User`s manual

The Digi SYNC/570i-56 is a high-performance expansion board for ISA or Micro Channel computers. This two port card
includes an integrated CSU/ DSU function for one port and a jumper configurable V.35/EIA-232 interface for the second
port. Each board assembly and connector package is supplied with all the hardware and software needed for a complete
board installation.
The Hitachi HD64570 Serial Communications Adapter (SCA) provides a highly-integrated advanced communications
subsystem for the SYNC/570i-56. It further maximizes synchronous communications performance by using protocol-
specific features to minimize driver overhead.
The onboard memory of the SYNC/570i-56 is directly addressable by both the system and the SCA’s DMA. Program-
initiated DMA transfers operate at DMA/memory speed independent of other system activity. This architecture provides low
system overhead and high performance.
The SYNC/570i-56 V.35 port communicates at T1/E1 line speeds up to 2.5 Mbps. Each HD64570 chip supports two
synchronous/asynchronous ports and four channels of DMA as well as interrupt and timer logic.
The CSU/DSU supports Clear Channel 64K, Leased Line 56K and Switched 56K service. In addition to providing Digital
Data Service (DDS) operation, the SYNC/570i-56 can serve as a limited distance modem providing full-duplex synchronous
communications over privately owned 4-wire, unloaded, twisted pair cable. The CSU/DSU Telco interface is a standard RJ-
45 8-pin jack. The V.35/EIA-232 port is a standard DB-25 connector.
The optional OEM software lock ensures that OEM software will operate only with OEM-supplied boards.
SYNC/570i-56 includes SurgeBlock™, which is designed to protect the board and the computer in which it is installed
against damage from data line surges.
Multiple SYNC/570i-56 ISA boards may share a common memory window. Micro Channel boards may share a common
interrupt request line.
CSU/DSU Features
• AT&T Specification 62310 compliance
• AT Command Set configurable
• Switched 56K or leased line configurable
• Clear Channel 64K
• LED indicators for
No Signal/Out of Service
Test Mode
TXD/RXD
• Configurable CSU/DSU status control lines
• V.54 remote loopback
• Surge and power cross protection
V.35/EIA-232 Port Features
• Independent operation from CSU/DSU port
• Hardware selectable
• V.35 serial data rates up to 2.5Mbits/second
• EIA-232 serial data rates up to 150Kbits/second
• Transient surge protection
Specifications:
Power Requirements: 458mA @ +5 VDC ± 5%
Switched 56K CSU/DSU 34mA @ -5 VDC ± 5%
24mA @ +12 VDC ± 5%