Specifications

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10
10.1 Description
10.1.1 T1 Systems
The DE1 Electrical Transceiver Module provides
the T1 electrical transceivers in a FOCUS chassis.
(Earlier versions of this module were named DS1,
the functionality is the same for both.) It is used
when interfacing FOCUS to other digital commu-
nication equipment, such as T-3 or SONET fiber
optic multiplexers or digital microwave systems.
The module is available with either single or dual
interfaces. The single version has one transceiver,
while the dual version has two transceivers. Dual
transceivers include a programmable feature
permitting the disabling of one of both trans-
ceivers via the FCS. To use the programmable
feature FOCUS firmware must be as follows:
• MV3 ≥ 3.10
• MV5 ≥ 5.0
External telecommunications equipment is
attached to the module’s interface by shielded
twisted pair wires (twisted pair cable) plugged
into the DB15 female or RJ48c connector (see
Figure 10-5). The connection can be for either one
or two transceivers. The module’s DS1 electrical
interface conforms to AT&T Publication 61411.
The maximum line length (DE1) between FOCUS
and the external equipment is 133 feet and for
DS1 it is 50 feet. For longer distances please
contact the factory.
The frame format for this module/interface is
Extended Super Frame (ESF). This enables
matching of the DS0 circuits between FOCUS and
transmission equipment that supports Binary 8
Zero Substitution (B8ZS). The Alarm Indication
Signal (AIS), which is all ones, is also supported.
The AIS is generated by a higher rate multiplexer
if the transmission path is lost.
The DE1 Transceiver Module’s technical specifi-
cations are shown in Table 10-1.
10.1.2 E1 Systems
The DE1 Transceiver Module provides the E1
electrical transceiver in a FOCUS chassis. It is
used when interfacing FOCUS to other digital
communication equipment, such as PDH, or SDH
fiber optic multiplexers or digital microwave
systems. The module is available with either
single or dual interfaces. The single version has
one transceiver pair, and is called SDE1, while the
dual version has two transceiver pairs, and is
called DDE1. Dual transceivers include a
programmable feature permitting the disabling of
one or both transceivers via the FCS. To use the
programmable feature FOCUS firmware must be
as follows;
• MV4 ≥ 4.12
• MV5 ≥ 5.0
External telecommunications equipment is
attached to the module’s interface by shielded
twisted pair wires (twisted pair cable) plugged
into the BNC female connector (see Figure 10-7).
The connection can be for either one to four trans-
ceivers. The module’s DE1 (E1) electrical
interface conforms to CCITT G703.
The maximum line length between FOCUS and
the external equipment is 133 feet (40 meters). For
longer distances, please consult the factory.
The frame format for this module/interface is
Multi-frame. This enables matching of the DS0
circuits between FOCUS and transmission
equipment that supports High Density Bipolar 3
(HDB3). The Alarm Indication Signal (AIS),
which is all ones, is also supported. The AIS is
generated by a higher rate multiplexer if the trans-
mission path is lost.
10. Electrical Transceiver Modules
NOTE
The DE1 transceiver module requires a slight
modification to work with the BNC interface.
The appropriate module is supplied when
using the FOCUS cat. no. option P. If ordering
a spare DE1, you must specify “for use with
BNC”.