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DL3800 DS1 Inverse Multiplexer User Guide—February 1999
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service, execute the manual restore command on the remote unit Þrst. Then
execute the manual restore command on the local unit. Auto restore will
not work for lines removed due to excessive delay.
The DL3800 supports either High Speed Serial Interface (HSSI) or
V.35/RS449 interfaces to the DTE. Extended Superframe (ESF) or D4
framing is supported, as well as AMI or B8ZS line coding. It is compliant
with both AT&T Publication 54016 and ANSI T1.403 Facility Data Link
requirements. For maximum application versatility, the DL3800 is
available for both DSX-1 or Channel Service Unit (CSU) operation.
The DL3800 features an automatic rate fallback in the event of a failing T1
circuit. If the performance of a T1 circuit is detected to be falling below
accepted levels, the DL3800 automatically removes the T1 from service,
and throttles back the DTE to a data rate corresponding to the remaining
T1s. When the alarm condition on the affected T1 has been cleared, the
DL3800 can automatically restore the T1 and data rate.
The user can conÞgure, control, and monitor the DL3800 through the front
panel, an ASCII terminal (locally or remotely via a modem or remotely in-
band) or a Simple Network Management Protocol (SNMP) management
station. The remote DL3800 can be managed in-band using overhead in all
active DS1 connections as the communications path. The DL3800 features
an integrated SNMP agent which supports the DS1 Management
Information Base (MIB) in addition to a unit speciÞc enterprise MIB.
A downloadable software feature of the DL3800 allows new features and
functionality to be added to the unit on line (without interrupting the data)
via the unit's built-in communications port, or via a selected DS1
connection.
DL3800 F
UNCTIONAL
D
ESCRIPTION
The base DL3800 conÞguration consists of a motherboard with two (T1)
network interface connectors and the DTE connectors (HSSI and
V.35/RS449). Six additional T1 network ports can be added with the
addition of from one to three daughterboards, each daughterboard
supporting two additional T1 ports.
The general operation of the DL3800 is explained in the following
paragraphs which describe the signal ßow and overhead functions.
Summary of Contents for DL3800 DS1
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