TX-RX gain in Sig MIB Draft
"Kumar, Satish" <[email protected]> Tue, 21 Jun 2005 20:27:10 -0500
| Newsgroups | gmane.ietf.ipcdn |
|---|---|
| Message-ID | <[email protected]> |
Hi,
Question on pktcNcsEndPntConfigTxGain and pktcNcsEndPntConfigRxGain
The MIB description is pasted below. There is no range of values defined
for these MIBs. Setting random values impact the devices badly. It is
good to retsrict these MIBs with specific range values.
pktcNcsEndPntConfigTxGain OBJECT-TYPE
SYNTAX Integer32
UNITS "dB"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This MIB Object represents the per line transmitter (A/D)
gain. A positive number reflects a signal gain, a negative
number reflects a signal loss. This MIB Object may provision
the gain or it may be used to document a non-provisionable
gain between the telco (POTS) a-b (T/R) terminals and the
analog codec maximum PCM coding limit (PCM maximum coding
limit). Based on the default G.711 Vocoder maximum of 3.14
or 3.17 dBm the -4 dB gain default provides Vocoder coding
protection against TE maximum signals while also providing
an initial loss to minimize analog signal echo. "
DEFVAL { -4 }
::= { pktcNcsEndPntConfigEntry 39 }
pktcNcsEndPntConfigRxGain OBJECT-TYPE
SYNTAX Integer32
UNITS "dB"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This MIB Object represents the per line receiver (D/A)
gain. A positive number reflects a signal gain, a negative
number reflects a signal loss. This MIB Object may provision
the gain or it may be used to document a non-provisionable
gain for use with the pktcSigDevToneDbLevel Object to set
the desired level at the a-b (T/R) terminals.
The default values are based on the deployed markets. Some
recommendations are made as follows:
- Based on the default G.711 Vocoder maximum of 3.14 or 3.17
dBm a default value of '-4 dB' provides a maximum analog
signal level at the a-b (T/R) termination point
- Based on [ETSI TS 101 909-4], which provides guidance of
11 dB loss (-11 dB gain), a default value of '-11 dB' is
recommended."
::= { pktcNcsEndPntConfigEntry 40 }
Comments please..!
Thx, Satish