33
Maxim Integrated
Evaluates: DS34S132
DS34S132 Evaluation Kit
Table 4-5. T1 Interface Configuration Parameter Descriptions
PARAMETER
DESCRIPTION
POSSIBLE VALUES
Frame Type
Framing mode and operation mode for each
configuration.
Note: Before changing the T1 frame type, you
must close all bundles assigned to the link.
Unframed:
Framer is configured to passthrough mode
and the operation mode is set to unframed.
ESF:
Framer is configured to T1-ESF mode. Operation
mode is set by the robbed bit field to either fractional or
fractional with CAS.
SF:
Framer is configured to T1-SF mode. Operation
mode is set by the robbed bit field to either fractional or
fractional with CAS.
Default: UnFramed
Rx Config Gain
Limit
Determines the maximum attenuation of the
receive signal that can be compensated for by
the T1 link receive path, to obtain the BER per-
formance required by the standards.
Long Haul:
Maximum attenuation of 36dB.
Short Haul:
Maximum attenuation of 10dB. This con-
figuration can actually improve the performance when
operating over relatively short line sections, especially
when operating over multipair cables. In such cables,
significant interference is generated by the signals car-
ried by other pairs, and therefore a weak desired signal
can be masked by the interference.
Default: Short Haul
OOS Code Type
Inserted into unassigned time slots by the sys-
tem at the transmit path towards the T1 equip-
ment. This parameter is not displayed when
the frame type is set to unframed.
OOS Code
: OOS code is sent.
Default: OOS Code
Data TX/RX OOS
[0 - 0xFF]
Can be applied to time slots transmitted
towards the ETH network when loss of signal,
loss of frame, or AIS is detected at the T1 line.
Can also be applied to time slots transmitted
towards the T1 line when a packet receive buf-
fer overrun or underrun occurs. In unframed
mode, voice/data OOS state results in AIS
transmission. This is applied when an LOS
is detected at the T1 line, or when a packet
receive buffer overrun or underrun occurs.
00–FF
Default: 7F
TX/RX OOS Signal
Mask
Out-of-service signaling method. OOS signal
is sent in the Ethernet direction when loss of
signal, loss of frame, or AIS is detected at the
T1 line. The OOS signal is also sent toward the
T1 line when packet receive buffer overrun or
underrun occur.
Space:
Transmitting CAS all 0s, when the Ethernet or
TDM link is down.
Mark:
Transmitting CAS all 1s, when the Ethernet or
TDM link is down.
Space + Mark:
Transmitting all 0s in CAS for the first
2.5s, then switching to all 1s.
Mark + Space:
Transmitting all 1s in CAS for the first
2.5s, then switching to all 0s.
Default: Space