COMSPHERE 3600 Series Data Service Units
1-6 March 1999 3610-A2-GB41-60
Models
The 3600 Series DSUs are available in two models:
•Model 3610 is a standalone desktop unit.
•Model 3611 is a circuit card for installation in a
COMSPHERE 3000 Series Carrier.
NOTE

Except

where specifically noted,
all features and capabilities of the
3600 Series DSUs with the TDM
or MCMP option discussed in this
applications guide apply equally
to both models. However, the two
models are not interchangeable.

Model 3610 with TDM or MCMP

The housing of the Model 3610 DSU with TDM or
MCMP has an expanded base which is designed to
accommodate both the DSU circuit card and the TDM or
MCMP circuit card (Figure 1-1).
The TDM or MCMP circuit card provides up to five
additional 25-pin EIA-232 interface connectors (ports) on
the rear of the housing. These ports, together with the
DSU’s EIA-232-D/V.24 interface connector (Port 1),
provide for 2-port or 6-port multiplexing or digital
sharing.
A Model 3610 DSU with TDM/Flex or MCMP/Flex
may be a 2- or 6-port version. You can configure each
port independently to operate as either an EIA-232 or
V.35 interface. Ports are configured via the DCP, an async
terminal, or an NMS. When a port other than Port 1 is
used for V.35 operation, a cable adapter is required
(feature number 3000-F1-510).
When the TDM/DSD or MCMP/DSD (EIA-232/V.35)
is installed, you can select either EIA-232 or V.35
interface compatibility for Ports 2 through 6 by changing
the option card.

Model 3611 with TDM or MCMP

The Model 3611 DSU with TDM or MCMP consists of
a Model 3611 circuit card and a TDM or MCMP circuit
card that are physically connected (Figure 1-2). As a unit,
they fill two adjacent slots in the COMSPHERE 3000
Series Carrier.
There are two types of Model 3611 TDM or MCMP
circuit cards: non-modular and modular.
The non-modular TDM or MCMP provides a single
multiport interface connector mounted directly onto the
rear of the TDM or MCMP circuit card. The EIA-232-D/
V.24 or V.35 interface connector at the rear of the DSU is
Port 1; the TDM or MCMP multiport interface connector
provides five additional EIA-232 ports (2 through 6). A
special multiport cable fans out from the single multiport
interface connector to five individual EIA 25-pin DTE
connectors. Together with the Port 1 interface connector,
the multiport cable provides for 6-port multiplexing or
digital sharing.
The modular TDM or MCMP contains “gold finger”
contacts on the rear edge of the circuit card and is used
with the 6-port connector module that contains six DB25
connectors. There is one connector for each port and a
multiport cable is not needed. The 6-port connector
module also provides a 26-pin high-density D-type
connector for a V.35 interface for Port 1 and is located at
the top of the module. This connector requires a 6-port
V.35 Interconnect Cable that must be ordered separately.
The non-modular TDM or MCMP can be installed on a
non-modular or modular DSU, while the modular TDM or
MCMP can only be installed on a modular DSU. With the
non-modular TDM or MCMP, the DTE cables must be
removed before removing the DSU-TDM or DSU-MCMP
unit from the carrier. However, with the modular TDM or
MCMP, you can remove the DSU-TDM or DSU-MCMP
unit from the from of the carrier without disconnecting the
DTE cables from the rear of the carrier.
Low voltage ac power from the carrier’s backplane is
provided to the TDM or MCMP circuit card, and a power
supply on the TDM or MCMP circuit card produces the
regulated dc operating voltage.

Models 3610 and 3611 with

SNA Diagnostic Interface

The Models 3610 and 3611 with the SNA Diagnostic
Interface or LPDA-2 consist of a firmware upgrade that
allows the DSU to be controlled by NetView. A 3600
Series DSU can be ordered from the factory with this
option installed. This option can be also be field installed
by your Customer Support representative or upgraded by
Factory Service.