XRT83VSH38 データシートの表示（PDF） - Exar Corporation

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XRT83VSH38

8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

Exar Corporation 

REV. 1.0.7

FUNCTIONAL DESCRIPTION

XRT83VSH38

8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

The XRT83VSH38 is a fully integrated 8-channel short-haul line interface unit (LIU) that operates from a 1.8V

and a 3.3V power supply. Using internal termination, the LIU provides one bill of materials to operate in T1, E1,

or J1 mode with minimum external components. The LIU features are programmed through a standard

microprocessor interface or controlled through Hardware mode. EXAR’s LIU has patented high impedance

circuits that allow the transmitter outputs and receiver inputs to be high impedance when experiencing a power

failure or when the LIU is powered off. Key design features within the LIU optimize 1:1 or 1+1 redundancy and

non-intrusive monitoring applications to ensure reliability without using relays. The on-chip clock synthesizer

generates T1/E1/J1 clock rates from a selectable external clock frequency and outputs a clock reference of the

line rate chosen. Additional features include RLOS, a 16-bit LCV counter for each channel, AIS, QRSS

generation/detection, Network Loop Code generation/detection, TAOS, DMO, and diagnostic loopback modes.

1.0 HARDWARE MODE VS HOST MODE

The LIU supports a parallel or serial microprocessor interface (Host mode) for programming the internal

features, or a Hardware mode that can be used to configure the device.

1.1 Feature Differences in Hardware Mode

Some features within the Hardware mode are not supported on a per channel basis. The differences between

Hardware mode and Host mode are descibed below in Table 1.

TABLE 1: DIFFERENCES BETWEEN HARDWARE MODE AND HOST MODE

FEATURE

HOST MODE

HARDWARE MODE

Tx Test Patterns

Fully Supported

QRSS diagnostic patterns are not available in Hardware mode.

The TAOS feature is available.

RxRES[1:0]

Per Channel

In Hardware mode, RxRES[1:0] is a global setting that applies to

all channels.

TERSEL[1:0]

Per Channel

In Hardware mode, TERSEL[1:0] is a global setting that applies to

all channels.

EQC[4:0]

Per Channel

In Hardware mode, the EQC[4:0] is a global setting that applies to

all channels.

NOTE: In Host mode, all channels have to operate at one line rate

T1 or E1, however each channel can have an individual

line build out.

Dual Loopback

Fully Supported

In Hardware mode, dual loopback mode is not supported.

Remote, Analog local, and digital loopback modes are available.

JASEL[1:0]

Per Channel

In Hardware mode, the jitter attenuator selection is a global setting

that applies to all channels.

RxTSEL

Per Channel

In Hardware mode, the receive termination select is a global set-

ting that applies to all channels.

TxTSEL

Per Channel

In Hardware mode, the transmit termination select is a global set-

ting that applies to all channels.

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