Chapter 3 Operation
3-5
NOTE: For E1 network interface with HDB3 coding or T1 network interface with B8ZS coding all remote DTE
ports with 56 Kbps, all time slots are available for any DS0 assignment, data or voice.
However, for either network interface with AMI coding, user should assign only alternate odd or even DS0
time slots for 64 Kbps data. This is to guarantee one's density requirement.
In addition to setting time slot assignments, the user must also select the signaling format used for each of
the lines and indicate the channel type for each channel. Signaling fcdormat can be CAS (channel
associated signaling) or CCIS (common channel interoffice signaling). In the case of CAS, the E1 format
uses time slot 16 for that purpose, thus this time slot is not available for assignment. The channel type can
be data or voice. In the case of voice, the coding scheme, A-law for E1 and µ-law for T1, will be converted
as well. In addition, for CAS, T1 uses robbed bit signaling while E1 uses time slot 16. This will also be
handled according to ITU rules.
NOTE: Because a time slot from a port with CAS must be assigned to a port also with CAS, user must first
configure the plu-in card for CAS ON or OFF before setting time slot assignment. Also, if the user want to
change a plug-in card CAS setting, all time slots assignments should be remove to avoid sync problems.
NOTE: To avoid certain data entry errors when assigning TSI time slots, the user should first set the affected
time slots to idle. Then assign those time slots. Else, a warning of time slot assignment overwrite will
appear.
Because of the complexity of the TSI Map, the front panel LCD operation would only allow for the display of
the map. To set the TSI Map initially, a VT100 terminal, or a central control using TELNET must be used.
For E1 or T1 card plugged into a slot, each of the 31 or 24 available 64 Kbps time slots can be assigned to
any 64 Kbps time slot of any port. For the FXS card plugged into a slot, each of the two FXS ports can be
assigned to any 64 Kbps time slots of any other E1 or T1 port.
3.13 Alarms and Reports
3.13.1 Alarms
Except for the FXS card, for each other type of plug-in card, Loop-V 4200 series has many types of alarms
as listed in Table 3-2. Also, Loop-V 4200 has alarm queue which record the latest 40 alarms with time stamp.
Loop-V 4200 also has alarm history and alarm status registers which is used to track the alarm count. Each
alarm can be individually enabled or disabled. When disabled, no action is taken. When enabled, alarm
counter increments on the occurrence of the specific type of alarm. When alarm occurs or the counter
threshold exceeds, alarm is triggered.
All alarms are disabled by default.
Individual fault counts are updated every second. Bipolar Violation (BPV) counts are updated every second,
but the BPV alarm is based on an average Bit Error Rate (BER) that is calculated over a 15-minute interval.
Therefore, BPV alarm status is updated every 15 minutes after the average BER is calculated. If the average
BPV rate exceeds the preset threshold i.e., from 10-9 up to 10-5, an alarm can be declared (assuming BPV
alarm is enabled). ES and UAS employ threshold-triggered alarms, but these alarms are declared as soon as
the recorded account exceeds the preset threshold. The 15-minute integration interval does not apply to ES
and UAS alarms. Alarm register states are reset every 15 minutes, but preserved in the Alarm History display.
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