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COMSPHERE 3550 Series Data Service Units
1-6 February 1995 3550-A2-GB20-10
Table 1-2
DSU Technical Specifications
Specifications Criteria
APPLICATION Full- or half-duplex data transmission via point-to-point or multipoint
DDS network, or local area data channel
COMMUNICATION LINE Leased or private 4-wire DDS line
DATA RATES
Digital Services (DDS, ASDS)
LADS
When timing is external (provided by the
DTE), the DTE’s clock must be within these
ranges.
2.4, 4.8, 9.6, 19.2, 38.4, and 56 kbps
2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 kbps
64 kbps 11 bps
56 kbps 9 bps
38.4 kbps 4 bps
19.2 kbps 5 bps
9.6 kbps 1 bps
4.8 kbps 0 bps
2.4 kbps 0 bps
DDS NETWORK INTERFACE
3550 DSU
3551 DSU
8-pin modular jack, USOC RJ48S
(One or two) 50-pin connector, USOC RJ48T
DIAGNOSTIC INTERFACE
3550 DSU
3551 DSU
Requires 3600 Series Hubbing Device which provides
two 8-pin modular jacks
Via the SDU in the COMSPHERE 3000 Series Carrier
NETWORK COMPATIBILITY
AT&T Technical Reference 62310 – 1987
Integrated Network Corporation
Compatibility Bulletin CB-INC-101, and
Pacific Bell publications
PUB L-780035-PB/NB and
PUB L-780036-PB/NB
2.4, 4.8, 9.6, and 56 kbps
19.2 kbps loop at levels of +6, 0, or –10 dBm
DSU COMPATIBILITY
Primary Channel
All AT&T Paradyne digital products and other products that are
compliant with AT&T Technical Reference 62310 – 1987