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1-13615-A2-GB20-20 December 1996
About Your DualFlow DSU
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DBM Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.32 DBMs 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switched 56 DBMs 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Warranty and Support 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
The COMSPHEREr DualFlow data service unit
(DSU) provides simultaneous digital data service (DDS)
and backup connections to support Frame Relay and
router
-based applications.
The DDS portion provides basic non-rate adapted,
non-diagnostic access using the DSU’
s V
.35 connector.
The backup portion (either a V.32, 4-wire Switched 56, or
2-wire Switched 56 DBM) provides simultaneous
rate-adapted, diagnostic access to the switched network.
T
wo versions are available:
•
The standalone Model DualFlow 3615 DSU is
designed for desktop or shelf operation.
• The carrier-mounted (nest- or rack-mounted)
Model DualFlow 3616 DSU is designed for
operation in the COMSPHERE 3000 Series Carrier.
Each DualFlow DSU is equipped with an integral dial
backup module (DBM) for operation over the Public
Switched Telephone Network (PSTN), often referred to as
the dial network, or the Switched 56
kbps digital service.
The following sections describe the DSU’
s standard
features, as well as the features of the integral DBMs.
Refer to the appropriate section for DBM feature
information.
T
echnical specifications of the DSU and various DBMs
are near the end of this chapter.
Standard Features
The DualFlow DSU offers the following features:
• Multispeed operation. The DSU operates at data
rates of 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64CC kbps
full-duplex over the DDS network.
• Two DTE connectors (interfaces) are provided:
EIA-232-D
and
V.35. Use the EIA-232-D
connector for router-management data or backup;
use the V
.35 connector for user data.
• LADS operation.
The DSU can operate as a local
area data set (LADS) (sometimes called a
limited-distance modem, or LDM) at 2.4, 4.8, 9.6,
19.2, 38.4, 56, or 64 kbps.
• NMS control. The DSU can be controlled by
COMSPHEREr 6700 or 6800 Series NMS. Both
NMSs operate using Advanced Diagnostic protocol
(ADp).
The Model 3615 DSU requires a hubbing device
for connection to the NMS; the Model 3616 DSU is
connected to the NMS through the shared
diagnostic unit (SDU) in the COMSPHEREr
3000 Series Carrier.
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