Yealink SIP-T54S Administrator's Manual page 44

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
EXP20
Physical Features:
- Rich visual experience with 160 x 320 graphic LCD
- 20 physical keys each with a dual-color LED
20 additional keys through page switch
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- Daisy-chain 6 modules up to 120 physical keys
Expansion module (≤2) is powered by the host phone
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2*RJ-12 (6P6C) ports for data in and out
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18