Verilink 2100 (34-00187) Product Manual - Manual (Page 5)

General 1-1 2100 CSU
1. General
Introduction
TxPORT’s 2100 CSU (channel service unit) is an advanced
frame transparent unit providing an interface between the
customer premises equipment (CPE) and the carrier T1
facilities. The unit is compatible with all T1 carrier trans-
mission equipment and is designed to comply with all
industry standard CSU specifications. The 2100 CSU is
responsible for providing the proper electrical interface to
the T1 circuit and for shaping and regenerating the 1.544
Mbps signal.
The CSU works with any T1 line format and is line code
transparent to unframed, D4, and ESF framing formats.
Optionally, the CSU provides AMI/B8ZS conversion from
the DTE to the facility and B8ZS/AMI conversion from the
facility to the DTE. The unit monitors transmission for bipo-
lar violations and maintains the pulse density of the
transmitted signal.
The CSU’s front panel has features which aid in quick fault
isolation. Eleven LED indicators display status, alarm, and
test conditions. A DIP switch allows for the quick configu-
ration of operation and test parameters. Test jacks allow
bridged monitoring of the passed signal and signal insertion
toward the network or the DTE. A test switch activates local
and remote loops and controls the internal BERT generator
and comparator.
Power options for the CSU include line or local -24/-48
VDC power. Sealing current can be provided for dry spans.
Network and DTE connections are made through RJ-48C
jacks.
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. Power supplies are available from TxPORT to meet
any requirement, including full redundancy.
Features
• Available as a stand-alone unit or a nest mounted unit
• Transparent to framing; supports ESF or D4 framing
• AMI or B8ZS line coding; B8ZS transparency
• Front panel test access jacks and test switch
• Complete diagnostic capabilities including loopbacks and
built-in BERT
• Selectable alarms with alarm indicators and optional alarm
relay contacts
• Selectable facility ALBO levels and DTE DSX levels
• Selectable sealing current source
• Line or local -48 VDC powering
Figure 1-1 TxPORT 2100 CSU
LOC FAR
ACO SW
ACO
FRM
NET
MON
TO
DTE
TO
NET
MON
FRM
DTE
LOOP
BPV
LOS
AIS
DENSITY
SET
RESET
ERR
7
6
5
4
3
2
1
S2
2100
CSU
T R A N S P O R T
®