$a device = x2700
$d3 "COMPMODROMAN11"
$d4 "COMPMODITALIC11"
$3
$a bold='~'
$a tab = 1,3,10,10,55,77
$a just=1
$a wunder='%'
$a indent = 0
$4
X25 Facilities - $3
$b0$t4 Fast Select;
$b0$t4 Packet and Window size negotiations;
$b0$t4 Call Statistics;
$b0$t4 Permanent Virtual Circuits;
$b0$t4 Call Redirection;
$b0$t4 Reverse Charging.$b1
$4
Access Units - $3$b0
$t4 Bit Rates of 2.4k,4.8k,9.6k,19.2k,48k.$b0
$t4 Physical Level Interfaces - V24/V28, V35, X21.$b0
$t4 HDLC Access Procedure - LAPB conforming to PSS guide part 2.$b0
$t4 Configurable As DTE or DCE.$b0
$t4 Ability of up to 10 Links to Share a Common Address.$b0
$t4 Algorithm used for new call on multi link connection.$b1
$4
Configuration - $3$b0
$t4 Smallest Unit fully configured$b0
$t4 Largest Unit, fully configured$b0
$t4Cost of the above.$b0
$b1$t4 No of Virtual Calls, Total & per Link$b0
$t4 Memory Options$b0
$t4 Max Window size$b0
$t4 Max Packet size$b1
$4
Inter Networking - $b0
$t2 - Gateway Implimentation Of Yellow Book$b0$3
$t4 Conversions TS29 - X29 in both directions with respect to green book.$b0
$t4 Welcome message on X29 call To Gateway.$b0
$t4 Provision of mapping between names and addresses on TS calls.$b0
$t4 Provision of NRS to TS strings on X29 calls.$b0
$t4 Packet and Window size negotiation.$b0
$t4 Accounting, Authorisation, Logging of local/remote addresses.$b1$4
$t2 - Support of multiple DTE addresses per link$b0$3
$t4 Individual addresses$b0
$t4 A range of contiguous addresses$b0
$t4 Any combination of single addresses and ranges$b1
$4
Network Management. $b0
$t2 - Collection of Statistical Data on Each Call$b0$3
$t4 Details of calls in progress.$b0
$t4 Counts Of Packet Types - call, clear, data, interrupt, reset, crc errors.$b0
$t4 Counts cumulative over defined time interval.$b0
$t4 Time interval alterable.$b0
$t4 Reset counts to zero.$b0
$t4 Disable count and trigger alarms when thresholds exceeded.$b0
$t4 Display statistics on local console.$b0
$t4 Store statistics for future retrieval by management centre for analysis.$b1
$4$t2 - Monitor the Performance of the PSE$b0$3
$t4 Ability to use any network terminal (password protected)$b0
$t4 Display status of one, several or all links.$b0
$t4 Total no of calls at any time plus DTE addresses at each end.$b0
$t4 Status changes recorded in a timestamped log.$b0
$t4 Display status changes on local console as they ocurr.$b0
$t4 Store log for future retrieval by management centre for analysis.$b0
$t4 Display total switch performance$b1$4
$n
$t2 - Operator Control Of The Communications System(on running system).$b0$3
$t4 Ability to use any network terminal (password protected).$b0
$t4 Enable/Disable any link.$b0
$t4 Test the status of a link.$b0
$t4 Clear a call to a selected DTE address.$b0
$t4 Change network addresses.$b0
$t4 Change line speeds.$b0
$t4 Change logical channel assignments.$b0
$t4 Change DTE/DCE assignment.$b0
$t4 Available from local console or authorised remote access.$b0
$t4 Modify list of authorised users for gateway.$b0
$t4 A date time-stamp provided with each unsolicited message on console.$b0
$t4 Ability to interrogate and change date and time.$b0
$t4 Date and time recovered automatically after system failure.$b1
Multinode Networks$b0$3
$t4 Ability to operate as part of a multinode network.$b0
$t4 How is it implemented?$b0
$t4 Multinodes should support adaptive routing when preferred route is down.$b0
$t4 Who can control the nodes?$b0
$t4 No difference in facilities available from network in calls through multiple
exchanges.$b1
$4
PSS-compatibility$b0$3
$t4 Committed to maintaining compatibility, H/S interfaces, with PSS.$b1
$4
Existing PSE Compatibility$b0$3
$t4 Connection with GEC & Camtec equipment?$b1
$4
Performance$b0
$t2 - Packet Transmission$b0$3
$t4 Call requests - 50ms (absence of queuing)$b0
$t4 Data Packets  - 10ms (absence of queuing)$b0
$t4 Clear requests- 50ms (absence of queing) including updating charging records
$b1$4
$t2 - Throughput$b1$3
$t4 Smallest Unit Maximum Packet rate.$b0
$t4 Largest Unit Maximum Packet rate.$b1
$4
$t2 - Availability and Reliability$b0$3
$t4 Faulty modules must cause minimum disruptionto servicable modules.$b0
$t4 Not more than 0.01% of valid call requests may result in non establishment.
$b0$t4 Not more than 1 in 10*9 valid packets received must fail to be
transmitted$b0
$t4 Systems failure not more then once every 2000 hours of operation.$b0
$t4 Overload recovery procedures must be initiated automatically.$b0
$t4 Overload must never result in disconnection of users or system failure.$b1
$4
Operation$b0$3
$t4 Must run without operator intervention unless system failure occurs.$b0
$t4 Restart procedures from system failure must be extremely simple.$b0
$t4 Automatic restart from power failure or software failure available.$b0
$t4 Loading PSE from local IPL device.$b0
$t4 Automatic dumping of memory and system restart when inconsitencies met.$b1
$4
Systems Reconfiguration and Enhancement$b0$3
$t4 Tools provided for flexible configuration and enhancement of systems.$b0
$t4 Input should be definitions of config and functions to be performed.$b1
$4
Documentation$b0$3
$t4 Documentation, config details, operating and test instructions provided.$b1
$4
$n
Environment$b0$3
$t4 Capable of working in a normal environment, temp, humidity, dust.$b0
$t4 Operate from standard domestic power supply plus fluctuations.$b0
$t4 No standby power supplies will be provided in event of mains failure.$b0
$t4 Full BT approval for the connection to BT services must be available.$b0
$t4 For a YBTS gateway there must be permission to connect to PSS.$b1
$4
Future Specification$b0$3
$t4 Date for implementation of X.25(1984) or$b0
$t4 - those parts which implement the ISO Network Service.$b0
$t4 Coversion aids such as YBTS to X25 (1984) gateway.$b0
$t4    - either from Manufacturer OR do it ourselves
$b0
$e