Black Box MT721A-35T Manual De Usuario
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A
4
Links (X.25) Characteristics
Number of Links
3
Data Rate
All the links aggregate up to 2.15 Mbps
Interface
RS-232/V.24, X.21, or V.35 (selected when you order)
Connectors
RS-232/V.24
25-pin D-type, female
X.21
15-pin, female
V.35
34-pin, female
Protocol
Complies with ITU X.25, LAPB (Blue Book, 1988)
Configuration
Clocking
External clocking for receive and transmit paths
Selectable Parameters
Frame window (k); Packet window (w);
Timers (T1, T3, T10, T11, T12, T13) and number of retries (N2);
Allocation of logical channels
Timers (T1, T3, T10, T11, T12, T13) and number of retries (N2);
Allocation of logical channels
Link Level Procedure
LAPB can act as DTE or DCE at layers 2 and 3; Modulo-8,
128 power sequencing; Frame window range 1 through 127
128 power sequencing; Frame window range 1 through 127
Packet Size
Up to 4096 bytes
Throughput
500 packets per second
RAM Size
256, 512, or 1024 KB
Channels
Number
8, 16, or 24
Interface
RS-232/V.24
Connector
RJ-45
Data Rate
75 bps to 38.4 Kbps, programmable
Flow Control
X-ON/X-OFF
Channel Log-on Messages
Herald and bulleting (user-definable)
Command Modes
ITU X.28 and proprietary extensions;
ITU X.29
ITU X.29
Terminal Handling
Enhanced, handling beyond ITU X.3 requirements
1. Specifications