CHAPTER 1: Specifications
7
Composite Interface
Type —
RS-232 (CCITT V.24/V.28) serial
synchronous, internal/external clocking; full-
duplex interfaces to support optional V.35,
RS-530, RS-449, and X.21 standards
Connector —
DB25 female
Configured as —
DCE
Speeds (bps) —
7200, 9600, 14,400, 19,200,
38,400, 56,000, 64,000, 72,000
NOTE: The Multiserver 500 will not operate with
clock rates, internal or external, other than
those specified above.
Data-Channel Interface
Number of Channels —
1
Type —
RS-232 (CCITT V.24/V.28) serial
synchronous/asynchronous, full-duplex
interfaces to support optional V.35, RS-530, RS-
449 and X.21 standards.
Connector —
DB25 female connector
Configured as —
DCE
Sync Channel Data Rates —
1200 bps to
72,000 bps
Sync-Channel Bandwidth Allocation —
Fixed rate
or dynamic rate
Fixed Rate:
Always operates at guaranteed rate
Dynamic Rate:
Operates at either a maximum
configured rate or guaranteed configured rate,
depending on voice/fax activity and DBA
configuration
Dynamic Rate
Switching Status —
On-hook/off-hook, or
idle/active voice/fax traffic
Maximum Rate —
Composite rate minus
overhead
Async Channel
Data Rates —
1200 bps to 57,600 bps
Data Bits —
7 or 8 data bits plus 1 parity bit
Parity —
Space, mark, even, odd, none
Stop Bits —
1, 1.5, and 2 per character
Flow Control —
RTS/CTS and X-ON/X-OFF;
must be configured the same way at each end
EIA Controls: —
4 full-duplex control signals
supported
Voice/Fax Channel
Interface Types —
E&M, FXS, or FXO, depending
on the type of voice/fax interface card installed
Digitizing Rates —
Fixed rates of 4000, 4800,
6400, 7200, 8000, 9600, 12,000, 12,800, 14,400,
and 16,000. The voice/fax channel is
automatically assigned the highest fixed rate
within the available bandwidth. Available
bandwidth equals composite rate minus
guaranteed sync channel rate minus overhead.
Overhead is 400 bps for composite rates of less
than 56 Kbps, and 800 bps for composite rates
of 56 Kbps and above.
Specifications for Voice/Fax Modules —
See
Appendixes A, B,
and
C
Command Port Interface
Type —
RS-232 (CCITT V.24/V.28) serial
asynchronous
Connector —
8-position modular jack wired as RJ-
1D DCE
Speeds —
1200 bps to 19,200 bps
Data Bits —
7 or 8 data bits plus 1 parity bit
Parity —
Space, mark, even, odd, none
1. Specifications