 for DS2153Q).

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PmT1 and PmE1 User’s Manual

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Emerson PMT1, PME1 user manual TDM Interface Configuring the T1 or E1 Interface, T1 FDL Interface

PMT1, PME1 specifications

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