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1 general, 2 installation, Eneral – Verilink 2000 (34-00182) Product Manual User Manual

Page 5: Introduction

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1

G

ENERAL

Introduction

The TxPORT 2000 CSU (Channel Service Unit) is
an advanced performance monitoring unit
providing an intelligent interface between
customer premises equipment (CPE) and carrier
T1 facilities.

The unit is responsible for providing the proper
electrical interface to the T1 circuit and for
shaping and regenerating the 1.544 Mbps signal.
The CSU monitors transmission for conformance
to the ones density requirements as well as
providing facility performance data, telco status,
alarm reporting, and local/remote testing and fault
diagnosis.

The CSU is equipped with dual register sets that
hold line statistics for both the telco and user. The
unit includes multiple ports for access to statistics,
remote control, configuration, and management. It
provides administration, test, diagnostics and
control over the T1 ESF or D4 network. The unit
also provides AMI/B8ZS and D4 /ESF options in
either T1 direction.

The CSU provides end -to -end in-band protocol
via the ESF facility data link. This allows one
CSU to interrogate and control a remote CSU
(following the 54016 FDL TABS protocol). In
addition, many new request and response FDL
messages have been added to enhance the CSU’s
operation.

The CSU is available as a stand-alone unit or for
use in a multi-unit chassis holding up to 12 CSUs.
The chassis can consolidate the CSU requirements
of an entire network node. All CSUs in a network
may be controlled from a centrally located unit.
Configuration, status, and diagnostic commands
may be issued to all units at the local CSU from
the TxPORT EM8000 Element Manager or the
8100A Site Controller.

Figure 1-1 TxPORT 2000 CSU

STATUS

ACO SW

BV/CR/FE

LOS/OOF

AIS

REM ALM

LOC ALM

S
U
P
V

ACO

N

E

T

D

T

E

T

S

T

LOC

FAR

DENSITY

LLB

PLB

TST

ERR

TO

NET

FRM

NET

MON

MON

TO

DTE

FRM

DTE

PAT SEL

0

1

2

3

4

5 6

7

9

8

T

R

A

N

S

P

O

R

T

®

2000

ESF CSU